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Model 3900S - Spectra

1. Ma High S E Reflector Pump Mg Fold Beam Dump Figure 3 3 Folded four mirror cavity with longitudinal pumping High Reflector Pump Focus Argon 1111 UU UZ Laser Pump Dye Stream N Laser Output Fold Output Tuning Coupler Element Mirror Figure 3 4 Typical three mirror cavity used in a CW dye laser The pump illumination in the Ti sapphire laser must be collinear to the cav ity mode over a relatively long length of laser rod If the typical three mir ror cavity used in dye lasers Figure 3 4 were used with Ti sapphire the pump and cavity modes would overlap at one of the fold mirrors and would make laser alignment difficult In the Model 3900S an additional colli mated leg is used and the remaining pump beam is dumped through one of the fold mirrors The resulting cavity is easy to align Model 3900S CW Ti sapphire Laser Astigmatic Correction and Pumping Birefringent Filter Using a focusing mirror at an angle other than normal incidence leads to astigmatism unless corrected by some other element e g the Brewster angle Ti sapphire rod Folded cavities in which this astigmatism is not eliminated yield oval shaped output beams that are difficult to focus By a careful choice of the cavity fold angles and rod length astigmatism in the output beam can be completely eliminated But because astigmatism still exists within the laser rod the pump beam must also be astigmatic to allow efficient coupl
2. Spectra Physics KK West Regional Office Nishi honmachi Solar Building 3 1 43 Nishi honmachi Nishi ku Osaka 550 0005 Telephone 81 6 4390 6770 Fax 81 6 4390 2760 e mail niwamuro O splasers co jp United Kingdom Telephone 44 1442 258100 United States and Export Countries Spectra Physics 1330 Terra Bella Avenue Mountain View CA 94043 Telephone 800 456 2552 Service or 800 SPL LASER Sales or 800 775 5273 Sales or 650 961 2550 Operator Fax 650 964 3584 e mail service O splasers com sales O splasers com Internet www spectra physics com And all European and Middle Eastern countries not included on this list And all non European or Middle Eastern countries not included on this list 9 3 Model 3900S CW Ti sapphire Laser Appendix A Danger W Material Safety Data Sheets MSDS This section contains scanned copies of material safety data sheets MSDS that are supplied by the vendor and cover the various chemicals and com pounds used in the Tsunami laser system 1 e the compounds used in the filters in the Model 3910 filter purge unit Read the MSDS sheets carefully before handling or disposing of filter elements They may contain hazardous chemicals Spectra Physics has not independently determined the accuracy of the Material Safety Data Sheets which were developed by the manufacturer of each chemical therefore we do not warrant the information contained therein Disp
3. cc eee ee eens 2 8 Sources for Additional Information LL 2 9 Laser Safety Standards ow Aerer Cow ee eae NONG EEA LS Pe SEA ee ES eee as 2 9 EQUIPMENtana rag apakan NA oS Ee OEA AAA 2 10 Chapter 3 Laser Description ees 3 1 Ti sapphire as a Laser Medium 3 1 FOUkcMirorFolded CAVI parle EE pie ae ho Rake HA Ae hee AA 3 2 Astigmatic Correction and Pumping o 3 4 DICCHINGSREFINGI sinti ie a i AE RE AE A 3 4 Tuning Characteristics of the CW Treappbrelaser 0 a 3 4 OPCS SEIS sti Ree et Kat ila iui e ia od ebe a le ce hohe et ebe 3 5 PUMPING ODIONS sais Sane a oP Ses Sake doe ale i ed Ree ete wee ES eee eae ad 3 5 Vil Model 3900S CW Ti sapphire Laser Chapter 4 Installation and Alignment a 4 1 Controls and COnneCulOns sx a DAA DAN Ee EE rer i 4 1 Model 3900S Laser Head penises nave dis add A ack nde ERA See ee ae ee 4 1 Model 3910 Purge Unit Controls 4 3 Jee e BEE 4 4 Installing ne PUMP Las aaa aa bee eet Ree SEE cee We rea e 4 4 Installing the Model 3900S Ti sapphire Laser 4 5 Installing the Optional Model 3910 Regulator Filter Purge Un 4 6 Removing the Purge Line from the Laser Head and Model 3910 4 7 Cavity Tel TE EE 4 7 Aligning the Mirrors and Rod WEE 4 7 Adjusting the Birefringent Filter 4 12 Chapter 5 Narrow Linewidth Options ee 5 1 AIM ET AION ASSOMIONV 00 at ts and nice ang kaa a e Bad Baa eee ANG dak ar ar
4. Figure 4 9 Wavelength Calibration Chart 4 13 Figure 4 10 Optional Wavelength Calibration Chart 4 13 Figure 5 1 Model 3900S Mirror Mount and Control Locations including Etalon Assembly Options 5 3 Figure 5 2 Model 3900S with Etalon Assembly Options 5 3 Figure 5 3 Etalon Mount Assembly with M8 Modification 5 4 Figure 6 1 Transmittance vs Wavelength for Oxygen and Water Vapor aana 6 2 Figure 7 1 Cleaning the Mirror Surface cc eee eee eens 7 4 Figure 7 2 Lens Tissue Folded for Cleaning o o ooo cece eee eee ee eens 7 4 Figure 7 3 Underside of the Model 3910 showing filter assembly placement and orientation 7 8 List of Tables Table 2 1 Label Translations lt lt maaga tide ceeds Ose ha ES e om bees A ee Eee ceed 2 6 Table 3 1 Model 3900S Specifications LL 3 6 Table 8 1 Replacement Parts Standard Model 3900S Optics 8 2 Table 8 2 Model 3900S Optic Sets ocra PALAD 69446000250 NGA DAA wt Ee 8 2 Table 8 3 Model 3900S Accessories and Replacement Parts 8 3 Een ee EE 8 3 Model 3900S CW Ti sapphire Laser Danger Laser Radiation Danger Danger Warning Warning ESD h Caution Don t Touch Eyewear Required Y W Y Y Y A S N Warning Conventions The following warnings are used throughout this manual to draw your attention to situations or procedures that require extra attention They warn of hazards to your health dam
5. Whenever possible clean the optic using the drop and drag method Figure 7 1 a Hold the optic horizontal with its coated surface up Place a sheet of lens tissue over it and squeeze a drop or two of acetone or meth anol onto it b Slowly draw the tissue across the surface to remove dissolved con taminants and to dry the surface Pull the tissue slow enough so the solvent evaporation front imme diately follows the tissue 1 e the solvent dries only after leaving the optic surface 7 3 Model 3900S CW Ti sapphire Laser Figure 7 1 Cleaning the Mirror Surface Tissue in Hemostat 3 For stubborn contaminants and to access hard to reach places such as the windows use a tissue in a hemostat to clean the optic a Fold apiece of tissue in half repeatedly until you have a pad about 1 cm 0 5 in square and clamp it in a plastic hemostat Figure 7 2 Don t While folding do not touch the surface of the tissue that will contact the Touch Y optic or you will contaminate the solvent Sc Figure 7 2 Lens Tissue Folded for Cleaning b If required cut the paper with a solvent cleaned tool to allow access to the optic c Saturate the tissue with acetone or methanol shake off the excess resaturate and shake again d Wipe the surface in a single motion Be careful that the hemostat does not touch the optic surface or the coating may be scratched 4 After placing the optic you just cleaned into th
6. k micro 10 qu atto 10 a xiii Unpacking and Inspection Unpacking Your Laser Warning W Your laser was packed with great care and its containers inspected prior to shipment It left Spectra Physics in good condition Upon receiving your laser immediately inspect the outside of the shipping containers If there 1s any major damage holes in the containers or cracked wooden frame mem bers insist that a representative of the carrier be present when you unpack the contents Carefully inspect your laser as you unpack it If you notice any damage such as dents or scratches on the cover or broken knobs immediately notify the carrier and your Spectra Physics sales representative Keep the shipping containers If you file a damage claim you may need the containers to demonstrate that the damage occurred as a result of shipping If you need to return the laser for service these specially designed crates assure adequate protection Spectra Physics considers itself responsible for the safety reliability and performance of the Model 39008 only under the following condi tions e All field installable options modifications or repairs are performed by persons trained and authorized by Spectra Physics e The equipment is used only according to instructions provided in this manual System Components Accessory Kit e Model 3900S laser head e Model 3910 nitrogen purge unit optional Included with the laser system is
7. ment Parts for specifications and part numbers Enclose the pump beam with beam tubes to avoid accidental exposure Installation and Alignment Model 3900S cw Ti sapphire Laser Layout A Layout B Figure 4 5 Typical system layout for Model 3900S and pump laser 7 Close the pump laser shutter This completes the installation of the pump laser Installing the Model 3900S Ti sapphire Laser 1 Place the Ti sapphire laser on the table as shown in Figure 4 5 2 Remove the top cover and raise the interlock shutter lever to the over ride up position 3 From inside the Model 39005 use a 2 32 in Allen wrench to adjust the feet so the base plate of the laser is level with the table and the center of the input aperture is at the level of the pump beam Open the shutter of the pump laser 5 Position the Model 3900S so that the pump beam passes unobstructed through the center of both the input aperture and the input alignment aperture striking the approximate center of mirrors M M and M Figure 4 2 6 Close the intracavity shutter on the pump laser 7 Secure the Model 3900S to the table with foot clamps provided The clamps slide over the lower portion of each foot 8 Attach two cooling lines to the fittings on the side of the laser Figure 4 3 then attach one of the tubes to a filtered water supply and the remaining tube to a drain Since the ion laser also requires a consider able water cooling supply
8. output power as dyes degrade Ti sapphire solid state lasers eliminate much of the effort normally required to operate dye lasers in the near infrared System Components e Model 3900S laser head e Model 3910 nitrogen purge unit optional Figure 1 1 The Model 3900S Ti sapphire Laser 1 1 Model 3900S CW Ti sapphire Laser Patents Chapter 2 Danger W Danger Laser Radiation Laser Safety The Spectra Physics Model 39008 and 1ts pump laser are Class IV High Power Lasers whose beams are by definition safety and fire hazards Take precautions to prevent accidental exposure to both direct and reflected beams Diffuse as well as specular reflections can cause severe eye or skin damage Because the Model 3900S laser emits cw infrared radiation it 1s extremely dangerous to the eye Infrared radiation passes easily through the cornea which focuses it on the retina where it can cause instanta neous permanent damage Precautions for the Safe Operation of Class IV High Power Lasers Eyewear SE pa Required a Wear protective eyewear at all times selection depends on the wave length and intensity of the radiation the conditions of use and the visual function required Protective eyewear vendors are listed in the Laser Focus World Lasers and Optronics and Photonics Spectra buyer s guides Consult the ANSI or ACGIH standards listed at the end of this section for guidance Maintain a high ambient light leve
9. 4 8 Adjust Me Place the white card over the aperture of M Some of the pump beam will be reflected from M toward M Although the pump beam will not follow exactly the same path as the cavity mode this small blue spot can be used as a reference Center this spot on the aperture of Mg by adjusting Mg 4 9 Model 3900 CW Ti sapphire Laser 4 10 Note Figure 4 8 The fluorescence spot as it appears on mirror M A pair of argon goggles laser goggles or glasses opaque to argon laser wavelengths is an ideal tool for this adjustment as this will make the residual pump beam appear faint while making the fluorescence from the Ti sapphire more obvious The fluorescence from the Ti sapphire rod will appear more diffuse at Mg than it will at M but the adjustment technique is the same as it was for Ms 10 Set the birefringent filter Adjust the operating wavelength of the birefringent filter to correspond to 800 nm If the orientation of the filter has not been changed since factory installation this position should correspond to about 4 8 on its micrometer vernier Figure 4 3 The blue dot on the outside edge of the filter should align with the setscrew on the filter adjustment Adjust Msg Place the white card over the aperture to M Adjust Mg to center a small fluorescent dot on the aperture This fluorescent spot can be seen with the naked eye by many people However if the pump power is rather low or your visu
10. This requires performing the complete alignment procedure as des cribed in Chapter 4 Installation and Alignment Cavity Alignment Symptom Low Output Power Possible Causes Corrective Action Low pump power Optics are dirty Check the pump laser output power and TEM mode Clean optics using the procedure described in Maintenance in the fol lowing order 1 Rod surfaces Birefringent filter outside surfaces only Mg M7 Mg Ms Brewster windows M and M without removing the optic 9 As a last resort remove and clean M and M This will necessitate a full realignment Adjust M and Mg for maximum output power after each stage of cleaning IS Model 3900S CW Ti sapphire Laser Symptom Low Output Power Possible Causes Corrective Action Cavity optics are out of alignment Rod position are not optimized Pump focus mirror M out of position Adjust mirrors M and Mg as described in Chapter 4 Installation and Alignment Cavity Alignment Adjust the rod position as described in Chapter 4 Installation and Alignment Cavity Alignment Do not forget to release the lock down screws before adjustment Unless the position of M has been moved since installation this adjust ment should not be necessary However if the Model 3900S is used with a pump laser that has a beam divergence differing greatly from the recommended Spectra Physics argon ion lasers M can be
11. To prevent condensation of the surface of the rod do not circulate cooling water when the laser is off Operation Tuning with the Birefringent Filter Optics Selection Changing Mirrors Use an infrared viewer and a monochromator when tuning the Model 3900S Center the output of the Model 3900S on the input slit of the mono chromator and set the wavelength of the monochromator to the desired operating wavelength Use the micrometer adjustment to tune the laser to within the resolution of the monochromator If you wish to change the operating wavelength range you will need to change both the optics set and the order of the birefringent filter Five mirror sets and wavelength operating ranges are available for the Model 3900S A complete list of the mirror options available for the Model 3900S can be found in Table 8 1 and Table 8 2 in Chapter 8 Service and Repair Replacement Parts Two sets of optics allow the laser to operate over wavelengths from 700 to 850 nm or 850 to 1000 nm It is easiest to switch optics after the laser is operating and optimized When changing the wavelength range change the fold mirrors M and Mg the output mirror M and the high reflector Mg one at a time in order Close the pump laser shutter before replacing each optic and open the shutter only after each is cleaned and installed 1 Tune the laser to 850 nm and optimize the output power 2 Replace the mirrors one at a time and optimiz
12. a small portion of this water may be diverted to the Model 3900S by placing T fittings in its supply and return lines Refer to Chapter 8 Service and Repair Replacement Parts for the part numbers of appropriate fittings for your specific 1on laser This completes the installation of the Model 3900S laser 4 5 Model 3900 CW Ti sapphire Laser Installing the Optional Model 3910 Regulator Filter Purge Unit 4 6 1 Verify the hoses inside the Model 3910 are still properly connected to the plastic filters Turn the Model 3910 upside down and visually inspect for loose con nections 2 Place the Model 3910 in a convenient place within 3 5 m of the Model 3900S laser head Tsunami laser with dry nitrogen Using PTFE tubing avoids introducing outgassed impurities into the cavity that may degrade system perfor mance and or cause damage to the optical coatings Warning W PTFE tubing is included in the accessory kit Use it when purging the 3 Connect the purge line from the Model 3910 purge unit to the Model 3900S laser head Use the 3 5 m PTFE purge line provided to connect the Model 3910 to the laser head It comes with a Clip Lok connector on one end and a quick disconnect connector on the other The purge line is attached by pressing the hose connectors onto their mating connectors until they snap in place Figure 4 4 a Attach the Clip Lok connector to the output of the Model 3910 b Attach the quick di
13. adjusted as described in Chapter 4 Installation and Alignment Cavity Alignment Replacement Parts Table 8 1 Replacement Parts Standard Model 3900S Optics Optic Description Coating Range Part Number M Mo M3 Pump beam flat 450 530 nm G0342 001 Ma Pump beam focus 475 530 nm G0323 001 M5 Mg Cavity fold 700 850 nm G0079 012 Ms Mg Cavity fold 850 1000 nm G0079 013 M Output coupler 700 850 nm G0324 003 M Output coupler 850 1000 nm G0324 005 Mg High Reflector 700 850 nm G0324 002 Mg High Reflector 850 1000 nm G0324 004 Birefringent filter Three plate 0440 5530 Brewster window assembly 0441 8110 Table 8 2 Model 3900S Optic Sets Wavelength Mirror Set Description Birefringent Filter Range Part No Part No Comments 675 750 nm 0440 5505 Optional short mirror set 0434 8973 Align on yellow dot 700 850 nm 0440 5501 Standard short mirror set 0434 8973 Align on blue dot 800 900 nm 0440 5503 Optional middle mirror sei 0434 8974 Align on white dot 850 1000 nm 0440 5502 Standard long mirror set 0434 8973 Align on yellow dot 950 1100 nm 0440 5504 Optional long mirror set 0434 8973 Align on blue dot Specifications only available after factory test at additional charge on laser intended for use Use birefringent filter Part No 0434 8974 for tuning near or slightly beyond 1100 nm Align on the purple dot Table 8 3 Model 3900S Accessories and Replacement Parts Service and Repair Description Part Numb
14. both the birefringent filter and Ti sapphire rod have been carefully optimized at the factory Under no circumstances should either be removed from their mounts or their alignments altered except for a translation adjustment of the rod Any other modification or adjust ment made by persons other than a qualified Spectra Physics service engineer will void the warranty Release the lock down screws securing fold mirrors M and M so they can be adjusted by gently sliding the mount Figure 4 6 The initial position of each mount should be as shown the edges of the fixed and adjustable portions of the slide mounts are offset by about 0 5 mm The correct distance from the centers of M and M to their respective nearest rod face is 47 mm Lock the mirror slides in position once the adjustment is complete M Slide M Slide Lockdown Screws Mount Position Mount Position with 5 mm offset with 5 mm offset Figure 4 6 Location of M and M lock down screws M4 Lock down Screws Micrometer Setting Figure 4 7 M Lock down Screws and Micrometer Setting Note o Installation and Alignment Release the lock down screws securing the pump focus mirror M Adjust the micrometer on the M mirror mount so the vernier reads 3 5 Figure 4 7 This will set the distance from the front face of M to the rear face of M to approximately 69 mm The optimum pump focus mirror position will depend somewhat on the divergence of the pump beam and the
15. cleaning grasp the edges of the mir ror and gently work it out of the holder use finger cots to prevent contami nation After cleaning screw in the mirror holder until snug finger tight 1s sufficient Excessive tightening will damage the optic After the optic is installed open the pump laser shutter and adjust only M to restore maximum power Clean and replace the optic in the high reflector mirror holder in the same fashion as described for M After installation adjust only Mg for maximum power Fold Mirrors M and My A knurled spring loaded sleeve holds each of these mirrors in place Unscrew the sleeve from the mirror holder and clean each optic within its holder After cleaning carefully install the mirror making sure that the mirror is not binding and is actually free to move side to side slightly as it rests against the three balls within the mirror mount As with M and Mg screw the optic in place until snug These mirrors must be cleaned with 7 5 Model 3900S CW Ti sapphire Laser great care to insure optimum laser output After installing M open the pump shutter and adjust M for maximum power Better control over align ment is achieved through an adjustment of M rather than M unless the ori entation of the mirror mount for M has been disturbed In the same fashion clean and replace M next and adjust M for maxi mum output Pump Mirrors M M M and M This mirror set is not changed when wavelen
16. de pulso dependen de las opciones de bombeo y de la con figuracion del laser Producto laser clase 4 van oog of huid aan directe straling of weerkaatsingen daar van Vermogen golfleugten en pulsd uur afhankelijk van pomp optics en laser configuratie Klasse 4 Laser Produkt Laserklasse 4 2 6 Laser Safety CE Declaration of Conformity We Spectra Physics Inc Industrial and Scientific Lasers 1330 Terra Bella Avenue P O Box 7013 Mountain View CA 94039 7013 United States of America declare under sole responsibility that the Model 3900S cw Ti sapphire Laser Manufactured after December 31 1996 meets the intent of Directive 89 336 EEC for Electromagnetic Compati bility Compliance was demonstrated Class A to the following specifications as listed in the official Journal of the European Communities EN 50081 2 1993 Safety Requirements for Emissions EN 55011 Class A Radiated EN 55011 Class A Conducted EN 50082 1 1992 Immunity IEC 801 2 Electrostatic Discharge IEC 801 3 RF Radiated IEC 801 4 Fast Transients I the undersigned hereby declare that the equipment specified above con forms to the above Directives and Standards Mauedlog Steve Sheng Vice President and General Manager Spectra Physics Inc Industrial and Scientific Lasers January 1 1998 2 7 Model 3900S CW Ti sapphire Laser CE Declaration of Conformity We Spectra Physics Inc Industrial and Scientific L
17. density comes from having a high pump intensity and a high Ti ion con centration Losses in the Ti sapphire laser come from losses in mirror coat ings and polished surfaces and more importantly in the residual loss in the Ti sapphire material itself This loss is both proportional to the rod length and varies with the Ti concentration generally increasing as the Ti con centration increases It is very difficult to achieve a continuous high inversion density over the entire volume of a Ti sapphire rod several millimeters in diameter To cir Laser Description cumvent this problem the pump light is focused to a narrow line within the rod and the oscillating laser mode is similarly focused and overlapped within the same volume a technique known as longitudinal pumping A proprietary computer analysis developed at Spectra Physics was used to optimize the optical cavity design of the Ti sapphire laser The result is a laser that is efficient has a low pumping threshold and is also easy to align A four mirror folded cavity 1s used to allow tightly focused cavity and pump modes within the laser rod while providing a collimated output beam of normal size The beam path is shown in Figure 3 3 M Mo Polarization Rotator Input Alignment Aperture Argon ee ees ee es Laser Pump Birefrigent _ Ma Pump Focus Filter n Laser Output na Ms Fold Beam Block po Ti sapphire M7 Output Coupler 2 d
18. distance between the pump and Ti sapphire lasers Do not secure the pump focus mirror at this time Open the pump laser shutter Verify that the pump beam still strikes the center of M and M and that the pump power is at a minimum Align M and M Orient M horizontally green and vertically blue so the pump beam strikes the approximate center of the face of M Orient M horizontally and vertically so the focused pump beam passes through the centers of the concave surfaces of M and Mg striking the center of the Ti sapphire laser rod The concave surfaces are those fac ing the Ti sapphire rod You might need to adjust the translation of the Ti sapphire rod By this point the pump beam will have interacted with a total of nine coated and polished surfaces including the Ti sapphire rod itself Dirt or dust particles on these surfaces will degrade the pump beam If you sus pect dirt on any surface refer to Chapter 7 Maintenance for optics cleaning instructions Raise the power of the pump laser For safety close both Ti sapphire and pump laser shutters Raise the pump laser tube current to approximately 4 or 5 W and let it warm up for 10 minutes before making the remaining adjustments During this time ensure that the faces of the Ti sapphire rod are clean Finally open both shutters Adjust M Place a white card over the aperture at M and adjust M to center a broad fluorescence spot on M as shown in Figure
19. is perpendicular to the intracavity beam the unit will lase when the pump laser shutter is opened Adjust the etalon tilt Slightly release the knurled nut near the vertical adjustment knob and using an Allen wrench adjust the etalon vertically for maximum out put power Tighten the knurled nut to secure Narrow Linewidth Options Birefingent M3 Me M4 Pump Focus Pump Beam Internal Filter Assembly Vertical M1 Mo Vertical Vertical Adjust Input Alignment Aperture Shutter Input Thin Etalon Tuning Shutter Handle Mg Vertical Output Coupler M7 Vertical M6 Ti sapphire Rod Translation Thick Etalon Thick Etalon Thin Etalon Thin Etalon Vertical Rod Control Assembly Vertical Vertical Assembly Adjustment Adjustment The horizontal control for mirror mounts M3 to Mg is the unlabeled knob Figure 5 1 Model 3900S Mirror Mount and Control Locations including Etalon Assembly Options Thin Etalon Mounting Assembly Thick Etalon Mounting Assembly Figure 5 2 Model 3900S with Etalon Assembly Options Model 3900S CW Ti sapphire Laser 5 4 Etalon Mount Assembly Mirror Mount Mg Figure 5 3 Etalon Mount Assembly with M Modification 6 Tune the laser output Adjust the black knob on the rear escutcheon to tune the laser Bear in mind the following as you use the thin etalon e Cavity alignment can change the cavity mode beam direction with respect to the thin etalon This then will change the wavel
20. sys tem If the lower surface requires cleaning remove only the filter stack from its mount Note which color dot is aligned with the Allen screw in the mount loosen the screw using the wrench provided in the laser tool kit and gently pull the filter out Clean the surface s with a folded acetone saturated tissue clamped in a hemostat Use very little pressure the filter is made of thin material and can be very easily damaged If you removed the filter from its holder make sure to install it with the appropriate dot aligned with the setscrew Do not overtighten screw If the Maintenance filter micrometer adjustment has been calibrated for wavelength recalibra tion will now be necessary Additionally if the filter is removed adjust M for maximum power after installing the filter Cleaning the Brewster Windows The Model 3900S incorporates Brewster angle windows at the input and output ends to seal the unit allowing the system to be nitrogen purged Refer to Table 8 3 in Chapter 8 for purge options Close the pump laser shutter Remove the retaining screws on both sides of the trim rings front and rear and remove the inner sleeve to expose the Brewster windows for cleaning Clean the surfaces with a folded acetone saturated tissue clamped in a hemostat When cleaning the inside surfaces cut the excess folded tissue to allow the tissue and hemostat to fit through the window access slot in the holder Replacing Fil
21. to avoid dust Do not get in eyes Avoid breathing dust and prolonged contact with skin Use with adequate ventilation Keep container closed Wash thoroughly after handling Do not ingest OTHER HANDLING AND STORAGE CONDITIONS pH Range if in Aqueous Slurry 8 11 F 4503 80 0946 11 80 5C Lithographed in U S A Notes Notes 1 Model 3900S CW Ti sapphire Laser Notes 2 Notes Notes 3 Model 3900S CW Ti sapphire Laser Notes 4 Notes Notes 5 Model 3900S CW Ti sapphire Laser Notes 6 Report Form for Problems and Solutions We have provided this form to encourage you to tell us about any difficul ties you have experienced in using your Spectra Physics instrument or its manual problems that did not require a formal call or letter to our service department but that you feel should be remedied We are always interested in improving our products and manuals and we appreciate all suggestions Thank you From Name Company or Institution Department Address Instrument Model Number Serial Number Problem Suggested Solution s Mail To FAX to Spectra Physics Inc Attention ISL Quality Manager ISL Quality Manager 650 961 7101 1330 Terra Bella Avenue M S 15 50 Post Office Box 7013 Mountain View CA 94039 7013 U S A E mail sales splasers com www spectra physics com
22. various optional optic sets However a wave length measuring device should be used to obtain an accurate reading Installation and Alignment Approximate Wavelength nm 1000 990 980 970 960 950 940 930 920 910 900 890 880 870 860 0 00 al Yellow 850 840 830 820 810 800 790 780 770 760 750 740 730 720 N N O O O Blue 3 4 5 Micrometer Setting Figure 4 9 Wavelength Calibration Chart 770 760 750 740 730 720 710 700 690 680 670 660 650 640 630 Approximate Wavelength nm O NO O Yellow 1080 1070 1060 1050 1040 1030 1020 1010 1000 990 980 970 960 950 940 CO OO Blue or Purple 3 4 5 Micrometer Setting Figure 4 10 Optional Wavelength Calibration Chart 900 890 880 870 860 850 840 830 820 810 800 790 780 770 760 7 N 00 White 2 Model 3900 CW Ti sapphire Laser 4 14 Chapter 5 Narrow Linewidth Options Two different solid etalons may be added to the Model 3900S Ti sapphire cw tunable laser to achieve narrow linewidth operation The use of two equal length collimated legs with a centered gain medium allows laser operation in two adjacent longitudinal modes with little power loss The thin etalon 0 5 mm thick with a free spectral range FSR of 200 GHz allows operation with less than 15 GHz linewidth It is tuned by tilting the etalon via a black knob on the rear panel Continuous tuning is possib
23. EXPLOSION HAZARD DATA EXTINGUISHING MEDIA SPECIAL FIREFIGHTING PROCEDURES UNUSUAL FIRE AND EXPLOSIONS HAZARDS REACTIVITY DATA INCOMPATIBILITIES STABILITY Model 3900S CW Ti sapphire Laser A 4 MATERIAL SAFETY DATA SHEET cont d STOCK NO 4034 PAGE 2 ALSO APPLIES TO 4034 4037 4037 DATE 2 7 86 HAZARDOUS COMBUSTION OR DECOMPOSITION PRODUCTS HAZARDOUS POLYMERZATION WILL NOT OCCUR SPILL OR LEAK PROCEDURES STEPS TO BE TAKEN IF MATERIAL IS RELEASED OR SPILLED While wearing suitable protective devices gather and sweep Up Place in plastic bags for disposal WASTE DISPOSAL METHOD According to federal state and local ordinances SPECIAL PROTECTION INFORMATION SPECIAL PRECAUTIONS Use respirator such as 3M model 8710 or equivalent for protection against nuisance dusts Wear long sleeves and loose fitting clothing Wash work clothes separartely from other clothing then rinse washer thoroughly NOTICE The information contained in the MSDS description is applicable exclusively to the chemical substances identified herein and for its intended use as an analytical reference standard or reagent and to the unit quantity intended for that purpose The information does not relate to and may not be appropriate for any other applications or larger quantity of the substance described Our products are intended for use by individuals possessing sufficient technical skill and qualification to use the material with suitable discreti
24. Model 39008 CW Ti Sapphire Laser User s Manual IS Spectra Physics The Solid State Laser Company 1335 Terra Bella Avenue Mountain View CA 94043 Part Number 0000 213A Rev C September 2002 Preface This manual contains information you need in order to safely install align operate maintain and service your Model 3900S CW Ti sapphire laser The Unpacking and Inspection section contains information on how to unpack your Tsunami system and lists the items you should have received It also lists any options you may have purchased Please read this short but important section before you begin to unpack your unit The Introduction contains a brief description of the Model 3900S and lists system components and accessories available for this unit Following that section is an important chapter on laser safety The Model 3900S and its pump laser are Class IV lasers and as such emit laser radia tion which can permanently damage eyes and skin This section contains information about these hazards and offers suggestions on how to safe guard against them It also suggests installation procedures and mainte nance you must perform in order to keep your system in compliance with CE and CDRH regulations To ensure your system is installed according to these regulations and to minimize the risk of injury or expensive repairs be sure to read this chapter then follow these instructions Laser Description cont
25. Model 3910 purge unit Removing the Purge Line from the Laser Head and Model 3910 To release the purge line from the laser head press inward on the metal locking flange on the quick disconnect while gently pulling on the hose To release the purge line from the Model 3910 purge unit press inward on the wire clip spring while gently pulling on the hose When you are ready to begin laser alignment turn on the water supply and warm up the pump laser for 20 minutes Cavity Alignment Note Although there are many similarities between jet dye lasers and the Ti sapphire laser cavity alignment technique is not one of them If you are familiar with dye laser alignment do not attempt to apply these tech niques to the Model 3900S Please carefully follow the instructions below for best results Aligning the Mirrors and Rod 1 Place a power meter in the beam path at the output of the Ti sapphire laser Verify that the pump laser is set to minimum power 2 Locate initial optics positions Note Although all optics positions were optimized at the factory all align ment procedures are repeated here in the event that misalignment has occurred Release the lock down screws on the rod translation stage Move the rod back and forth using the translation control noting the extent of allowed travel Adjust the rod to the center of this range and gently secure 4 7 Model 3900 CW Ti sapphire Laser 4 8 Warning W The alignment of
26. N CLASS 4 LASER PRODUCT MAXIMUM OUTPUT IS DEPENDANT MAXIMUM OUTPUT IS DEPENDANT UPON AND UPON AND LESS THAN INPUT LESS THAN INPUT RADIATION EMITTED WAVE RADIATION EMITTED WAVELENGTH LENGTH DEPENDS UPON FILTER SETTING DEPENDS UPON FILTER SETTING SEE MANUAL CLASS IV LASER PRODUCT SEE MANUAL 0451 8120 Figure 2 1 These CDRH and CE standard safety warning labels would be appropriate for use as entry warning signs ANSI 4 3 10 1 EN 60825 1 Figure 2 2 Folded Metal Beam Target Caution Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure Follow the instructions contained in this manual for safe operation of your laser At all times during operation maintenance or service of your laser avoid unnecessary exposure to laser or collateral radiation that exceeds the accessible emission limits listed in Performance Standards for Laser Prod ucts United States Code of Federal Regulations 21CFR1040 10 d Any electronic product radiation except laser radiation emitted by a laser product as a result of or necessary for the operation of a laser incorporated into that product 2 2 Interlocks Danger Laser Radiation Laser Safety Because the energy to drive the lasing process in the Model 3900S comes from another laser and not from an internal source such as electrical dis charge the interlock differs slightly from that of oth
27. O aga ra Eent ra H SAE Aa E E GE KA S re Ate ug EE e ee ER A dg d i i SS AME 3 D i or WASTE DISPOSAL METHOD Bury in a landfill SUR 8 Ef E a SC e EECH TC E K da E S mb VE DE eee A VO bb CT RIE OI PANI WEE H IA Pra AM 4 x eet ER EF Set Bi EE NU SPECIAL PROTECTION INFORMATION EE EN AS A Ve Ch Ae aLi y NE K WK wats N HI n P 30 d i P AN T A E 0 ADS Y des GA Za o SE 4 Sch n i h o bee H ES Pe E rh ei 7 EA ATORY PROTECTION specify type If there is excessive dustiness wear a respirator selected as per OSHA 29 CFR 1910 134 LOCAL EXHAUST SPECIAL See OSHA 29 CFR 1910 134 None MECHANICAL general OTHER See OSHA 29 CFR 1910 134 None PROTECTIVE GLOVES EYE PROTECTION Safety glasses Not required but recommended or goggles selected as per OSHA OTHER PROTECTIVE EQUIPMENT 29 CFR 1910 133 VENTILATION ZE eo We Era AT a T La pe Ra Ik m gras A Baba Ak We Al da fa AA PE Pina A ee E LI A PAINT Each ATALA Ee NO A Lei E Naa RARA Ce RK d z Geh E Er We ci Ta DI d a An ete al tyes LC a ge E Ka WE ir ee te SE A ee A E IX SPEC A E A ONS se sr Wel ae GA See agas BEA KG P eg KE EAN ol de NAS EE dl PRECAUTIONS ve ir a o dd oe KE vn E de Phi EOS ZC Ug oe LAMG da de d e ak Fad AP ei l ty Mud paba 4 Far g ge TENOR IR ti ER E Causes eye irritation Breathing dust may be harmful May cause skin irritation Open container slowly
28. Pittsfield MA 01202 4949 Tel 413 499 0514 Chapter 3 Laser Description Titanium doped sapphire Ti sapphire is a solid state laser medium capa ble of tunable laser action over a broad range of near infrared IR wave lengths The broad absorption band in the blue and green make a Millen nia diode pumped laser an ideal pump source for this material Ti sap phire eliminates much of the effort required to operate dye lasers in the near infrared as there are no dyes to change no circulators to clean and no drop in output power as dyes degrade Ti sapphire as a Laser Medium Ti sapphire is a crystalline material produced by introducing Ti O into a melt of Al O A boule of single crystal material is grown from this melt by one of several techniques The Ti ion is responsible for the laser action of Ti sapphire It substitutes for a small percentage of the AI ion and the electronic ground state of the Ti ion is split into a pair of vibrationally broadened levels as shown in Figure 3 1 20 Relaxation E Infrared Fluorescence O Blue green gt Absorption D c D 2 To 5 0 Figure 3 1 Energy level structure of Ti in sapphire Absorption transitions occur over a broad range of wavelengths from 400 to 600 nm only one of which is shown in Figure 3 1 Fluorescence transi tions occur from the lower vibrational levels of the excited state to the upper vibrational levels of the ground state The resulting
29. RES UNUSUAL FIRE AND EXPLOSIONS HAZARDS Dust can present a potential for dust explosion REACTIVITY DATA INCOMPATIBILITIES STABILITY Stable AVOID Close proximity to violate solvents open flames strong oxidizing or reducing chemicals HAZARDOUS COMBUSTION OR DECOMPOSITION PRODUCTS HAZARDOUS POLYMERZATION WILL NOT OCCUR SPILL OR LEAK PROCEDURES A 5 Model 3900S CW Ti sapphire Laser MATERIAL SAFETY DATA SHEET cont d STOCK NO 5779 PAGE 2 ALSO APPLIES TO 57720 5779A 8124 5779 DATE 2 5 86 STEPS TO BE TAKEN IF MATERIAL IS RELEASED OR SPILLED Collect with broom and shovel Wear a particle mask goggles and gloves If media becomes wet store for waste disposal in plastic lined containers Do not enter large closed vessels without a self contained breathing apparatus especially when carbon is wet as wet activated carbon removes oxygen from air WASTE DISPOSAL METHOD Dispose of unspent carbon in refuse container SPECIAL PROTECTION INFORMATION Respiratory Dust or particle mask Mechanical Dust filter Protective Gloves Corrosive chemical resistant SPECIAL PRECAUTIONS While handling use a particle mask goggles and gloves Store away from violate organic solvents and moisture to preserve media NOTICE The information contained in the MSDS description is applicable exclusively to the chemical substances identified herein and for its intended use as an analytical reference standard or reagent and to the unit quantity
30. age to equipment sensitive procedures and exceptional circumstances All messages are set apart by a thin line above and below the text as shown here Laser radiation is present Condition or action may present a hazard to personal safety Condition or action may present an electrical hazard to personal safety Condition or action may cause damage to equipment Action may cause electrostatic discharge and cause damage to equip ment Condition or action may cause poor performance or error Text describes exceptional circumstances or makes a special refer ence Do not touch Appropriate laser safety eyewear should be worn during this opera tion Refer to the enclosed documents and manual before operating or using this device Xi Standard Units The following units abbreviations and prefixes are used in this Spectra Physics manual Quantity Unit Abbreviation mass kilogram kg length meter time second S frequency hertz Hz force newton N energy joule J power watt W electric current ampere A electric charge coulomb C electric potential volt V resistance ohm O inductance henry H magnetic flux weber Wb magnetic flux density tesla T luminous intensity candela cd temperature celcius C pressure pascal Pa capacitance farad F angle radian rad Prefixes tera 101 T deci 10 d nano 10 on giga 10 G centi 102 c pico 101 p mega 10 M mill 103 m femto 11035 f kilo 10
31. ains a brief exposition on Titanium sapphire laser theory which is followed by a more detailed description of the Model 3900S laser system The chapter concludes with system specifications and outline drawings The middle chapters describe the Model 3900S controls then guide you through its installation alignment and operation The last part of the man ual covers maintenance and service The latter includes a replacement parts list Customer Service contains a list of world wide Spectra Physics ser vice centers you can call if you need help Where as the Maintenance section contains information you need to keep your laser clean and operational on a day to day basis Service and Repair is intended to help you guide your Spectra Physics field service engineer to the source of any problems Do not attempt repairs yourself while the unit is still under warranty instead report all problems to Spec tra Physics for warranty repair Should you experience any problems with any equipment purchased from Spectra Physics or you are in need of technical information or support please contact Spectra Physics as described in Customer Service This chapter contains a list of world wide Spectra Physics Service Centers you can call if you need help Model 3900S CW Ti sapphire Laser This product has been tested and found to conform to Directive 89 336 EEC for Electromagnetic Compatibility Class A compliance was demon str
32. al acuity 1s poor in the extreme red try using the argon goggles described in Step 7 or use an infrared viewer Adjust M Place the white card over Mg and adjust M to center a small fluorescent spot fainter than that in Step 9 onto M Remove the card and increase pump power to the recommended oper ating power the Model 3900S should lase If not place the white card over the power meter and observe the faint spots on the card with the goggles or infrared viewer A pattern of misaligned spots should be visible that can be aligned by adjusting M and M to start the system lasing 11 12 13 14 Installation and Alignment Adjust for maximum power output M and Mg Before this centering is attempted adjust the laser for maximum power To achieve maximum power output M and Mg must be walked and the laser mode must strike the center of M and Ma Adjust only M and M to maximize power output They must be adjusted in an organized manner Adjust the horizontal green and vertical blue controls of M and Ma in pairs First adjust the horizontal control of Mg for maximum power Then adjust the horizontal control for M for maximum power Repeat this procedure back and forth until no further increase in power is possible from horizontal adjustments alone In a similar manner adjust only the vertical controls of M and Mg for maximum power Go back and forth between the horizontal and vertical controls i
33. all these surfaces are accurately aligned at Brewster s angle The Model 3900S uses a proprietary Ti sapphire rod holder patent pend ing to both orient the rod surfaces at Brewster s angle and to align the c axis to be coplanar to the electric field vector This technique is used to completely compensate for unavoidable errors in rod orientation during cutting and polishing Secondly since the tuning range of Ti sapphire is far broader than any other comparable infrared laser medium the quartz plates used in the bire fringent filter must be fabricated to much higher precision than is typically required for other tunable media such as infrared dyes Finally the presence of airborne water vapor in the laser cavity leads to dis continuities in the tuning range of Ti sapphire Purging the unit with dry nitrogen gas eliminates most of the water present to improve the overall tuning performance of the system The Model 3900S is supplied with two optics sets The first allows tuning between 700 and 850 nm the second between 850 and 1000 nm Only the four cavity mirrors will require replacement when switching between these two tuning ranges the pump mirrors remain unchanged for the entire tun ing range of the Model 3900S The mirrors are quickly and easily changed Two of the optional optics sets available provide tunability from 675 to 750 nm and from 950 to 1100 nm Thus the total possible tuning range available from the Model 3900S with all
34. ance Cleaning Solutions Required e spectrophotometric grade HPLC acetone or methanol Warning Only use spectrophotometric grade acetone and or methanol Using lower grade reagents may lead to contamination of or damage to optical coatings Note Methanol tends to clean better but if not fresh may deposit a water based film on the surface being cleaned If this occurs follow the meth anol wipe with an acetone wipe to remove the film As always use fresh solvent from a bottle with little air in it General Procedures for Cleaning Optics The laser should be on and stable Remove clean and replace one optic at a time maximizing laser output power after each optic is cleaned Use clean finger cots to protect all intracavity components including the coated mirror surface Do not allow the cavity to remain open for very long The intracavity pas sive catalyst that reduces O in the cavity will become contaminated and therefore ineffective Keep the output coupler and high reflector locked in place and make sure the tubular cavity seals are in place Following these simple rules will ensure a long catalyst life The high reflector can be left in its holder for cleaning However the output coupler OC and the beam splitter must be removed from their holders to clean the second surface 1 Use a squeeze bulb dry nitrogen or canned air to clean away any dust or grit before cleaning optics with solvent Drop and Drag 2
35. asers 1330 Terra Bella Avenue P O Box 7013 Mountain View CA 94039 7013 United States of America declare under sole responsibility that the Model 3900S cw Ti Sapphire Laser Manufactured after December 31 1996 meets the intent of Directive 73 23 EEC the Low Voltage directive Compliance was demonstrated to the following specifications as listed in the official Journal of the European Communities EN 61010 1 1993 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory use EN 60825 1 1994 Safety for Laser Products I the undersigned hereby declare that the equipment specified above con forms to the above Directives and Standards par Steve Sheng Vice President and General Manager Spectra Physics Inc Industrial and Scientific Lasers January 1 1998 Laser Safety Sources for Additional Information The following are some sources for additional information on laser safety standards safety equipment and training Laser Safety Standards Safe Use of Lasers Z136 1 1993 American National Standards Institute ANSI 11 West 42 Street New York NY 10036 Tel 212 642 4900 Occupational Safety and Health Administration Publication 8 1 7 U S Department of Labor 200 Constitution Avenue N W Room N3647 Washington DC 20210 Tel 202 693 1999 A Guide for Control of Laser Hazards 4th Edition Publication 0165 American Conference of Governmental and Industr
36. ated for EN 50081 2 1993 Emissions and EN 50082 1 1992 Immu nity as listed in the official Journal of the European Communities It also meets the intent of Directive 73 23 EEC for Low Voltage Class A compli ance was demonstrated for EN 61010 1 1993 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory use and EN 60825 1 1992 Radiation Safety for Laser Products Refer to the EC Declaration of Conformity in Chapter 2 Laser Safety Every effort has been made to ensure that the information in this manual 1s accurate All information in this document is subject to change without notice Spectra Physics makes no representation or warranty either express or implied with respect to this document In no event will Spectra Physics be liable for any direct indirect special incidental or consequential dam ages resulting from any defects in this documentation Finally if you encounter any difficulty with the content or style of this manual please let us know The last page 1s a form to aid in bringing such problems to our attention Thank you for your purchase of Spectra Physics instruments Environmental Specifications CE Electrical Equipment Requirements For information regarding the equipment needed to provide the electrical service listed under Service Requirements at the end of Chapter 3 please refer to specification EN 309 Plug Outlet and Socket Couplers
37. born contaminants Condensation due to excessive humidity can also contaminate the optical surfaces Try to provide a smoke free filtered dry environment for the laser The cleaner the environment the slower the rate of contamination Notes on the Cleaning of Laser Optics Ion lasers are oscillators that operate with gain margins of a few percent Losses due to unclean optics which might be negligible in ordinary optical systems can disable a laser Dust on mirror surfaces can reduce output power or cause total failure Cleanliness is therefore essential The main tenance techniques used with laser optics must be applied with extreme care and with attention to detail Clean is a relative description nothing is ever perfectly clean and no cleaning operation ever completely removes contaminants Cleaning is a process of reducing objectionable materials to acceptable levels Since cleaning simply dilutes contamination to the limit set by solvent impurities solvents must be as pure as possible and leave as little solvent on the surface as possible As any solvent evaporates it leaves impurities be hind in proportion to its volume Avoid rewiping a surface with the same lens tissue a used tissue and solvent will redistribute contamination they won t remove it Always use fresh solvent Both methanol and acetone collect moisture dur ing prolonged exposure to air Avoid storage in bottles where a large vol ume of air is trapped ab
38. collets using a screwdriver If done with care this mirror will need minimal realign ment Remove the rear escutcheon Remove the rear escutcheon the shutter assembly and input beam trim ring 4 screws If beam tubes have been used in the laser installation slide the final beam tube into the trim ring to allow the escutcheon to be removed without disturbing any turning mirrors Assemble the new escutcheon Remove the shutter assembly and trim ring from the old escutcheon and install on the plate provided with the etalon Install onto the rear bezel Install the knobs and knob caps for Mg Align the laser Before installing the thick etalon align Mz only according to Step 9 of Cavity Alignment Aligning the Mirrors and Rod in Chapter 4 Open the pump laser shutter and align Mg for maximum output power Install the thick etalon Close the pump laser shutter and install the thick etalon assembly to the base plate 2 screws Figure 5 1 Connect electrical cables Connect the etalon cable to the one from the rear escutcheon Connect the receptacle on the escutcheon to the Model 482 etalon temperature controller Plug the power cord into the Model 482 and to your power source 5 5 Model 3900S CW Ti sapphire Laser Alignment Turn on the temperature controller Adjust the temperature control to 5 Let the etalon warm up until the panel light turns off Optimize power output If the thick etalon 1s reas
39. contained herein are factual and the opinions expressed are those of quatifled experts regarding the tests conducted the data ara not to be taken as a warranty or reprasentation for which Union Carbide Corporation assumes iegal responsibility They are offered solely nr your consideration Investigation and verification Any use of these data and Information must be determined by the user to be In accordance with appilcable Federal State and local laws and regulations UNION CARBIDE CORPORATION LINDE DIVISION 270 PARK AVENUE NEW YORK N Y 10017 A 7 Model 3900S CW Ti sapphire Laser a Zaii DDT A EFFECTS OF OVEREXPOSURE AND EMERGENCY AND FIRST AiD PROCEDURES Irritation of eyes nose and throat by dust in case of eye contact immediately flush eyes with plenty of water for at least 15 minutes If irritation persists see a physician E PET PEAS Sr Ly Lil Zu den lee Cu na ae ae ALAALA y Ve i NEE La eat F Eh ker HSC oe CH ARIA PIETRA RARI STABILITY CONDITIONS TO AVOID UNSTABLE STABLE P Sudden contact with high concentrations of chemicals having high heats of adsorption such as Olefins HCL etc INCOMPATIBILITY materials to avoid HAZARDOUS DECOMPOSITION PRODUCTS None known HAZARDOUS POLYMERIZATION CONDITIONS TO AVOID May Occur Will not Occur ag RE CN ERT A i SE A e e un Kr ie WEEK Yamag MAA AMET Tea Ne PR ee CECR Tan dp A at pa itag a VER Tee a SE A EE fe y AN Ly A
40. e beam inspect it to ver ify the optic actually got cleaner 1 e you did not replace one contami nant with another Maintenance Steps for Cleaning Optics 1 If necessary remove the optic to be cleaned from its holder to gain access to optic surface s 2 For easy access optics hold the optic horizontal with its coated surface up place a sheet of lens tissue over it and squeeze a drop or two of acetone or methanol onto it Gently draw the tissue across the surface to remove dissolved contaminants and to dry the surface 3 If stubborn contaminants remain use the Tissue in Hemostat proce dure described above to clean the surface 4 If the optic is an output coupler invert the optic and repeat the proce dure to clean the second surface 5 For the Brewster windows use the Tissue in Hemostat procedure but cut the tissue to fit within the Brewster window slot using clean Scissors Or wire cutters Removing the Mirrors for Cleaning Output Mirror M High Reflector M Remove clean and install mirrors one at a time to avoid accidental exchanges and misalignment Close the pump laser shutter while optics are being changed Further adjust the laser for maximum output after cleaning each mirror Close the pump laser shutter then unscrew the knurled mirror holder to remove the optic holder You need not remove the mirror from its holder to clean the coated surface If the front surface of the mirror needs
41. e the laser after instal ling each Clean each mirror before installing First replace Ms Realign M to maximize power 3 Next replace M Only adjust Mg to restore power Next replace M and adjust for maximum power 5 Finally replace Mg and adjust for maximum output power At this point you may wish to optimize output power as outlined in Chapter 4 Installation and Alignment Cavity Alignment 6 When changing optics the filter order must be changed Rotate the fil ter in the assembly aligning the appropriate colored dot on the filter with the setscrew on the filter adjustment assembly the blue dot for 700 to 850 nm the yellow dot for 850 to 1000 nm Turn the micro meter to 7 5 for 700 to 850 nm or to 0 5 for 850 to 1000 nm Using a monochromator and an infrared viewer rotate the filter in the adjust ment assembly until the laser operates at 850 nm At this point the tuning curve will closely follow the wavelength calibration shown in Figure 3 9 Tighten the setscrew until barely snug Adjust M to opti mize output power after changing the filter order Instructions for removing and cleaning mirrors are found in Chapter 7 Maintenance 6 3 Model 3900S CW Ti sapphire Laser Chapter 7 Maintenance The condition of the environment and the amount of time the laser 1s used will affect your periodic maintenance schedule Optics will obviously stay clean much longer if not exposed to smoke or other air
42. ecting the operating wavelength to remain fixed Wavelength change may be monitored with the scanning interferometer This completes the installation and alignment of the thick etalon assembly Chapter 6 System Startup Operation Once the Model 3900S has been installed and aligned the day to day oper ation is consistent and repeatable Provided nothing is disturbed between operating sessions only minor adjustments are required to return the sys tem to optimum performance levels l 2 Turn on the cooling water supply Close the shutter on the pump laser then turn on the laser at low cur rent and allow it to warm up Refer to the ion laser manual for the time required for warm up Increase the current to the anticipated operating level and allow the laser to warm up for an additional 5 minutes Begin the dry nitrogen purge The optional Model 3910 regulator filter purge unit is for use with bot tled nitrogen gas to eliminate problems associated with dust contami nation and the tuning discontinuities caused by oxygen and water vapor The latter exhibits strong absorption lines in the long wave length region between 840 and 1000 nm especially at 944 950 981 2 and 984 1 nm Figure 6 1 Due to the strength of these absorption lines the moisture level within the laser head must be below 1000 ppm to allow problem free mode locking For these wavelengths we rec ommend using 99 999 pure dry oil free Electronic Grade 5
43. ed to install the etalon mount Remove the adapter plate Loosen screws marked B and remove the adapter plate from the Mg mount Assemble the etalon mount and M mount Use screws marked B to attach the Mg mirror mount to the etalon mount assembly Use screws marked A to install the assembly on the baseplate Assemble the escutcheon Remove the shutter assembly and trim ring from the old escutcheon and install them on the new plate then install on the rear bezel Reinstall the knobs and knob caps for Msg Realign laser The etalon should not yet be installed into its mount Since Mg was removed to assemble the etalon mount realign it according to Step 9 of Cavity Alignment Aligning the Mirrors and Rod in Chapter A Adjust Mg for maximum output power Set up a scanning interferometer To fully utilize the thin etalon measure the linewidth of the laser out put using a scanning interferometer such as a Spectra Physics Model 410 scanning etalon or equivalent with a FSR of about 300 GHz and a linewidth of approximately 5 GHz Use a thick wedged beam splitter to reflect a portion of the output into the interferometer and optimize according to its instruction manual Clean etalon Make sure the etalon is cleaned thoroughly before installing Use lens tissue and methanol in the same manner as used to clean the laser mir rors Install the etalon Install the etalon into its mount If the etalon
44. emission and absorption spectra are shown in Figure 3 2 3 1 Model 3900S CW Ti sapphire Laser 1 0 0 5 Intensity arb units 0 400 500 600 700 800 900 1000 Wavelength nm Figure 3 2 Absorption and emission spectra of Ti sapphire The fluorescent lifetime of the excited states decrease due to non radiative transitions as the temperature rises therefore the material must be main tained at or below room temperature for efficient operation Although the fluorescence band extends from wavelengths as short as 600 nm to wavelengths greater than mm the long wavelength side of the absorption band overlaps the short wavelength end of the fluorescence spectrum Therefore laser action is only possible at wavelengths longer than 650 nm The tuning range is further reduced by an additional weak absorption band that overlaps the fluorescence spectrum This band has been traced to the presence of Ti ions but it is also dependent on material growth techniques and Ti concentration Finally the tuning range is also affected by mirror coatings tuning element losses available pump power and pump mode quality Four Mirror Folded Cavity 3 2 For continuous wave CW pumping there 1s one basic requirement for laser action the unsaturated round trip cw gain must exceed the round trip loss from all sources The CW gain is obtained by having a high inversion density and a sufficient length of Ti sapphire material A high inversion
45. en RR 5 1 Molala iON sota a a a 5 1 ANIGNMENE EE iia i 5 2 THICK ETAlIONVASSOMDIV EE 5 5 Je EH E Le WEE ieri da RI rata 5 5 AIN MENE cria di ls a in 5 6 Chapier6 Operallon i assai iaia dea 6 1 System O IR e is e Ee A 6 1 SVSIEM SAULO NAg teeta te eee ae oe eo aa ed a Seek LA ee aw Mee eee ae Mad ae eae 6 2 Tuning with the Birefringent Filter 6 3 a a AY 6 3 Changing MINOS sc 5 0 pa NAKA aoe dd e e EEN 6 3 Chapter 7 Maintenance KAN dra ridad 7 1 Notes on the Cleaning of Laser Optics 7 1 EQUIPMENT ACGUITCG WEE 7 2 Cleaning Solutions Required WEE 7 3 General Procedures for Cleaning Optics 7 3 Steps for Cleaning Optics 24am ha NA ANAN KG AN ete heed Oi aad eee be heeds ha TANG 7 5 Removing the Mirrors for Cleaning ccc ee eee ee een teen ees 7 5 QUIput MIrrorMZ socorrer ii ti ls 7 5 FIG ROMOCION MG tus os ia a ata a oa 7 5 Fod Mirrors M5 and MO ria ide aliena ehe heat 7 5 Pump MIFrors M1 M2 M3 and MA cos tr AA A a a 7 6 Cleaning the Ti sapphire Laser Rod Surfaces eens 7 6 Cleaning the Birefringent Eiter 7 6 Cleaning the Brewster Windows 0 0 ee eee eee eee eens 7 7 Replacing Filters in the Optional Model 3910 Purge Un 7 7 Chapter 8 Service and Repair 0002 ees 8 1 Troubleshooting Guide 8 1 Replacement Dn oa cities A a ee IA A al al 8 2 Chapter 9 Customer Service eee 9 1 VE EEN 9 1 Warranty ACUM FOCCOULC eg cha aay ane BOGS Nw AG ad eas kare ata
46. ength of the laser even though the birefringent filter has not been adjusted e Although the linewidth obtained with the birefringent filter is less than 40 GHz the etalon will typically tune over a range of 100 GHz e An etalon placed perpendicular to the beam will cause instability in the operating wavelength as evidenced by jitter in the scanning interferometer trace Slightly readjusting the vertical tilt adjust ment knob as per Step 5 above will eliminate this instability This completes the installation and alignment of the thin etalon assembly Narrow Linewidth Options Thick Etalon Assembly Installation The thick etalon is used with the thin etalon to achieve sub gigahertz line width from the Model 3900S Figure 5 1 and Figure 5 2 show the location of both the thick and thin etalon assemblies l Optimize laser performance Before installing the thick etalon optimize the laser performance Set up a scanning interferometer To fully utilize the thick etalon use a scanning interferometer such as a Spectra Physics Model 470 or equivalent with a FSR of about 2 GHz and a linewidth of approximately 20 MHz Use a wedged beam splitter to reflect a portion of the output into the interferometer opti mize the alignment according to the interferometer manual Remove the adjustment knobs for Mg Close the shutter on the pump laser Pry off the caps from both knobs with a thin blade Remove the knobs by loosening their
47. er Thin etalon assembly for lt 15 GHz operation Thick thin etalon assembly for lt 1 GHz operation Model 3910 nitrogen purge box Model 3910 filter assembly Optional low T output coupler 0445 0270 0445 0050 Model 3910 0449 7240 G0324 012 To optimize performance at 980 nm with a 5 W pump source Table 8 4 Hardware Description Part Number Cooling assembly for Model 2060 and 2080 lasers Mirror spring wavy washer for M M and M Mirror spring wavy washer for M Mz Mg Mz and Mg O ring for My M5 Mg Mz and Mg Threaded mirror assembly holder O ring wavy washer for M Mz and Mg Threaded mirror assembly holder O ring wavy washer for M and Mg Nylon ferrules for 14 in tubing fitting Polyethylene tubing 14 in 50 ft Bulkhead fitting 14 in tubing to Y in tubing Tool kit Routing mirror mounts set of two with beam tubes Routing mirror 488 514 nm broadband high reflector for use with Model 341 04 0429 9200 0440 4430 2801 4660 2504 2430 0441 0160S 0440 3600S 1300 0124 2519 0120 1300 2014 0445 2460S Model 341 04 G0234 003 Two included Optics not included Model 3900S CW Ti sapphire Laser Chapter 9 Warranty Customer Service At Spectra Physics we take pride in the durability of our products Consid erable emphasis has been placed on controlled manufacturing methods and quality control throughout the manufacturing process Nevertheless even the fi
48. er Verify when the cover interlock on the pump laser is defeated the defeat mechanism is clearly visible and prevents installation of the cover until disengaged Laser Safety CE CDRH Radiation Control Drawing SPECTRA PHYSICS LASERS P O BOX 7013 MT VIEW CALIFORNIA 94023 7013 MANUFACTURED MONTH VISIBLE AND INVISIBLE US ELECTROMAGNETIC N WHEN OPEN AND MODEL SMN THIS LASER PRODUCT COMPLIES RABIATI OPEN A WITH 21 CFR 1040 AS APPLICABLE INTERLOCK DEFEATED SEE MANUAL SEE MANUAL MADE IN U S A Danger Interlocked Caution Interlocked Housing Label 3 Certification and Housing Label 2 Identification Label 1 VISIBLE AND OR INVISIBLE LASER RADIATION AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION CLASS 4 LASER PRODUCT MAXIMUM OUTPUT IS DEPENDENT UPON AND LESS THAN INPUT RADIATION EMITTED WAVELENGTH DEPENDS UPON FILTER SETTING AVOID EXPOSURE SIT os sen CDRH Aperture Label 4 Warning Logotype Label 5 Label 6 VISIBLE AND INVISIBLE LASER RADIATION IS EMITTED FROM THIS APERTURE SEE MANUAL CE Aperture Label 7 Beam Output 4 Figure 2 4 Model 3900S CE CDRH Radiation Control Drawing 2 5 Model 3900S CW Ti sapphire Laser Label Translations For safety the following translations are provided for non English speak ing personnel The number in parenthesis in the first column corresponds to the label number listed on the previou
49. er lasers The Model 3900S laser has only one interlock the shutter interlock Figure 2 3 It blocks the pump beam at the entrance to the laser head housing to prevent the Model 3900S from lasing When installed the laser head cover holds the shutter interlock open for normal operation When the cover 1s removed the shutter closes automatically Operating the laser with the cover off may expose people to high volt ages and high levels of radiation It also increases the rate of optical sur face contamination Therefore operating the laser with the cover off 1s not recommended The alignment procedures in this manual require internal adjustments while the laser is operating The interlock can be defeated to allow this When the cover is removed and access to the pump beam is required raise the red shutter lever to defeat the interlock and hold the shutter open In this position the red lever clearly shows the defeat and prevents cover installa tion until the shutter lever 1s lowered to the closed position Interlock Shutter Shutter Handle Figure 2 3 The Model 3900S Interlock Shutter 2 3 Model 3900S CW Ti sapphire Laser Maintenance Required to Keep this Laser Product in Compliance with Center for Devices and Radio logical Health CDRH Regulations 2 4 This laser product complies with Title 21 of the United States Code of Fed eral Regulations chapter 1 subchapter J parts 1040 10 and 1040 11 as applicable To maintai
50. for Indus trial Uses listed in the official Journal of the European Communities Environmental Specifications The environmental conditions under which the laser system will function are listed below Indoor use Altitude up to 2000 m Temperatures 10 C to 40 C Maximum relative humidity 80 non condensing for temperatures up to 31 C Mains supply voltage do not exceed 10 of the nominal voltage Insulation category II Pollution degree 2 Table of Contents PICIACE oie se si Nee Ee oe eee is eee eres iii Environmental Specifications es V CE Electrical Equipment Requirements V Environmental Specifications V Warning Ree Vun e LEE Xi Standard UNS coi ABALA E ER e BIDA EA a xiii Unpacking and Inspection 0 0 ce ees XV Unpacking Your LASER sis a eed Mua eS Beet Be AS A EE XV System ee elen EE XV PRC SSO Uma ma AA psa EE XV Chapter 1 IntrOGUCHON 2 26 5030 wnaa tesa E beware cee 1 1 S eu ele LEE 1 1 Bee e 1 2 Chapter 2 Laser ebe ia a E EE ew eee 2 1 Precautions for the Safe Operation of Class IV High Power Lasers ire Nah een wee DONE EL AETA KA ERA aes ees 2 1 a Lala AA ee 2 3 Maintenance Required to Keep this Laser Product in Compliance with Center for Devices and Radio logical Health CDRH Regulations 2 4 CE CDRH Radiation Control Drawing 2 5 LabpelTranslalonS EE 2 6 CE Declaration of Conformity emissions LL 2 7 CE Declaration of Conformity low voltage
51. for all the wavelengths the Model 3900S can access Although the broad tuning range of Ti sapphire over laps two orders of the filter the narrower wavelength range of the mirror set per mits only one order to oscillate at a time The filter is installed and adjusted for the 700 to 850 nm range If the 850 to 1000 nm range is desired the only change required of the filter along with a change in the optics set 1s to rotate the entire three plate filter in its holder to access the order most useful for longer wavelengths The alignment of the three plate stack itself is set at the factory and will never need changing Tuning Characteristics of the CW Ti sapphire Laser 3 4 The tuning characteristics of the CW Ti sapphire laser are influenced by several factors some dependent on cavity parameters such as birefringent tuning elements and Brewster surfaces and some inherent to the Ti sap phire material itself Optics Sets Pumping Options Laser Description Because both the Ti sapphire and the filter plates are birefringent proper filter operation is achieved only if the c axis of the rod is aligned coplanar with the polarization of the electric field within the cavity Since the bire fringent filter plates and the Ti sapphire rod represent a total of eight Brew ster angle surfaces the polarization within the cavity is largely determined by the orientation of these surfaces Cavity losses are minimized and tuning is optimized if
52. four optics sets and a 20 W pump source 1s 675 to 1100 nm The complete tuning range may not be available if less than 20 W of input pump power is used A third optional mirror set covers the 800 to 900 nm range A special bire fringent filter is required for use with this mirror set to avoid the flip between tuning orders with the standard birefringent filter The Model 3900S can be pumped by Spectra Physics Millennia Vs J VIs J VIIIs J sand Xs J solid state lasers or Model 2016 2017 2020 2030 2040 2060 and 2080 argon ion lasers The ion pump lasers can be operated single line at 514 5 nm or all lines as long as at least 5 W of TEM output power is obtained The most efficient operation is obtained with pump powers over 10 W Call your Spectra Physics service engineer regarding pumping options 3 5 Model 3900S CW Ti sapphire Laser Table 3 1 Model 3900S Specifications Performance Category 3900S 1 3900S 2 Average Power 5 W Pump 750 mW 750 mW 20 W Pump 2 5 W 3 25 W Tuning Range 5 W Pump 750 950 nm 750 950 nm 20 W Pump 700 980 nm 700 980 nm Peak Wavelength 790 nm 790 nm Linewidth lt 40 GHz lt 40 GHz Noise lt 1 lt 1 Stability lt 3 lt 3 Spatial Mode TEMoo TEM go Polarization gt 100 1 Horizontal gt 100 1 Horizontal Beam Diameter 0 95 mm 0 95 mm Beam Divergence 1 0 mrad 1 0 mrad Specifications subject to change without notice They are valid only if the pump laser meets all of its
53. g will crack the plastic 7 Place the new filter assembly in the box and connect and secure it in reverse order of disassembly 7 1 Model 3900S CW Ti sapphire Laser Push the hose fittings into their mating connectors until they snap into place This completes the filter replacement procedure Dry Clean Flow Adjust Nitrogen Output Nitrogen Input Air Gas Oil Filter Liquid Filter output output Cap Screw Molecular Sieve Assembly Cap Screw Figure 7 3 Underside of the Model 3910 showing filter assembly placement and orientation Chapter 8 Troubleshooting Guide Service and Repair Use this guide if Model 3900S performance drops unexpectedly or if per formance cannot be restored after moving the laser or changing optics If after trying the following troubleshooting suggestions you are still unsuc cessful in returning your laser to normal operation call your Spectra Physics representative for help Symptom No Output Power Possible Causes Corrective Action Insufficient pump power Birefringent filter order is set incorrectly Cavity optics are out of alignment Pump beam optics are out of alignment Pump power must be at least 5 W Verify the birefringent filter is set to the correct order for the operating wavelength Align the blue dot with the setscrew when using 700 850 nm optics Adjust M and Mg as described in Chapter 4 Installation and Align ment Cavity Alignment
54. gth ranges are changed and since they are not part of the laser cavity and are less sensitive to contami nation they will not often need to be removed Furthermore since the pump beam alignment is very dependent on the orientation of these mir rors removal and replacement of these mirrors may require more extensive realignment of the entire laser Nevertheless if these mirrors become excessively dusty cleaning them may improve laser performance Cleaning the Ti sapphire Laser Rod Surfaces Laser performance is extremely sensitive to dirt on the rod surfaces Do not remove the rod from the mount a small portion of rod protrudes from the end of the holder allowing easy access for cleaning After removing the beam shield from the top of the rod holder clean the rod surface with a pad of lens tissue held in a hemostat and lightly saturated with methanol or acetone Make only one pass over the rod surface each tissue wipe in one direction only Install the beam shield over the Ti sap phire rod Cleaning the Birefringent Filter Warning YU The birefringent filter assembly is carefully aligned at the factory to ori ent the filter plates at Brewster s angle Never remove this assembly from the baseplate The filter stack should never be disassembled to at tempt to clean the inner surfaces Typically only the upward facing surface of the birefringent filter tends to get dusty and it may be cleaned without removing the filter from the
55. ial Hygienists ACGIH 1330 Kemper Meadow Drive Cincinnati OH 45240 Tel 513 742 2020 Internet www acgih org home htm Laser Institute of America 13501 Ingenuity Drive Suite 128 Orlando FL 32826 Tel 800 345 2737 Internet www laserinstitute org Compliance Engineering 70 Codman Hill Road Boxborough MA 01719 Tel 978 635 8580 International Electrotechnical Commission Journal of the European Communities EN60825 1 TR3 Ed 1 0 Laser Safety Measurement and Instrumentation IEC 309 Plug Outlet and Socket Coupler for Industrial Uses Tel 41 22 919 0211 Fax 41 22 919 0300 Internet http ftp 1ec c h Cenelec European Committee for Electrotechnical Standardization Central Secretariat rue de Stassart 35 B 1050 Brussels Document Center 1504 Industrial Way Unit 9 Belmont CA 94002 4044 Tel 415 591 7600 2 9 Model 3900S CW Ti sapphire Laser Equipment and Training Laser Safety Guide Laser Institute of America 12424 Research Parkway Suite 125 Orlando FL 32826 Tel 407 380 1553 Laser Focus World Buyer s Guide Laser Focus World Penwell Publishing 10 Tara Blvd 5 Floor Nashua NH 03062 Tel 603 891 0123 Lasers and Optronics Buyer s Guide Lasers and Optronics Gordon Publications 301 Gibraltar Drive P O Box 650 Morris Plains NJ 07950 0650 Tel 973 292 5100 Photonics Spectra Buyer s Guide Photonics Spectra Laurin Publications Berkshire Common PO Box 4949
56. ill appear as non uniformities in the spot Adjusting for maximum power M position If M has not been positioned according to factory specification the laser may display two points where maximum power is obtained when horizontally scanning M and M Step 11 above Model 3900 CW Ti sapphire Laser Note a The pump mirror M should only be moved within limits that allow the laser to continue to lase This may be several turns of the micrometer adjustment if the laser is well above threshold but only one turn should be attempted at a time To adjust note the laser output power then turn the micrometer to a new position and carefully adjust mirrors M and Mg as discussed in Step 11 If more power is obtained continue with further adjustment of the pump focus in the same direction If power is reduced reverse the direction of adjustment Remember adjust by no more than one full turn at a time Adjusting the Birefringent Filter 4 12 Warning W The birefringent filter assembly is carefully aligned at the factory to ori ent the filter plates at Brewster s angle Never remove this assembly from the baseplate Also never attempt to disassemble the filter stack The birefringent filter has both a blue dot and a yellow dot on its side For operation between 700 to 850 nm align the blue dot with the setscrew in the side of the filter adjustment Reference the yellow dot for operation between 850 to 1000 nm Loosen the setscre
57. inde Molecular Sieve and MOLSIV o A HAZARDOUS INGREDIENTS TRANS MAMA NN y No TLV s have been established for this product in OSHA 29 CFR 1910 1000 1976 or ACG H 1977 ACGIH 1977 ACGIH 1977 MATERIAL mo TLV TWA Units MATERIAL Wi 56 TLV TWA Units rye Pagan ni L Ke K RG NEA Km PAS hy Be SER ZE Ihre EH AS oi ki al PHYS i AL e p DA E ata Si SE E gt E D pata Se SE GE D ne a H d Sy JK BOILING POINT 760 mm Hg FREEZING POINT SPECIFIC GRAVITY H20 1 VAPOR PRESSURE AT 20 C SOLUBILITY IN Negligibi VAPOR DENSITY air 1 WATER by wt ee PER CENT VOLATILES EVAPORATION RATE wr BY VOLUM Buty Acetata 1 APPEARANCE AND ODOR No odor depending on product may appear as a bead pellet mesh or eee MG PA EK GH DEI Ka NG PINS po de Lap ak igs er ta AR IS AAA GA i Ge LI x Cu a1 pi vi age Fr En Hi i Rese cn IN FIRE AND EXPLOSION HAZA ID DATA FLASH POINT Nonflammable AUTDIGNITION NA test method TEMPERATURE FLAMMABLE LIMITS LOWER NA UPPER NA IN AIR by volume EXTINGUISHING NA MEDIA SPECIAL FIRE FIGHTING NA PROCEDURES UNUSUAL FIRE AND EXPLOSION HAZARDS None known IN CASE OF EMERGENCIES involving this material further information is available at ali times at this telephone number 304 744 3487 For routine information contact your local Linde Supplier While Union Carbide Corporation belleves inat the data
58. ing between the pump and intra cavity beam A concave focusing mirror used away from normal incidence at an angle optimized by a patented computer analysis allows astigmatism to be induced in the pump beam that most efficiently matches the astigmatism of the cavity mode The resulting laser has high conversion efficiency and can be pumped with a variety of solid state and argon ion pump lasers The birefringent filter for the Model 3900S consists of three crystalline quartz plates placed within the laser cavity at Brewster s angle The plates are cut parallel to their optical axes and their birefringence causes the lin ear polarization of the incident laser beam to become elliptical Only one frequency will make a complete 180 or multiple there of polarization flip and return to linear polarization the polarization of all other beams rotates more or less than that and remains elliptically polarized The ellipti cally polarized wavelengths suffer additional losses at all of the Brewster angle surfaces within the cavity and fail to reach lasing threshold The birefringent filter used in the Model 3900S has a free spectral range a little greater than 150 nm This free spectral range 1s the difference between the adjacent eigenwavelengths those wavelengths that return to linear polarization after traversing the filter Rotating the filter about an axis nor mal to the plates changes these eigenwavelengths A single birefringent filter is used
59. intended for that purpose The information does not relate to and may not be appropriate for any other applications or larger quantity of the substance described Our products are intended for use by individuals possessing sufficient technical skill and qualification to use the material with suitable discretion and understanding of risk of handing any potentially hazardous chemical The information has been obtained from sources believed to be reliable and accurate but has not been independently verified by Alltech Associates Inc Accordingly NO REPRESENTATION OR WARRANTY EXPRESS OR IMPLIED WITH RESPECT TO MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE is made with respect to the information contained herein ATTENTION THIS PRODUCT IN TERMS OF CHEMICAL IDENTITY AND THE UNIT AMOUNT PROVIDED IS INTENDED FOR USE IN CHEMICAL ANALYSIS AND FOR HUMAN CONSUMPTION NOR ANY OTHER PURPOSE A 6 Material Safety Data Sheets MSDS MATERIAL SAFETY DATA SHEET Essentially similar to U S Department of Labor Form OSHA 20 Do Not Duplicate This Form Request an Original sig E VW e re Par aa a E AC ce eta A Seo ENS SE e Mea as iz ci PA RA AA a ii sci PRODUG DI CN EJ AT ON S PANGA KR AD LIO PRODUCT Molecular Sieve Type 5A CHEMICAL NAME Molecular Sieve Type 5A Calcium Sodium SYNONYMS Zeolites CHEMICAL FAMILY ajumino Silicates MOLECULAR WEIGHT 7777 FORMULA CaNaSi0 AL203 TRADE NAME AND SYNONYMS _ L
60. l in the laser operation area This keeps the eye s pupil constricted thus reducing the possibility of eye damage Keep the protective cover on the laser at all times Avoid looking at the output beam even diffuse reflections are hazard ous Avoid wearing jewelry or other objects that may reflect or scatter the beam while using the laser Use an infrared detector or energy detector to verify that the laser beam is off before working in front of the laser Operate the laser at the lowest beam intensity possible given the requirements of the application Expand the beam whenever possible to reduce beam power density Avoid blocking the output beam or its reflection with any part of your body 2 1 Model 3900S CW Ti sapphire Laser e Establish a controlled access area for laser operation Limit access to those trained in the principles of laser safety e Post prominent warning signs near the laser operation area Figure 2 1 e Set up experiments so the laser beam is either above or below eye level e Provide enclosures for beam paths whenever possible e Setup shields to prevent specular reflections e Setup an energy absorbing target to capture the laser beam preventing unnecessary reflections or scattering Figure 2 2 VISIBLE AND OR INVISIBLE VISIBLE AND OR INVISIBLE LASER RADIATION ASER RADIATION AVOID EYE OR SKIN EXPOSURE TO AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION DIRECT OR SCATTERED RADIATIO
61. le over a range larger than the nominal bandwidth of the birefringent filter approximately 100 GHz The thick etalon 5 mm thick with a FSR of 20 GHz allows operation in two or three adjacent cavity modes spaced by about 200 MHz Tuning is accomplished by either angular adjustment of the etalon or by temperature control of the etalon housing Thin Etalon Assembly Installation Figure 5 land Figure 5 2 show the location of both the thick and thin eta lon assemblies Figure 5 3 shows how mirror mount Mg is modified to accept the thin etalon mount 1 Optimize laser performance Before installing any etalons optimize the laser performance as described in Chapter 4 Installation and Alignment Cavity Align ment 2 Remove the adjustment knobs for Mg Close the shutter on the pump laser Pry off the caps on both knobs for the mirror mount Mg Remove the knobs by loosening their collets with a screwdriver 3 Remove the rear escutcheon Remove the rear escutcheon along with the attached shutter assembly and input beam trim ring four screws Retain these screws If beam tubes were used 1n the installation slide the final beam tube into the trim ring to allow the escutcheon to be removed without disturbing any turning mirrors 4 Remove the Mg mirror mount 5 1 Model 3900S CW Ti sapphire Laser Alignment Remove the entire Mg mirror mount by loosening screws marked A in Figure 5 3 These screws will be us
62. n compliance with these regulations once a year or whenever the product has been subjected to adverse environmental condi tions e g fire flood mechanical shock spilled solvent etc check to see that all features of the product identified below function properly Also make sure that all warning labels remain firmly attached refer to the CDRH CE drawing later in this chapter l Verify that removing the laser head cover closes the laser shutter and blocks the pump beam thereby turning off the Ti sapphire laser Verify that when the cover interlock 1s defeated the defeat mechanism is clearly visible and prevents installation of the cover until disen gaged Verify that all labels listed in Figure 2 4 Model 3900S Radiation Control Drawing are present and are firmly affixed Verify removing the remote interlock plug on the pump laser prevents laser operation Verify the laser system will only operate when the pump laser s inter lock key switch is in the ON position and that the key can only be removed when the switch is in the OFF position Verify the emission indicator on the pump laser works properly that is it emits a visible signal whenever the laser 1s on Verify that the time delay between turn on of the pump laser emission indicator and that starting of that laser gives you enough warning to allow action to avoid exposure to laser radiation Verify removing the cover of the pump laser shuts off the las
63. n pairs until maximum power is achieved Adjust for beam centering Verify that the intracavity beam is centered on M and Mg and that it is unobstructed If so skip to Step 13 To center the beam on M or Mg or both the fold mirrors will have to be adjusted However adjust only one fold mirror at a time M and M will be adjusted as a pair as will Mg and Mg This technique leaves one of the two collimated legs of the four mirror cavity unaffected making alignment much easier To center the beam on M slightly adjust M to move the intracavity beam in the desired direction The unit will stop lasing but can be re stored by adjusting M After the beam is centered and lasing is re stored maximize power by walking M and Mg Repeat this last step for Mg and Mg Adjust the rod position To maximize output power in the rod carefully release the rod transla tion lock down screws and slowly translate the rod back and forth while monitoring the output power Select a rod position that yields maximum output then gently tighten the translation stage lock down screws Scattering centers in the rod can often be located by observing the residual pump beam that is normally deposited in the beam dump Temporarily close the interlock shutter and remove the entire beam dump from the baseplate Place a screen to intercept this residual pump beam several meters from the laser and open the shutter When the rod is translated flaws and bubbles w
64. nest precision instruments will need occasional service We feel that our instruments have favorable service records compared to competitive products We hope to demonstrate in the long run that we provide excel lent service to our customers in two ways First by providing the best equipment for the money and second by offering service facilities that get your instrument back into action as soon as possible Spectra Physics maintains major service centers in the United States Europe and Japan Additionally there are field service offices in major United States cities When calling for service inside the United States dial our toll free number 1 800 456 2552 To phone for service in other coun tries refer to the Service Centers listing located at the end of this section Order replacement parts directly from Spectra Physics For ordering or shipping instructions or for assistance of any kind contact your nearest sales office or service center You will need your instrument model and serial numbers available when you call Service data or shipping instruc tions will be promptly supplied To order optional items or other system components or for general sales assistance dial 1 800 SPL LASER in the United States or 1 650 961 2550 from anywhere else All parts and assemblies manufactured by Spectra Physics are uncondi tionally warranted to be free of defects in workmanship and materials for the period of time listed in the sale
65. nitro gen at a starting purge rate of 0 3 m7 hr 10 SCFH for at least 2 hours then reducing it to 0 17 m hr 6 SCFH for the duration of the experi ment The purge can be reduced to 0 014 m7 hr 0 5 SCFH for all other wavelengths a Verify the laser head cover is in place and clamped down sealing the cavity b Verify the nitrogen tank output regulator is set to minimum then turn on the nitrogen supply c Set the output regulator to limit pressure to less than 67 kPa 10 psi d Open the Model 3900S purge bleed valve Use the Model 3910 flow control to set the nitrogen flow rate as outlined above 6 1 Model 3900S CW Ti sapphire Laser System Shutdown Transmittance Wave Number cm 1 14000 13000 12000 11000 10000 SIT 0 99 0 98 0 97 700 800 900 1000 1100 Wavelength nm Figure 6 1 Transmittance vs Wavelength for Oxygen and Water Vapor 5 Open the pump laser shutter and note the output Optimize the pump laser power if necessary 6 With a power meter in the output beam of the Model 3900S adjust the following mirrors for optimum performance a Adjust Mg and M horizontally until power is maximized b Adjust Mg and M vertically until power is again maximized c Repeat these alternating horizontal and vertical adjustments until no further power increase is observed 1 Turn off the pump laser following the shutdown procedure in its instruction manual 2 Turn off the cooling water
66. nput Ma Vertical Adjust Mg Vertical Adjust Ms Vertical Adjust M3 Vertical Adjust Mo Birefringent Filter Adjust gt Birefringent Insert Setscrew Me Vertical Adjust Ti sapphire M7 Vertical Adjust Rod Translation Control Beam Stops Brewster Window D Foot Adjust Figure 4 2 Model 3900S Optical Element Identification Installation and Alignment Birefingent Cooling M3 Ms M Pump Focus Pump Beam Internal Filter Assembly Lines Vertical My Mo Vertical Vertical Adjust Input Alignment Aperture CD N ui Shutter Input Shutter Output Handle Coupler M7 Mg Vertical Vertical Mg Ti sapphire Rod Translation Foot Vertical Rod Control Adjustment 4 The horizontal control for mirror mounts M3 to Mg is the unlabeled knob Figure 4 3 Model 3900S Mirror Mount and Control Locations Model 3910 Purge Unit Controls The optional Model 3910 contains oil and air filters and a molecular sieve assembly to dry and clean nitrogen gas for purging the Tsunami laser head It has one control and two connectors Refer to Figure 4 4 FLOW ADJUST knob used to set the laser head purge rate gas flow from 0 3 to 3 0 m7 hr 1 0 to 10 0 SCFH Flow adjust indicator displays the nitrogen gas flow rate OUTPUT connector connects the Mode 3910 to the laser head to provide dried filtered nitrogen gas INPUT FROM GAS CYLINDER connector connects the Model 3910 to a dry nitrogen gas supply Limit the input
67. on and understanding of risk of handing any potentially hazardous chemical The information has been obtained from sources believed to be reliable and accurate but has not been independently verified by Alltech Associates Inc Accordingly NO REPRESENTATION OR WARRANTY EXPRESS OR IMPLIED WITH RESPECT TO MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE is made with respect to the information contained herein ATTENTION THIS PRODUCT IN TERMS OF CHEMICAL IDENTITY AND THE UNIT AMOUNT PROVIDED IS INTENDED FOR USE IN CHEMICAL ANALYSIS AND FOR HUMAN CONSUMPTION NOR ANY OTHER PURPOSE Material Safety Data Sheets MSDS MATERIAL SAFETY DATA SHEET Alltech Associates Inc 2051 Waukegan Road Deerfield IL 60015 Phone 708 948 8600 Fax 706 548 1078 STOCK NO 5779 PAGE 1 ALSO APPLIES TO 57720 5779A 8124 5779 DATE 2 5 86 IDENTIFICATION NAME Activated Carbon CAS 7740 44 0 SYNONYMS Charcoal TOXICITY HAZRDS TOXICITY DATA Activated carbon base material non hazardous per Office of Materials Operation HEALTH HAZARD DATA ACUTE EFFECTS Eyes like any solid mechanical irritation can occur APPEARANCE AND ODOR Black irregular granules free flowing when dry without odor FIRST AID Eyes Flush with large volumes of water for 15 minutes If irritation persists see a physician Skin Wash with soap and water rinse well dry FIRE AND EXPLOSION HAZARD DATA EXTINGUISHING MEDIA SPECIAL FIREFIGHTING PROCEDU
68. onably perpendicular to the intracavity beam the unit will lase when the pump laser is turned on However because of the finesse and thickness of the etalon its orientation may radically affect output power Adjust the etalon vertically and horizontally for maximum output Then turn the blue knob about a 14 turn away from the maximum power position This prevents wavelength instability caused by feedback into the laser cavity Optimize mode structure Use the scanning interferometer to observe the linewidth When oper ating perfectly the interferometer will indicate pairs of longitudinal modes separated by the FSR of the interferometer 2 GHz with a mode spacing of 200 MHz If the laser cavity is misaligned multiple transverse modes will be exhibited as small bumps alongside the main longitudinal modes Further as pump power is increased another longitudinal mode will often appear Tilt the etalon to reduce this sec ond mode If the etalon is exactly perpendicular to the intracavity beam the mode structure will be unstable To eliminate this instability slightly mis align the etalon vertically horizontally or both Tune the laser output Because tilting the etalon affects mode stability it is best to tempera ture tune the output Increasing the temperature of the etalon length ens the solid etalon decreasing the operating frequency After adjust ing the temperature wait until the temperature has stabilized before exp
69. ose of these filter elements properly as indicated on the appropriate data sheet and refer to your local environmental regulations regarding dis posal For further information contact the chemical manufacturer at the address listed on each sheet Model 3900S CW Ti sapphire Laser This page intentionally left blank Material Safety Data Sheets MSDS MATERIAL SAFETY DATA SHEET Alltech Associates Inc 2051 Waukegan Road Deerfield IL 60015 Phone 708 948 8600 Fax 708 948 1078 STOCK NO 4034 PAGE 1 ALSO APPLIES TO 4034 4037 4037 DATE 2 7 86 IDENTIFICATION NAME Borosilicate glass wool silyated REMARKS The manufacturer of the glass wool used in these products indicates that an MSDS is not needed for their material We have elected to provide some of the safety and common sense information we believe is useful The basic product has been treated with a silyation reagent to react with the silanol groups to make it more suitable for its intended application in chromatography The glass wool is rendered hydrophobic The excess reagent is removed and to the best of knowledge should not present any additional hazard CAS 65997 17 3 SYNONYMS Angel hair fiberglass TOXICITY HAZRDS TOXICITY DATA HEALTH HAZARD DATA ACUTE EFFECTS Overexposure may cause temporary skin and upper respiratory irritation APPEARANCE AND ODOR FIRST AID Wash exposed areas with soap and warm water after handling FIRE AND
70. ove the solvent Instead store solvents in small glass bottles where either the solvents are used up quickly or the bottles are filled frequently from a fresh uncontaminated source Laser optics are made by vacuum depositing microthin layers of materials of varying indices of refraction on glass substrates If the surface 1s scratched to a depth as shallow as 0 01 mm the operating efficiency of the optical coating will be reduced significantly Because an intracavity passive catalyst is used in the Chroma 5 laser there should be little requirement for optical cleaning if the cavity is left closed and undisturbed However because optics are exchanged from time to time there will be occasions when cleaning is necessary Stick to the following principles whenever you clean any optical surface 7 1 Model 3900S CW Ti sapphire Laser Warning W Equipment Required Remove and clean one optic at a time then replace it and optimize laser output power If more than one optic is removed at time all refer ence points will be lost making realignment extremely difficult Perform any maintenance in a clean environment over an area covered by a soft cloth or pad if possible Wash your hands thoroughly with liquid detergent Body oils and con taminants can render otherwise fastidious cleaning practices useless Use dry nitrogen canned air or a rubber squeeze bulb to blow dust and lint from the optic surface before cleaning it with sol
71. pressure to 67 kPa 10 psi 4 3 Model 3900 CW Ti sapphire Laser Installation Installing the Pump Laser l 4 4 S Spectra Physics INPUT FROM SCFH OUTPUT GAS CYLINDER O O FLOW ADJUST 10 PSI MAX Figure 4 4 Model 3910 Regulator Filter Purge Unit Mount the pump laser on a suitable table A honeycomb or granite optical table is best Set up the Millennia series or argon ion pump laser according to its user s manual Adjust the feet of the pump laser so that its output beam is parallel with the table and is centered on the input widow of the Model 3900S If there is not enough adjustment to lower your pump laser appropri ately raise the Model 3900S Verify the output of the pump laser meets specifications for power and mode quality Reduce the pump laser output to a minimum For ion lasers reduce the tube current and close down the intracavity aperture If a large frame ion laser 1s used use two mirrors to route the pump beam to the Model 3900S as shown in Figure 4 5 If a small Millennia laser 1s used it can be set up so that it is in line with the Model 3900S In a typical ion laser setup the routing mirrors will be about 15 cm in front of each laser and about 38 cm apart We recommend using the two routing mirrors because it makes it much easier to direct the pump beam into the Model 3900S Routing mirror holders and optics are available from Spectra Physics Refer to Service and Repair Replace
72. published specifica tions is in POWER or LIGHT mode and pump power does not exceed the minimum required to meet specified output power 2 Specifications apply to operation at the peak wavelength noted Contact your field sales engineer for specifications at extended wavelengths 3 RMS measured in a 10 Hz to 1 MHz bandwidth Percent drift in any 2 hour period after a 1 hour warm up and less than 3 C temperature change gt Ate points Full angle Mechanical Water Pressure Range Minimum 103 kPa 15 psi Maximum 517 kPa 75 psi Inlet Temperature Range Minimum 18 C 65 F Maximum 27 C 80 F Physical Dimensions Size L x W x H 65 1 x 24 1 x 20 6 cm 25 6 x 9 50 x 8 1 in Weight 14 1 kg 31 0 Ib 3 6 Chapter 4 Installation and Alignment formed by an authorized Spectra Physics service engineer Please call your service representative to arrange an installation appointment which is part of your purchase agreement Allow only those qualified and authorized by Spectra Physics to install and set up your laser sys tem You will be charged for any damage incurred if you attempt the ini tial installation yourself and such action may void your warranty These instructions are provided in the event that you move the laser to a new location in the future Warning W The following installation and alignment procedures are to be per Controls and Connections Model 3900S Laser Head The faces of the mirror con
73. r persa van Streustreustrahlung vermeiden 4 Ouverture Laser Austritt von sichtbarer Por esta abertura se Vanuit dit apertuur Aperture Exposition Dan und unsictbarer emite radiacion laser wordt zichtbare en Label gereuse Un Rayon Laserstrahlung nicht visible e invisible niet zichtbare laser nement laser visible dem Strahl aus evite la exposicion straling geemiteerd et invisible est emis setzen vermijd blootstellilng par cette ouverture 5 Attention Vorsicht Austritt von Peligro al abrir y Gevarr zichtbare en CDRH Rayonnement Laser sichtbarer un unsicht retiar el dispositivo de neit zichtbare lasers Logo Visible et Invisible en barer Laserstrahlung seguridad exist radia traling wanneer type Cas D Ouverture et wenn Abdeckung cion laser visible e geopend en bij uitge Danger lorsque la securite geoffnet und Sicher invisible evite que los schakelde interlock Label est neutralisee expo hetisschalter uber ohos o la piel queden Vermijd blootstelling sition dangereuse de l oeil ou de la peau au rayonnement direct ou diffus Puissance et longueurs D onde dependant de la con figuration et de la puissance de pompe Laser de Classe 4 bruckt Bestrahlung von Auge oder Haute durch direkte oder Streustrahlung ver meiden Leistung Wellenlange und Pulsbreite sind abhangig von Pumpquelle und Laserkonfiguration expuestos tanto a la radiacion directa como a la dispersa Potencia Longitud de onda y anchura
74. rol The above warranty is valid for units purchased and used in the United States only Products with foreign destinations are subject to a warranty surcharge Warranty Return Procedure Warning W Contact your nearest Spectra Physics field sales office service center or local distributor for shipping instructions or an on site service appointment You are responsible for one way shipment of the defective part or instru ment to Spectra Physics We encourage you to use the original Spectra Physics packing boxes to secure instruments during shipment If shipping boxes have been lost or destroyed we recommend that you order new ones Spectra Physics will only return instruments in Spectra Physics containers Always drain the cooling water from the laser head before shipping Water expands as it freezes and will damage the laser Even during warm spells or summer months freezing may occur at high altitudes or in the cargo hold of aircraft Such damage is excluded from warranty coverage Service Centers Customer Service Benelux Telephone 31 40 265 99 59 France Telephone 33 1 69 18 63 10 Germany and Export Countries Spectra Physics GmbH Guerickeweg 7 D 64291 Darmstadt Telephone 49 06151 708 0 Fax 49 06151 79102 Japan East Spectra Physics KK East Regional Office Daiwa Nakameguro Building 4 6 1 Nakameguro Meguro ku Tokyo 153 Telephone 81 3 3794 5511 Fax 81 3 3794 5510 Japan West
75. s contract following delivery of the equipment to the FO B point Liability under this warranty 1s limited to repairing replacing or giving credit for the purchase price of any equipment that proves defective during the warranty period provided prior authorization for such return has been given by an authorized representative of Spectra Physics Warranty repairs or replacement equipment is warranted only for the remaining unexpired portion of the original warranty period applicable to the re paired or replaced equipment This warranty does not apply to any instrument or component not manufac tured by Spectra Physics When products manufactured by others are 9 1 Model 3900S CW Ti sapphire Laser included in Spectra Physics equipment the original manufacturer s war ranty is extended to Spectra Physics customers When products manufac tured by others are used in conjunction with Spectra Physics equipment this warranty 1s extended only to the equipment manufactured by Spectra Physics Spectra Physics will provide at its expense all parts and labor and one way return shipping of the defective part or instrument if required This warranty does not apply to equipment or components that upon inspection by Spectra Physics discloses to be defective or unworkable due to abuse mishandling misuse alteration negligence improper installa tion unauthorized modification damage in transit or other causes beyond Spectra Physics cont
76. s page Table 2 1 Label Translations Label French German Spanish Dutch 2 Attention Rayonne Achtung Sichtbare Precauci n radiaci n Let op Zichtbare en Caution ment visible et invisi und unsichtbare peligrosa electromag onzichtbare gevaar Defeat ble dangereux en cas sch dliche elektro n tica visible e invisi lijke electromagne able d ouverture et lor magnetische Strahl ble con el dispositivo tische straling indien Interlock sque la s curit est ung wenn Abdeckung de seguridad abierto geopend en interlock EMI neutralis e ge ffnet und Sicher o con su indicaci n overbrugd heitsverriegelung alterada berbr ckt Bedie nungsanleitung beachten 3 Attention Rayonne Vorsicht Austritt von Peligro al abrir y Gevaar zichtbare en Danger ment Laser visible et sichtbarer un unsicht retirer el dispositivo niet zichtbare laser Defeat invisible en cas barer Laserstru de seguridad exist straling wanneer able D Ouverture et lor hlung wenn radiacion laser visi geopend en bij uitge Interlock sque la securite est Abdeckung geoffnet ble e invisible evite schakelde interlock neutralisse exposi und Sicherhetisschal que los ohos o la piel Vermijd blootstelling tion dangereuse de ter uberbruckt queden expuestos van oog of huid aan Poeil ou de la peauau Bestrahlung von tanto a la radiacion directe straling of rayonnement dirct ou Auge oder Haut dircta como a la dis weerkaatsingen daar diffus durch direkte ode
77. sconnect connector to the purge input on the Model 3900S laser head input bezel nitrogen gas source nor to any source with a pressure greater than Warning W Do not connect the Model 3910 to a boil off tank or other non lab grade 67 kPa 10 psi or damage to the filters will result 4 Connect the gas supply line from the Model 3910 purge unit to the nitrogen supply Make sure you use dry oil free Electronic Grade 5 or better nitrogen 99 999 pure to prevent contamination of the Model 3910 or your laser optics Use the 2 m s in i d PTFE gas supply line provided to connect the Model 3910 to the nitrogen supply It comes with a Clip Lok connec tor on both ends a Attach one end of the gas supply line to the INPUT FROM GAS CYL INDER connector on the Model 3910 b Attach the other end of the gas supply line to your nitrogen supply If your nitrogen supply does not accept a Clip Lok connector cut off the existing connector and install your own A Clip Lok connector for 4 in 1 d PTFE tubing is also included in the accessory kit Clip Lok is a registered trademark of Anarak Inc Installation and Alignment To attach barbed connectors to PTFE tubing heat the tubing with a flameless heat source heat gun then quickly slide the tubing onto the barbed fitting while the tubing is still warm Do not move the connec tion until it has cooled Install the line and check for leaks This completes the installation of the
78. ters in the Optional Model 3910 Purge Unit The schedule for replacing the filters and dryer sieve assembly depends on the amount and quality of purge nitrogen used Change all three filters Figure 7 3 when the blue desiccant in the sieve assembly turns pink In some areas the indicator dye in the desiccant is considered a hazardous material Consult your materials manager and or local government environ mental agency for guidelines on proper disposal methods Refer to the Material Safety Data Sheets in Appendix A for information on the materi als contained in these filters Part numbers for filters are listed in Table 8 3 at the end of Chapter 8 To replace the filters and sieve assembly 1 Turn the unit upside down with the flow gauge facing away from you and remove the small screws 2 on the side nearest you 2 Disconnect the filter assembly from the flow gauge and output port Press in on the connector spring clips and pull out the hoses 3 Rotate the entire filter assembly so the small filters point upward then move the assembly to the right away from the flow gauge and lift it out 4 Remove the filter hose fittings Note the placement and orientation of each filter before disassembling the hoses Loosen the screws and remove the filter assemblies 5 Discard the filter assemblies Assemble a new filter assembly from new parts The screws at each end of the two small filters should be tight How ever over tightenin
79. this manual a test summary a packing slip listing all the components shipped with this order and an accessory kit containing the following items e Two pump beam routing mirror assemblies and a set of dust tubes e Two hoses cooling system water supply and return lines e Three foot clamps with hardware for mounting the Tsunami laser head XV Model 3900S CW Ti sapphire Laser Xvi A tool kit containing Allen hex ball drivers for optimizing laser output An IR card a tweezer A plastic hemostat A packet of Kodak Lens Cleaning Paper Any optional optics and optical assemblies that were ordered You will need to supply several items including Spectrophotometric grade HPLC acetone and methanol for optics cleaning Clean lint free finger cots or powderless latex gloves for optics clean ing Ir viewer Optical spectrum analyzer recommended Fast photodiode recommended Chapter 1 Introduction Titanium doped sapphire Ti sapphire is a solid state laser medium capa ble of tunable operation over a broad range of near infrared IR wave lengths Because of Ti sapphire s broad absorption band in the blue and green energy for the lasing process the pump energy can be supplied by a Millennia series continuous wave CW diode pumped solid state laser or by a Model 2016 2017 2020 2030 2040 2060 and 2080 argon ion laser Because there are no dyes to change no circulators to clean and no drop in
80. trol knobs have been color coded for your con venience vertical is blue horizontal is green Polarization rotator mirrors M and M rotate the vertically polarized pump beam to horizontal polarization and turn the beam by 90 Pump beam mirror M3 directs the pump beam onto the center of the pump focus mirror M Pump focus mirror M directs and focuses the pump beam into the Ti sapphire rod Both its orientation and distance from the Ti sapphire rod are adjustable Cavity fold mirrors M and M focus the cavity mode in the Ti sap phire rod while transmitting the pump beam Output mirror M and cavity high reflector M complete the four mirror cavity configuration Birefringent Filter the micrometer adjustment protruding through the top cover tunes the wavelength by rotating the birefringent filter assembly Rod translation control translates the Ti sapphire rod in a plane parallel to the Brewster angle face of the rod By moving the rod in this manner the cavity and pump modes avoid small flaws and bubbles within the rod The rod can be translated to maximize the output power while the laser is oper ating The translation stage must be released before attempting to move the rod The stage is secured by two lock down screws one on each side Fig ure 4 1 4 1 Model 3900 CW Ti sapphire Laser Rod Translation Stage Lock down Screws Figure 4 1 Rod Translation Stage Lock down Screws Purge I
81. vent Permanent damage may occur if dust scratches the coating Use spectrophotometric grade HPLC solvents Do not try to remove contamination with a cleaning solvent that may leave other impurities behind Use powder free clean latex gloves or finger cots Use Kodak Lens Cleaning Paper or equivalent to clean optics and plasma tube windows Use each piece only once a dirty tissue merely redistributes contamination it does not remove it Do not use lens tissue that is designated for cleaning eye glasses Such tissue contains silicones These molecules bind themselves to the mirror coatings and window quartz and can cause permanent damage Also do not use cotton swabs e g Q Tips Solvents dissolve the glue that is used to fasten the cotton to the stick and the result 1s contaminated coat ings Only use photographic lens tissue to clean optical components Some of the following are supplied in the accessory kit h Danger Dry nitrogen canned air or rubber squeeze bulb Plastic hemostat Clean new finger cots or powder free latex gloves Kodak Lens Cleaning Paper or equivalent Do not use a metal hemostat or forceps for cleaning optics or windows There is danger of electrocution when using these instruments in side the laser head Use the plastic hemostat provided Kodak Lens Cleaning Paper is a product of the Kodak Corporation O Tips is a product of the Johnson and Johnson Corporation 7 2 Mainten
82. w to rotate the birefringent fil ter within the mount from one dot to the other Take care not to over tighten the setscrew Observe the beam through a reversion spectroscope or a monochromator and infrared viewer Set the micrometer adjustment to 7 5 when using the 700 to 850 nm mirror set or to 0 5 when using the 850 to 1000 nm set refer to Figure 4 9 With the spectroscope or monochromator set to 850 nm adjust the orientation of the filter until the laser operates at 850 nm then tighten the setscrew The laser will now tune approximately according to the calibration chart in Figure 4 9 For accurate measurement of wavelength use a monochromator to fine tune the laser to the desired operating wavelength Optional sets of optics can be purchased to broaden the tuning range of the Model 3900S system Table 8 1 and Table 8 2 give a complete listing of all the optic sets available for this laser along with the birefringent filter set ting Align the appropriate colored dot on the side of the birefringent filter as outlined above under Adjusting the Birefringent Filter A different birefringent filter is required for use with the 800 to 900 nm optic set as well as for use when near or beyond 1100 nm with large frame pumping This filter has purple and white dots on the side of the assembly giving a reference rotation point The calibration curve Figure 4 10 gives an approximate wavelength vs micrometer setting for the
83. we aE E A a tes 9 2 SENICE Centers ss E ee a tie iS ae te nt AA Age DA e 9 3 vili Table of Contents Appendix A Material Safety Data Sheets MSDS A 1 Notes Report Form for Problems and Solutions List of Figures Figure 1 1 The Model 3900S Ti sapphire Laser nananana aaan 1 1 Figure 2 1 These CDRH and CE standard safety warning labels would be appropriate for use as entry warning signs ANSI 4 3 10 1 EN 60825 1 ee 2 2 Figure 2 2 Folded Metal Beam Target 2 2 Figure 2 3 The Model 3900S Interlock Shutter eens 2 3 Figure 2 4 Model 3900S CE CDRH Radiation Control Drawing LL 2 5 Figure 3 1 Energy level structure of Ti3 in sapphire LL 3 1 Figure 3 2 Absorption and emission spectra of Ti sapphire 3 2 Figure 3 3 Folded four mirror cavity with longitudinal pumping 3 3 Figure 3 4 Typical three mirror cavity used in a CW dye laser 3 3 Figure 4 1 Rod Translation Stage Lock down Screws 0 00 ee eee eens 4 2 Figure 4 2 Model 3900S Optical Element Identification 4 2 Figure 4 3 Model 3900S Mirror Mount and Control Locations 4 3 Figure 4 4 Model 3910 Regulator Filter Purge Unit LL 4 4 Figure 4 5 Typical system layout for Model 3900S and pump laser 4 5 Figure 4 6 Location of M5 and M6 lock down screws 4 8 Figure 4 7 M4 Lock down Screws and Micrometer Setting 4 8 Figure 4 8 The fluorescence spot as it appears on mirror M7 LL 4 10

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