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Evolution 30 - Spectra

1. 1053 nm HR Cavity Mirror Dichroic Removable Turning Mirror AOM Q Switch Turning Mirror 1057 nm a 527 nm Output Mirror 527 nm o o SY A Huese LL 8 AOM Q Switcr A oo AG 6 Nd YLF Cavity 5 Mirror Curved HR O I Nd YLF Cavity Turning Mirror Diode Laser Pumped LBO Doubling Intracavity Turning Mirror urved HR Mirror 1053 nm Nd YLF Laser Chamber Crystal Shutter 1053 nm Figure 3 2 Laser Head Optical Layout 7 8 9 10 11 Another 45 turning mirror The second acousto optic Q switch Two synchronized Q switches are needed in the Evolution 30 to hold off the high level of circulating laser light 45 intracavity dichroic folding mirror that is a high reflector at 1053 nm and has high transmission at 527 nm This mirror serves to confine the Nd YLF fundamental wavelength in the cavity while emitting the green output beam LBO frequency doubling crystal in a temperature stabilized oven described below Flat end mirror that is a high reflector at both 1053 nm and 527 nm This forms the other end of the laser resonator and also directs frequency doubled light back toward the dichroic output mirror 1203 2 turning mirrors The removable 527 nm mirror 12 directs the The output through the side panel of the laser head The 1053 nm turning mirror 13 i
2. Laser Safety O Evolution 30 O LASER ACTIVE QS SYNC OUT me RS 232 VO POWER LASER FAULT EXT QS TRIG IN LBO HEATER CONTROL TTL O High Power Diode Pumped Nd YLF Laser System Front Panel O RF Out RF Out O Interlock Current QS Syne Out Monitor TTL 1 I Rear Panel Figure 2 5 CE CDRH Radiation Control Drawing Power Supply Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser CEJCDRH Labels Spectra Physics Lasers Inc 1344 Terra Bella Avenue Mountain Vievv California 94039 MANUFACTURED MONTH YEAR MODEL SIN THIS LASER PRODUCT COMPLIES VVITH 21 CFR 1040 AS APPLICABLE MADE IN U S A 0420 7840 L Identificaiton Certification Label 1 VISIBLE AND OR INVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCK DEFEATED AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION CLASS IV LASER PRODUCT 808 7255 Danger Laser Beam Label Laser Head 2 VISIBLE AND OR INVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCK DEFEATED AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION CLASS IV LASER RADIATION g08 5326 Interlocked Cover Label Laser Head 3 AVOID EXPOSURE VISIBLE AND
3. Suggested Solution s Mail To FAX to Spectra Physics Inc Attention SSL Quality Manager SSL Quality Manager 650 961 7101 1330 Terra Bella Avenue M S 15 50 Post Office Box 7013 Mountain Vievv CA 94039 7013 U S A E mail sales splasers com www spectra physics com
4. Vanuit dit apertuur wordt zichtbare en onzichtbare laserstraling geemiteerd Vermijd blootstelling Zichtbare en of onzichtbare laserstraling Vermijd oog en huidcontact van de directe en indirecte Straling Klasse IV laserapparatuur Maximaal uitgangsvermogen lt 50 VV Golflengte 527 nm Pulsduur 200 us Opgepast zichtbare onzichtbare en hoogfrequent elektromagnetische Straling bij het openen Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser CDRH Requirements and RS 232 Control The Evolution 30 and its power supply comply with CDRH safety stan dards that apply to operating the laser through an RS232 interface A soft ware indicator shows when laser radiation is present or can be accessed Maintenance Required for CDRH Compliance 2 12 This section lists the maintenance required to keep this laser product in compliance with CDRH regulations This laser product complies with Title 21 of the United States Code of Fed eral Regulations Chapter 1 Sub chapter J Parts 1040 10 and 1040 11 as applicable To maintain compliance verify the operation of all features listed below either annually or whenever the product has been subjected to adverse environmental conditions e g fire flood mechanical shock spilled solvents This maintenance is to be performed as outlined below Verify that removing the laser cover closes the intracavity shutter Verify that all the warning labels listed in F
5. 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 manual before operating or using this device xi Standard Units The following units abbreviations and prefikes are used in this Spectra Physics manual Quantity Unit Abbreviation mass kilogram kg length meter m time second s frequency hertz Hz force newton N energy joule J power watt VV electric current ampere A electric charge coulomb C electric potential volt V resistance ohm Q inductance henry H magnetic flux weber Wb magnetic flux density tesla T luminous intensity candela cd temperature Celcius C Fahrenheit F pressure pascal Pa capacitance farad F angle radian rad Prefixes tera 102 T deci 107 d nano 10 n giga 109 G centi 102 c pico 107 p mega 105 M mill 103 m femto 107 f kilo 109 k micro 10 nu atto 10 a xiii Abbreviations These abbreviations may be found in this manual AC AOM APM AR bi fi CDRH CW DC E O fs GTI GVD HR IR OC ps PZT RF SBR SCFH SPM TEM Ti sapphire UV A alternating current acousto optic modulator active pulse mode locking antireflection birefringent filter Center of Devices and
6. Continue as for periodic changing of solution see below OptiShield is a registered trademark of Opti Temp Inc A 1 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Periodic Changing of Solution 1 After draining the fluid refill the reservoir with 2 pints of OptiShield fluid and the remaining volume 14 pints vvith steam distilled vvater 2 Turn on the chiller and verify that water is flowing Inspect for leaks at the hose connections between the laser head and chiller 3 Turn off the chiller Please note that it takes the chiller about 15 minutes to stabilize the temper ature of the laser head cold plate and thus the output of the laser If the laser is used frequently leaving the chiller on between periods of use will eliminate this stabilization period If the laser is used infrequently turn the chiller off between periods of use OptiShield Algaecide MSDS Sheet for Optishield MATERIAL SAFETY DATA SHEET OPTISHIELD Page 1 of 2 DATE REVIEWED July 2001 DISTRIBUTOR OPTI TEMP INC Telephone 231 946 2931 P O Box 5246 Emergency Hot Line Traverse City Michigan Chem Tel 800 255 3924 49696 International 813 977 3668 Collect USE OF PRODUCT Treatment of select cooling water systems SECTION Product Identification Special Components Chemical Names This is a proprietary blend which contains the following components Name In Product Sodium Nitrate lt 1 Sodium Molybdate 1 2 Sod
7. QSW MODE set to HOLD OFF Cavity optics are out of alignment Rotate shutter to the open position or remove the plug from the side port Change the setting of the QSW MODE selector in the SYSTEM screen of the Control Soft ware If the cavity optics are so far out of alignment that the laser will not start contact your authorized service representative Symptom Variations in output power Possible Cause Corrective Action LBO crystal temperature has drifted Water temperature variation Cavity optics are out of alignment Optics are dirty Q switch breakthrough Check the output povver across the tuning range of the LBO crystal for the highest out put povver as described in Chapter 6 Mainte nance Verify that the water chiller temperature is adjusted to the temperature that vvas set vvhen it vvas installed typically in the range of 18 27 C Adjusting the cavity mirrors slightly may opti mize the output power Read the detailed instructions in Chapter 6 Maintenance before attempting to adjust the mirrors Inspect the optics for dirt or contamination If dirty clean them as described in Chapter 6 VVith the current at the High setting turn the QSVV MODE selector to the HOLD OFF posi tion and turn the laser on Using an infrared viewer or card verify that there is no infrared and or visible output beam from the laser If there is any laser output the Q switch is mal fun
8. 2 5 Protective Housings dame e NT BEA den OE ANAN a ds ee ht 2 5 Cover Safety Interlocks 4 282 2 6 Beam Safety Shutter sie u Miri a k a et 2 6 Beam Attenuator Output Port 2 6 Location of Controls 2 i kaka a A A AE ei 2 6 Operating Instructions 2 6 Warning Labels 5 22 2 Lace sus Kaba dam wee be Pe a e 2 6 CE CDRE Drawings e da ves ran dk Dr tid s da a Wee tees Abe a E aaa 2 7 vii Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser d i TE WEE riskant 2 10 Label Translations secos deste ed er re aed dee ti 2 11 CDRH Requirements and RS 232 Control 2 12 Maintenance Required for CDRH Compliance aa 2 12 CE Declaration of Conformity 2 13 Sources for Additional Information 2 14 Laser Safety Standards Ki ra reer ay d Pee Ga the ne q e dada kee 2 14 Equipment and Framing ices md ki ekan qt A eu nu ane Le nait ere ar 2 15 Chapter 3 System Operation 3 1 Nd LE Laser Material caido aa Seaton a Ede de 3 1 Acousto Optic Q Switching a a ea aa aa aaa aa aa aaa aa aa aa aaa aaa 3 2 Intracavity Frequency Doubling 3 3 Laser Head Configuration aa ea ea aa aaa aa aa aa aaa eaaa aaa 3 3 Component Descriptions 3 5 Laser Pump Chamber 3 5 AOM Switches siie VE ia sea en See t A dd Mae ae ee Kee 3 5 LBO Cr
9. AOMs are made of a high quality fused silica to which RF transducers are bonded The fused silica is cut and polished to be optically oriented at Brewster s angle for s polarized intra cavity laser radiation Approximately 30 Watts of RF power are delivered to each AOM through two 50 ohm BNC cables The AOMs are water cooled and have built in temperature interlocks to shut off the RF power if an over temperature con dition occurs The power for the AOM Q switches is supplied from the Evolution 30 power supply LBO Crystal and Temperature Controller The LBO crystal is anti reflection coated for both 1053 nm and 527 nm It is located in an oven that maintains its temperature at a value set at the fac tory between 315 and 340 F to within 0 1 F At this factory set temperature the crystal is non critically phase matched for converting the intracavity 1053 nm wavelength efficiently to the second harmonic The crystal should be constantly stabilized in this temperature range even when the laser is not in use If necessary the crystal can be ramped down to room tempera ture for long term storage of the laser see Chapter 5 System Operation The temperature controller is a pre programmed microprocessor based interlock device If the LBO temperature is outside of the range of the fac tory set point threshold values are also set at the factory an indicator lamp will come on and an interlock will prevent operation of the las
10. Fig ure 2 2 must be shorted in order to enable laser operation CURRENT MONITOR connector BNC output that indicates the amount of current flowing through the diode arrays The scale is 10 amps volt The power supply for the Evolution 30 is similar in appearance to those used by other models of the Evolution laser family but the power supplies are NOT interchangeable Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Control Software Main Controls Note 5 4 The control software for the Evolution 30 is called Evolution 30 Control and it is accessed using a Windows shortcut found in the Programs folder of the START menu The latest version of the software is always available from Spectra Physics This section describes the controls for the current version of the software 2 4 2 Evolution 15 Control Software File Edit Operate Tools Window Help Evolution 30 CURRENT SETTING A SYSTEM FAULT ERROR LOG FACTORY A y ai ELAPSED TIME 20000 45 EXTERNAL CURRENT MONITOR A INTERNAL 4 HOLD OFF CW RF OFF RUN LASERACTIVE STOP EXIT amp SAVE n Leg SETTINGS QSW FREQUENCY kHz QSW PULSE WIDTH uS Cer STOP D so RAMPING KEY SWITCH Software Version 2 4 2 February 2002 Figure 5 3 Evolution 30 Control Software RUN STOP control simulates a push button control that changes the state of the Evolution 30 between RUN and STOP When the RUN state is selected t
11. OR INVISIBLE LASER RADIATION IS EMITTED FROM THIS APERTURE VISIBLE AND OR INVISIBLE LASER RADIATION AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION CLASS IV LASER PRODUCT MAX OUTPUT lt 50 W WAVELENGTH 527 nm PULSE LENGTH 200 ps 808 5326 Aperture Label Laser Head 4 Danger Label Laser Output Specifications 5 Caution Label High Voltage 6 Caution Label 7 CAUTION VISIBLE INVISIBLE AND RF ELECTROMAGNETIC RADIATION WHEN OPEN 808 7099 Caution Label RF Energy Present 8 DANGER VISIBLE AND OR INVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCK DEFEATED AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION CLASS 4 LASER PRODUCT VORSICHT SICHTBARE UND ODER UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNG GEOFFNET UND SICHERHEITSVERRIEGLUNG UBERBRUCKT BESTRAHLUNG VON AUGEN ODER HAUT DURCH DIREKTE OER STREUSTRAHLUNG VERMEIDEN LASER KLASSE 4 DANGER VISIBLE AND OR INVISIBLE LASER RADIATION AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION CONSULT INSTRUCTION MANUAL CLASS 4 LASER PRODUCT DANGER RAYONNEMENT LASER VISIBLE ET OU INVISIBLE DANGEREUSE EN CAS D ORVERTURE NEUTRALISEE EXPOSITION DANGEREUSE DE L OEIL OU DE LA PEAU AU RAYONNEMENT DIRECT OU DIFFUS VORSICHT SICHTBARE UND ODER UNSICHTBARE LASERSTRAHLUNG BESTRAHLUNG VON AUGEN ODER HAUT DURCH DIREKTE OER STREUSTRAHLUNG VERMEIDEN NAHERE INFORMA
12. President and General Manager Spectra Physics Laser Group April 5 2002 Mountain Vievv California USA 2 13 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Sources for Additional Information The follovving are some sources for additional information on laser safety standards safety equipment and training Laser Safety Standards 2 14 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 Industrial 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 0211Fax 41 22 919 0300 Internet http ftp iec c h Cenelec E
13. circum stances Table 4 1 Utility Requirements for the Evolution 30 Destination Acceptable Line Voltage Current Requirements A Frequency Vac Hz Laser Chiller USA 110 10 VAC 60 Hz 15 15 Japan 110 10 VAC 50 60 Hz 15 15 or 220 22 VAC 50 Hz 10 10 Europe 220 22 VAC 50 Hz 10 10 Preparing to Install the Power Supply To prepare for the installation of the power supply The power supply must be placed within 10 feet 3 meters of the laser head to avoid straining the umbilical If possible the power supply should be placed in a ventilated 19 inch equipment rack For proper airflow allow 6 inches 15 cm of clearance to the front and back panels of the power supply Take measures to prevent the heated air exhaust from the back panel fans from returning to the air intake on the right side panel as as viewed from the back of the supply or from flowing toward the laser head Failure to do so may cause overheating in the power supply and instability in the laser output Verify that the interlock jumper plug is in place on the back panel of the power supply If you intend to use the laser in a limited access area remove the jumper and wire it to a safety switch The switch must be wired so that when the device is activated for example a door is opened the switch opens and the laser turns off see Chapter 2 Verify that the local line frequency and voltage are within the accept able input ranges for the
14. demonstrate that the damage occurred as a result of shipping If you need to return the system for service at a later date the specially designed container assures adequate protection The Evolution 30 system is shipped in four crates Laser head Power supply Computer and accessory kit Chiller Each should be carefully opened and unpacked in a clean dry area Inspect each component as you unpack it To open a crate remove the clamps around the top edge of the crate and lift off the top The sides are perma nently fixed to the pallet Do not turn the crates upside down or on their sides Once out of their crates do not turn the laser head or the chiller upside down or on their sides Damage to these units may result Such damage is not covered by your warranty xvii Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Accessory Kit xviii The laser head is cradled between foam blocks Remove the laser head and its attached umbilical cord taking care not to lift the unit using the umbili cal cord or its attachment Remove any tie wraps or tape holding the umbil ical cable in place Put the foam blocks back in the shipping crate for storage Remove the laptop computer and accessory box and place them on the table The Evolution 30 power supply is strapped to its shipping crate Remove the straps and carefully lift the power supply out of the crate and place it on the ground The last crate contains the ch
15. for most Evolution 30 systems the OptiShield solution should be changed once a year according to the following procedure Before handling the OptiShield water treatment chemical read the Material Safety Data Sheet included in Appendix A This sheet describes the potential hazards of this material and provides handling precautions associated with it This chemical can be harmful if swallowed inhaled or absorbed through the skin or eyes Use only STEAM DISTILLED water in the Evolution 30 cooling system The use of de ionized water may cause corrosion damage Periodic changing of solution 1 Drain the old fluid from system 2 The chiller has a 2 gallon capacity Refill the reservoir with 2 pints of OptiShield and the remaining volume 14 pints with steam distilled water 3 Turn on the chiller and verify that water is flowing e g the flow inter lock has not been activated Inspect for leaks at the hose connections between the laser head and chiller 4 Turn off the chiller OptiShield is a registered trademark of Opti Temp Inc Chapter 7 Troubleshooting and Customer Service Troubleshooting Guide This general purpose troubleshooting guide is provided to assist you in isolating some of the problems that might arise during use of the Evolution 30 laser system for example if performance drops unexpectedly A complete repair procedure is beyond the scope of this manual and should be addressed by your authorized
16. hazards of the equip ment and who is competent to administer first aid e When possible keep one hand away from the equipment to reduce the danger of current flowing through the body if a live circuit is touched accidentally e Always use approved insulated tools when working on equipment e Special measurement techniques are required for this system Ground references must be selected by a technician who has a complete under standing of the system operation and associated electronics Protective Eye Wear It is recommended that laser safe eye wear be worn at all times when the Evolution 30 laser is operating The eye wear should be attenuated to at least protect against the following wavelength ranges e 1047 1053 nm Covers the fundamental operation vvavelength e 523 527 nm Covers the second harmonic wavelength e 794 810 nm Covers wavelength emitted by the diode lasers During normal operation of the laser the operator will not be exposed directly to hazardous diode laser emission However removal of the mechanical housing cover will not only invalidate your warranty but will expose you to hazardous diode laser radiation Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser CDRH Compliance Povver Svvitch A Danger Y Keyswitch Emission Indicators The safety features listed below have been incorporated into the Scientific version of the Evolution 30 to conform to federal performance standards as required by 21 C
17. increases the rate of optical surface contamination Removing the cover that protects the optical cavity will void your warranty A solenoid activated safety shutter mounted in the optical cavity interrupts laser action when necessary By default when the laser is turned on either by pressing the ON button or by issuing a software command to turn on the laser the shutter is activated closed The interlock fault and fail safe mode is the closed position Beam Attenuator Output Port Location of Controls The beam from the laser output port can be blocked by a manually operated shutter If the optional side port is used a metal disc supplied can be inserted into that port to block emission The Evolution 30 laser is controlled via the serial interface of a remote computer Software is provided with the laser If the software terminates the computer malfunctions or the serial connection is broken the Evolu tion 30 will stop lasing within 3 seconds Operating Instructions Warning Labels Chapter 3 contains instructions for safely operating the Evolution 30 laser Certification and warning labels are affixed to the Evolution 30 laser to verify compliance with 21 CFR 1040 to provide information on the wave length and power emitted and to warn the user against accidental exposure to laser radiation The location and type of warning logo labels used on the Evolution 30 laser head for the Scientific and OEM versions are show
18. manufac turer s instructions Attach the 9 pin connector of the Evolution 30 serial cable to the computer s serial output port and attach the 25 pin connector to the RS 232 port on the power supply For control computers shipped with Windows 2000 the default user name is Administrator and the default password is PASS case sensitive no quotation marks The Evo lution 30 control software is pre installed on the control computer 4 3 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Preparing to Install the Chiller e Verify that the local line frequency and voltage are within the accept able input ranges for the chiller e The chiller will be located on the floor close enough to the Evolution 30 that the cooling hoses will reach without strain not drawn into the laser power supply which could affect the stability of N Caution I The chiller must be located so that the warm air exhaust from the back is the laser e Allow 6 inches 15 cm of clearance between the chiller and the Evolution 30 power supply to prevent hot air from one unit being drawn into the other e The chiller should not be placed above the laser or power supply If a leak ever developed in the chiller dripping water could damage the unit below it e The hose connectors are attached so that the feed line marked with an arrow pointing toward the laser head is attached to the lower hose connector on the laser head This will e
19. necessary to optimize the LBO crystal temperature see the procedure below LBO Crystal Temperature Optimization Warning W Caution W Depending on environmental conditions the optimum LBO crystal temper ature for efficient intracavity doubling may vary slightly from the factory set point LBO crystal temperature can be varied plus or minus 1 5 F around the factory set temperature to compensate for environmental effects If at any time while optimizing the LBO temperature at the Medium current setting output power drops by more than 20 turn off the laser immediately Optical damage could occur if the LBO temperature is severely detuned resulting in insufficient second harmonic light being coupled out of the optical resonator Perform the optimization proce dure described below If you are uncertain about this procedure contact your authorized Spectra Physics service representative for assistance If the temperature of the LBO heater deviates from the factory setting by more than 1 5 F an LBO TEMP fault will occur In this event return the setting to the factory setting and restart the optimization procedure but in the opposite temperature direction If you still believe the optimum LBO temperature setting is more than 1 5 F away from the factory setting contact your authorized Spectra Physics service representative 6 3 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser To optimize the LBO
20. of the neodymium atoms in the YLF crystal which emit the 1053 nm light characteristic of their laser transition The mirrors in the Evolution 30 laser cavity are all highly reflective of 1053 nm radiation so 1t is entirely contained inside the resonator This light is Q switched by means of acousto optic modulators to produce pulses from 100 to 350 ns long The pulse duration depends on the pulse repetition rate and pump level which are selected by the user The Evolution 30 green output at 527 nm is produced by passing Nd Y LF generated light through the frequency doubling LBO lithium triborate crystal In order to maximize the conversion of the fundamental wavelength to the green harmonic the LBO crystal is placed inside the laser cavity where the fundamental beam is most intense the conversion efficiency increases rapidly with the intensity of the fundamental light input LBO offers excellent efficiency and a high damage threshold These 527 nm pulses exit the laser head from the forward output port or from the side output port if the internal turning mirror is used The Evolu tion 30 is ideally suited for pumping Ti sapphire ultrafast amplifiers Nd YLF Laser Material The Evolution 30 uses neodymium doped lithium yttrium fluoride Nd LiYF most commonly abbreviated as Nd YLF as its gain medium Its long upper state lifetime 470 us provides efficient energy storage for high pulse energy operation at low repetition rates The l
21. reading 13 14 15 16 17 18 Maintenance Click on RUN on the screen display to start the Evolution 30 then use an infrared vievver or card to verify there is no visible or infrared output from the laser If any is detected turn off the laser and contact Spectra Physics for assistance Slowly turn up the current to the High setting while monitoring laser power Power should remain at zero as the current ramps all the way up to the maximum current setting As in the previous step verify that there is no visible or infrared output and if any is detected turn off the laser and contact Spectra Physics for assistance Click on STOP on the screen display then slide the QSW MODE selec tor to INTERNAL set laser current to the Low setting and restart the laser with the Laser State switch Note the output power level Fine tune the vertical and horizontal adjustment screws on the mirror to return output power to the maximum value previously recorded Once output power is optimized slowly turn up the power control to the Medium current setting and then to the High setting while moni toring the power meter When the current reaches the High setting allow the laser to stabilize and note the stable power level Tf at any time laser power starts to fluctuate rapidly turn off the laser and contact Spectra Physics for assistance If this procedure does not cause the Evolution 30 to meet its specified power it may be
22. right to operate the equipment Table of Contents Pr face aa t iii Environmental Specifications V CE Electrical Equipment Requirements aa V Environmental Specifications a a aaa aaa aaa aa een V FECC R g lationS nr 16 sa sm pe avidin ete te EE v Warning Conventions x iste sede cia ada aane xi Standard UNS asnicar sora xiii Ab reviati ns dr ari an nr ARDE E We A sa NE Sa nono XV Unpacking and Inspection xvii Unpacking Your Laser Torr ins pipe Pane h a xvii Accessory RI irc SE a er EN EDER ie den xviii Chapter de ERT e Et Le VE 1 1 The Laser Head u ser kaki Ped eta eben eier adi le dans Lela de tad t 1 1 The Power SUupply seen ere e e at hated a edged Sg 1 2 UNE een eeler ul 1 2 The Closed Loop Chiller an 1 2 Chapter 2 Laser Safety sve v ad do ve de e da a r a 2 1 Hazards its buke e Ban een A e eta tees 2 1 Optical Safety Precautions a ea a aaa eaaa aa een een 2 2 Electrical Safety Precautions 2 3 Protective Eye Wear sigo dat ar dit ad Rn E E E AA 2 3 ER Cie Belle Tue 2 4 Power Switch aak eds meat ak a deed chewed a BEE Oe 2 4 KOYSVVILORE dara Ga ese A e e dee Viele aes 2 4 Emission Indicators sie Hua Med a are et vas AD E nalen be 2 4 Fault Indicator c pan en aaa eh ee Lael ba da d ie 2 5 Remote Interlock Connector 2
23. temperature 1 Cleaning the Optics 6 4 Warning W Warning W Warning W Note the present temperature setting as displayed on the LBO temper ature controller screen Set the laser current to the Medium setting turn on the laser and allow 1t to stabilize for 10 minutes Note power output with a power meter While monitoring output power use the up down arrows on the LBO HEATER CONTROLLER to change the temperature set point by 0 5 F After the temperature stabilizes at the new setting again note output power If power has increased change the temperature by another 0 5 Fin the same direction If it decreased change the temperature by 0 5 F in the opposite direction Repeat this until the power is maxi mized When output power has been maximized make a note of the tempera ture setting for future reference The Evolution 30 is sealed against dust and debris but depending on the cleanliness of the environment it is possible that some dust may get into the laser head When this happens clean the optics Cleaning the optics will require opening the optical cavity This proce dure should not be performed without prior approval of your authorized Spectra Physics service representative Unauthorized opening of the seal will void your warranty and may damage your laser Cleaning the optics may result in misalignment of the laser cavity After cleaning the cavity should be realigned using the procedure ear
24. to OFF and remove the key from the keysvvitch Turn off the main povver svvitch Turn off the chiller if the system is used infrequently If the Evolution 30 vvill be disconnected from line voltage for an extended period of time greater than a few minutes follow this procedure to slowly ramp down the LBO crystal temperature to room temperature to avoid thermal shock to the crystal 1 On the LBO Heater Control module on the front panel of the power supply note the factory setting then press and hold the down arrow button lower right until the temperature setting is 75 F or cooler Allow the crystal temperature to ramp down until it reaches 75 F Turn off the Evolution 30 povver supply and disconnect the povver cord To return the Evolution 30 to normal operation plug in the power supply and reset the temperature to the factory set temperature noted during shut down When the LBO crystal reaches the new set point the laser can be operated normally Chapter 6 Maintenance The Evolution 30 has been designed for minimal maintenance The routine procedures described in this chapter are recommended to keep the system in good working condition For further information contact your Spectra Physics service representative Lasing Optimization Cavity Mirror Adjustments Warning W Eyewear Required 3 All of the optical mounts in the Evolution 30 are securely fastened to the rigid base plate of the laser head
25. C cable is removed If an external Q switch signal is being used verify the signal is at least 2 V into a 50 ohm load and at least 2 5 us wide also verify the frequency is the desired value between 1 10 kHz Change the setting of QSW MODE to INTER NAL If either QSW cable has been removed the Evolution 30 will report a VSWR error and change the QSW MODE to CW RF OFF Ver ify both BNC cables are attached at both the power supply and laser head Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Customer Service Warranty At Spectra Physics we take pride in the durability of our products We place considerable emphasis on controlled manufacturing methods and quality control Nevertheless even the finest precision instruments need occasional service This vvarranty supplements the vvarranty contained in the specific sales order In the event of a conflict between documents the terms and condi tions of the sales order shall prevail The Evolution 30 is protected by a twelve month warranty All mechanical and optical parts and assemblies are unconditionally warranted to be free of defects in workmanship and material for the warranty period At its elec tion Spectra Physics will repair or replace without charge components that prove defective during the warranty period The obligation of Spectra Physics is limited to repair covered under the warranty return procedure described below Equipment repaired or rep
26. Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser User s Manual S Spectra Physics The Solid State Laser Company 1335 Terra Bella Avenue Mountain View CA 94043 Part Number 0000 298A Rev B December 2002 Preface This manual provides information regarding the operation and maintenance of the Evolution 30 Laser Spectra Physics vvill send a representative to install the Evolution 30 call us for details The performance of the Evolu tion 30 is not guaranteed unless it is installed by an authorized representa tive of Spectra Physics The Introduction contains a brief description of the Evolution 30 laser system and the accessories provided vvith it Follovving that section is an important chapter on safety The Evolution 30 is a Class IV laser and as such emits laser radiation which can perma nently damage eyes and skin This section contains information about these hazards and offers suggestions on how to safeguard against them To mini mize the risk of injury or expensive repairs be sure to read this chapter then carefully follow these instructions Laser Overview contains a short section on laser theory regarding the Nd YLF crystal and second harmonic generation used in the Evolution 30 It is follovved by a more detailed description of the Evolution 30 laser sys tem and concludes vvith system specifications and outline dravvings The next few chapters describe the Evolution 30 controls t
27. Evolution 30 and the chiller as ordered Ensure that the umbilical and all electrical cables can be safely routed without strain or compression System Installation Preparing to Install the Laser Head To prepare for the installation of the laser head Note that the laser head is attached to the povver supply via a 10 foot 3 meters long umbilical There are 4 cables inside a 4 pin current cable a 26 pin signal cable and two BNC cables that connect to the RF OUT connectors on the back of the power supply To secure the laser head on an optical table or other flat mounting surface OEM Evolution 30 Two slots are provided at the center of the front and back of the laser housing for securing the laser head using standard table screws M6 or 14 20 to fasten the laser to the table The arm at the front of the laser is bolted in place last since securing this first will defeat 1ts purpose in allowing for thermal expansion or contraction of the housing Scientific Evolution 30 Place the laser head on the table and adjust the four mounting feet to the correct height making sure that the laser head is level Lock the height of the feet using the locking ring on each leg Secure the laser head to the table using a mounting clamp supplied on each foot Preparing to Install the Control Computer The Evolution 30 control computer needs to be within 10 feet 3 meters of the power supply The computer should be set up according to the
28. FR 1040 10 h 1 iv Any modification or use of the Evolution 30 laser that changes disables or overrides the function of the engineering controls and safety features inval idates the Class IV certification of the laser described in this manual Power Switch Keyswitch Emission Indicator Fault Indicator O LASER ACTIVE O Taser FAULT LBO HEATER CONTROL Figure 2 1 System Safety Features on the Front Panel This front panel rocker switch turns on ac power to the power supply Line voltage to the LBO crystal heater circuit is present when the power supply is plugged in even when the switch is in the OFF position A separate keyswitch is provided to enable power to the laser diodes and serves as a reset switch to clear tripped and corrected interlocks This key cannot be removed from the switch except in the OFF position This pre vents use of the laser by unauthorized personnel This keyswitch does not turn off power to the power supply After a start command has been issued the emission indicator on the laser head and the LASER ACTIVE lamp on the power supply turn on to warn that the laser emission is present or imminent The following also occur e Scientific Evolution 30 An emission indicator on the front of the laser housing turns on when ever current is supplied to the diode lasers warning that hazardous laser radiation is present or ca
29. Nevertheless the mirrors may become slightly misaligned due to changes in room temperature bumps or other stresses on the laser head If this happens the end mirrors of the laser cavity may require adjustment Improper adjustment of the Evolution 30 laser can result in damage to the laser rod or LBO crystal Do not attempt to adjust the Evolution 30 mirrors until you have read this section If you are uncertain about this procedure contact your Service representative for assistance Protective eyewear MUST be worn for protection from all wavelengths emitted by the Evolution 30 Refer to Chapter 2 Laser Safety in this manual Use the following procedure to optimize the cavity mirrors Materials required e Laser safety goggles e Infrared viewer or card e Two Vs inch ball tipped Allen wrenches e Calibrated power meter capable of measuring at least 30 watts 6 1 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser 6 2 Procedure 1 10 11 12 If the Evolution 30 is lasing stop the output by sliding the Laser State switch to STOP It is not necessary to turn off the power to the power supply Scientific version only Lift the sheet metal cover from the laser head Scientific version only Locate the two interlock by pass plates with orange warning stickers and use them to lock down the cover inter lock switches This allows the laser to be operated with the sheet metal cover rem
30. Radiological Health continuous vvave direct current electro optic femtosecond or 10 second Gires Toutnois Interferometer group velocity dispersion high reflector infrared output coupler picosecond or 1077 second piezo electric transducer radio frequency saturable Bragg reflector standard cubic feet per hour self phase modulation transverse electromagnetic mode Titanium doped Sapphire ultraviolet vvavelength XV Unpacking and Inspection Unpacking Your Laser Warning W Warning W Your Evolution 30 laser was packed with great care and its container was inspected prior to shipment If any major damage was noticed at the time of receipt holes in the containers water damage crushing etc please notify the carrier It is recommended that you wait for your Spectra Physics representative to unpack your system In no event should you attempt to install the laser yourself or remove the lid sealing the laser cavity Either action if unauthorized will void your warranty and you will be charged for the repair of any damage that may result Refer to Chapter 4 System Installation If you choose to unpack your laser system carefully inspect the system as you do so If any damage is evident such as dents or scratches on the covers or broken parts immediately notify the carrier and your Spectra Physics sales representative Keep the shipping containers If you file a damage claim you may need them to
31. Spectra Physics service representative Symptom Laser will not start Possible Cause Corrective Action No ac line power Check whether red AC POWER LED is lit If not verify that breaker on front of power sup ply is in the correct position verify that the power cord at the rear of supply is tight verify that the fuse is good Interlocks are not closed Check the LASER FAULT LED on the power supply and the FAULT panel of the software If interlock indicators are on turn the keyswitch off and back on to clear latched interlocks Investigate any interlocks that are not cleared by this action For example verify that the chiller is turned on and the hoses are not con stricted verify that the laser head cover is on verify that the user interlock is in place etc Refer to Chapter 2 for more information on interlocks Key switch is not in the ON Turn the key switch to the ON position horizon position tal The key cannot be removed when it is in this position Communications error with the Verify that there is a good connection with the control computer 9 pin to 25 pin serial cable Exit the Control Software application then turn off ac power to the power supply wait 5 seconds turn on power again and restart the Control Software Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Symptom Emission light comes on but no output Possible Cause Corrective Action Output shutter is closed
32. TIONEN SIEHE BEDIENUNGSANLEITUNG LASER KLASSE 4 LASER CLASSE 4 DANGER RAYONNEMENT LASER VISIBLE ET OU INVISIBLE EXPOSITION DANGEREUSE DE L OEIL OU DE LA PEAU AU RAYONNEMENT DIRECT OU DIFFUS CONSULTER LE MANUEL D INSTALLATION LASER CLASSE 4 808 7098 CE Warning Label Interlock Defeated 9 Figure 2 6 CE CDRH Warning Labels 2 10 808 7097 CE Warning Label Power Supply 10 Label Translations Laser Safety 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 previous page Table 2 1 Label Translations Label French German Spanish Dutch Sichtbare und oder unsichtbare Danger Label 2 Rayonnement Laser Visible et ou Invisible and en Cas D Ouverture Laserstrahlung wenn Interlocked et lorsque la securit ge ffnet und Cover Label est neutralis e Sicherheitsverrie 3 exposition gelung berbruckt dangereuse de l oeil Bestrahlung von ou de la peau au Augen oder Haut rayonnement direct durch direkt oder ou diffus Laser de Streustrahlung Classe 4 vermeiden Laser Klasse 4 Aperture Label Exposition Austritt von sichtbarer 4 Dangereusel und unsichtbarer Rayonnement visible Laserstrahlung et ou invisible est Bestrahlung emis par cette vermeideni ouverture Danger Label Visible et ou invisible Sichtbare und oder Outpu
33. aded with LabVIEW software that uses an RS 232 serial interface to control and monitor the functions of the laser Although the particular computer delivered with each laser may vary it is specified to have a high speed CPU 2 256 MB of RAM 10 GB hard drive a CD ROM drive a floppy drive Windows XP Home Edition operating system The control software for the Evolution 30 is pre installed on the laptop and tested with the laser A copy of this software is delivered on floppy disk or CD ROM The Closed Loop Chiller 1 2 A small closed loop chiller is provided to dissipate waste heat In addition 1t is part of the sub system that stabilizes the wavelength of the diode lasers to ensure maximum absorption of the pump light in the gain medium The chiller has two hoses with quick release connectors and a pressure regulator valve to reduce the water pressure at the laser head A chemical additive in the distilled water coolant prevents algae growth and corrosion The functions of the system and its components are described in detail in Chapter 3 System Overview LabVIE W is a registered trademark of National Instruments Windows XP is a registered trademark of Microsoft Chapter 2 Warning W Danger Laser Radiation Hazards Laser Safety This user information is in compliance with Section 1040 10 of the CDRH Laser Products Performance Standards from the Health and Safety Act of 1968 Use of controls or adj
34. anel A Danger Y 5 2 O Evolution 30 _ _ _ gt gt O LASER ACTIVE as sme OUT RS SG POWER Au LASER FAULT o ON EXT QS TRIG IN LBO HEATER CONTROL TIL High Power Diode Pumped Nd YLF Laser System Figure 5 1 The Power Supply Front Panel POWER switch enables main ac line voltage to the power supply The switch illuminates when power is turned on AC line voltage to the LBO crystal heater circuit in the power supply is always present when the power supply is plugged in even when the ac breaker is deactivated Keyswitch the OFF position prevents operation of the laser and removal of the key is possible only in the OFF position The keyswitch is also used to reset latched interlocks by cycling the switch from OFF to ON LASER ACTIVE LED illuminates when current is flowing through the diode laser arrays regardless of the state of the laser output Q svvitched cw hold off etc LASER FAULT LED flashes when the Evolution 30 encounters an inter lock fault LBO HEATER CONTROL is a controller that is programmed to maintain the temperature of the LBO crystal oven Normally it is not necessary to change the settings of this controller RS232 I O connector 25 socket D sub provides RS 232 serial control of the system by a host computer QS SYNC OUT connector BNC provides a fixed TTL signal out that is synchronized w
35. bree feel dh lewd Hae ane deb a Seen da een 5 4 SYSTEM Pangl gege ee ac Cee asic hark ee Sad od Sara nana ak aie wh eee eens 5 5 FAULT Panel 2 ven sh Dee eos eh moe hs heey wen EEN 5 6 ERROR EOG Panel ass a dares ee rer Es ER me ata era 5 8 FACTORY Panel at ad n faute ak Ak anced felt date fede ue OOS E mee hd 5 8 Start up Procedure 2 526 pak peed ae tha bey a BoA ghee AA ag ah BB an BR ea ee eee dee 5 8 system Shutdown ii ir rs AA gedaan EE Satine NC 5 9 Long Term SHUtdOWN jc fa mesi ang aa a ahs er ee ng ea 5 9 viii Table of Contents Chapter 6 Maintenance 6 1 Lasing Optimizations ij sim dota e e a EEN 6 1 Cavity Mirror Adjustments 6 1 LBO Crystal Temperature Optimization a a aaa tee 6 3 Cleaning the Optics 2 1 Gi EE o aa e aa a ER AA NA n et 6 4 Routine Maintenance Cooling Water 6 6 Chapter 7 Troubleshooting and Customer Service 7 1 Troubleshooting Guide 7 1 Symptom Laser will not start 7 1 Symptom Emission light comes on but no output 7 2 Symptom Variations in output power 7 2 Symptom Power is below specification 7 3 Symptom Laser does not emit Q switched or CW output 7 3 TEE 7 4 Warranty EEN 7 4 Return of the Instrument for Repair ada 7 4 Service Centers iii re we Ne ee e
36. ctioning or misaligned Contact your authorized service representative Symptom Power is below specification Troubleshooting and Customer Service Possible Cause Corrective Action Diode current is set too low Q switch frequency is set higher or lower than 1 kHz Cavity optics are out of alignment LBO crystal temperature has drifted Algae growth is present in the cooling water Diode laser power is low Verify the expected output power levels for the Low Medium and High settings Power output depends on Q switch frequency If operating the Evolution 30 at a different Q switch frequency than specified contact Spectra Physics for the power specification at that particular frequency Adjusting the cavity mirrors slightly may opti mize the output power Read the detailed instructions in Chapter 6 Maintenance before attempting to adjust the mirrors At low pump power check the output power across the 3 degree tuning range of the LBO crystal for the highest output power Follow the maintenance procedure in Chapter 6 After several thousand hours of operation the optical power of the diode lasers decreases and the current to the diodes must be increased to compensate Contact your ser vice representative Symptom Laser does not emit Q switched or CW output Possible Cause Corrective Action External Q switch input is not valid QSW MODE is set to CW RF OFF QSW BN
37. e once again closed and the keyswitch is cycled to clear the interlock function For example the interlock connector can be connected to a switch on the door to the laser room that terminates laser action automatically if anyone enters the room To connect the interlock switch remove the external jumper plug and either rewire it according to the wiring diagram in Figure 2 2 or use a similar con nector Wire the external switch normally closed so that when the door or safety device opens the switch opens turning off the diode lasers and preventing accidental exposure to laser radiation The laser beam path is contained within the mechanical housing of the laser head until it exits at the front or side output port The laser pump chamber is also contained within this housing to shield the user from stray diode laser light and to protect the diode lasers from exposure to dust and electrostatic discharge Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Cover Safety Interlocks A Danger Y Beam Safety Shutter Interlock cover switches ensure that the Evolution 30 laser head cannot be operated if the metal optical cavity cover is not in place and in the Scien tific version if the external sheet metal cover is not in place Do not operate the Evolution 30 with any of its covers removed except when necessary during required service Removing covers may expose personnel to hazardous voltages and radiation It also
38. e proceeding to the Start Up Procedure later in this chapter Electrical Current Settings The Evolution 30 laser comes with a set of performance data that lists the factory measured output power as a function of diode laser current at the nominal Q switch repetition rate that was specified when the laser was ordered Your authorized service representative will verify these measure ments when the laser 1s installed It is useful to establish at least three nominal current settings Low Medium and High for example 15 A 20 A and 25 A that produce for example 6 W 15 W and 20 W for a standard 1 kHz system This section will refer to these settings as Low Medium and High If the Evolution 30 is not operated at its maximum specified output power scale these settings appropriately when following the procedures in this chapter or when following any troubleshooting procedures After several hundred hours of operation the diode laser output power will decrease slightly This is a normal burn in period The maximum possi ble current is set at the factory to ensure that the laser will meet its specified power for thousands of hours of operation 5 1 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Povver Supply The povver supply contains the smart analog pc board SAB the diode power supply the O switch RF driver the LBO crystal temperature con troller and other control electronics Povver Supply Front P
39. earing the interlock faults 9 Set the CURRENT SETTING on the Control Software screen to the nominal Low setting 5 8 10 System Operation If the Evolution 30 is to be internally Q switched set the QSW FREQUENCY control to the proper repetition rate e g 1 0 kHz and set the QSW MODE switch to INTERNAL repetition rate Operating the laser at a significantly different rate may Caution pl Your Evolution 30 was optimized at a user requested specific Q switch result in decreased performance or damage to the instrument 11 12 13 14 15 If the Evolution 30 is to be externally Q switched attach a TTL level signal at least 2 5 us duration at the proper frequency to the EXT QS TRIG IN connector on the front panel of the power supply and set the QSW MODE to EXTERNAL Q switch operation is synchronized to the rising edge of the input pulse Rotate the output shutter on the front or remove the plug from the side of the Evolution 30 depending on which port is being used to the open position Verify laser output will be directed into an appropriate termination e g beam dump power meter Spitfire etc Slide the Laser State control on the Control Software screen to the RUN position The LASER ACTIVE LED on the power supply will turn on as will the LASER ACTIVE indicator on the Control Software screen The CURRENT MONITOR will display the set point level in approximately 5 seconds Please note t
40. ecified to have a high speed CPU 2 256 MB of RAM 10 GB hard drive a CD ROM drive a floppy drive Windows XP Home Edition operating system The control software for the Evolution 30 is pre installed on the laptop and tested with the laser A copy of this software is delivered on floppy disk or CD ROM The Evolution 30 was built and tested using the control computer and control software shipped with the laser Use of any other computer or software for this purpose may cause damage to the laser and may also void the warranty The control computer is connected to the Evolution 30 power supply using the DB 9F to DB 25M serial modem cable By default the software uses the COM1 serial connection on the laptop computer corresponding to the built in serial port The Evolution 30 Control software is accessed by a shortcut in the Start menu program folder The exact layout of the front panel varies depending on the software version but all versions share the same general controls The latest version of the software is always available from Spectra Physics Some laptops provided with the Evolution 30 system do not have serial ports A USB to serial adapter is provided with these laptops LabVIE W is a registered trademark of National Instruments Windows XP is a registered trademark of Microsoft Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Performance Specifications The table below lists perf
41. ee e A ana nal eels 7 5 Appendix A OptiShield Algaecide A 1 Filling the Chiller for First Time Use e teens A 1 Periodic Changing of Solution A 2 MSDS Sheet for Optishield A 3 Notes Report Form for Problems and Solutions List of Figures Figure 2 1 System Safety Features on the Front Panel 2 4 Figure 2 2 External Interlock Connector on the Rear Panel 2 5 Figure 2 3 CE CDRH Radiation Control Drawing Scientific Version 2 7 Figure 2 4 CE CDRH Radiation Control Drawing OEM Version 2 8 Figure 2 5 CE CDRH Radiation Control Drawing Power Supply 2 9 Figure 2 6 CE CDRH Warning Labels 2 10 Figure 3 1 Acousto Optic Modulation 3 2 Figure 3 2 Laser Head Optical Layout 0 3 4 Figure 4 1 Evolution 30 Scientific Laser Head Outline Drawing 4 5 Figure 4 2 Evolution 30 OEM Laser Head Outline Drawing 4 5 Figure 4 3 Evolution 30 Power Supply Outline Drawing 4 6 Figure 5 1 The Power Supply Front Panel aa 5 2 Figure 5 2 The Power Supply Rear Panel 5 3 Figure 5 3 Evolution 30 Control Software 5 4 Figure 5 4 The Control S
42. er Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Power Supply A Danger Y The power supply assembly consists of a rugged steel frame in a 19 in rack mount configuration The power supply contains the master control board diode power supply Q switch RF driver LBO crystal temperature controller and other control electronics In general 1t should not be neces sary to access any components inside the power supply Potentially lethal voltages and currents are contained in the power supply Removing the power supply cover will expose these hazards Normal operation of the Evolution 30 does not require access to the power supply circuitry Contact an authorized service representative before attempting to correct any problem with the power supply Smart Analog PC Board The master control pc board or Smart Analog Board SAB is a micro processor controlled system for setting and monitoring the diode laser power supply laser interlocks and Q switch driver It is controlled by soft ware on the supplied computer through the RS 232 serial interface Diode Laser Power Supply Q Switch Driver The diode laser power supply which is controlled and monitored by the SAB is a self contained unit enclosed in a metal housing The housing pro tects both service personnel and the components in the power supply The Q switch driver provides RF power to the Q switches in the laser head It is an all solid state elect
43. form a pad approximately 1 cm wide 2 Hold the pad with the hemostat so that about 3 mm of the folded edge protrudes from the hemostat 3 Saturate the pad with methanol or acetone and shake to remove excess solvent 4 Reach slightly below the center of the optic and wipe the surface of the optic toward the outside in one motion Be careful that the hemostat does not touch the optic or the surface will be damaged 5 If cleaning the intracavity dichroic mirror repeat this operation using a clean tissue on the other optical surface Q Switch The Q switch can be difficult to clean attempt to clean it only if dust or debris are clearly visible When cleaning the Q switch crystal faces it is necessary to remove the U shaped cover around the Q switch in order to gain unobstructed access to the quartz faces Do not touch the transducer connections 6 5 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Routine Maintenance Cooling Water A Danger Y Caution I To prevent metal corrosion and growth of algae in the Evolution 30 closed loop cooling water system OptiShield corrosion inhibitor is recom mended This chemical treatment prevents galvanic corrosion from dissim ilar metals prevents oxidation of ferrous metals and acts as an effective algaecide The first application of OptiShield is normally performed at the factory and a similar application will be repeated during system installa tion Thereafter
44. gital meter display of diode current in amps EXIT and SAVE SETTINGS button stops the laser if 1t is running stops the execution of the control program and saves the settings The inset panel contains the display choices SYSTEM FAULT ERROR LOG and FACTORY which are selected by tabs so labeled The panels associated with each of choices are described below SYSTEM FAULT ERRORLOG FACTORY ELAPSED TIME Q SWITCH MODE EXTERHAL INTERNAL SS HOLD OFF CW RF OFF QSW FREQUENCY kHz QSW PULSE WIDTH uS so Software version 2 4 2 February 2002 Figure 5 4 The Control Software SYSTEM Panel QSW MODE control sets the mode of the Q switch driver and the indica tors that show the active Q switch mode EXTERNAL RF power on Q switch trigger source is the EXT QS TRIG IN BNC on the front panel of the power supply The external trig ger frequency must be gt 500 Hz or the laser will interlock 5 5 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Caution FAULT Panel INTERNAL RF power on Q switch trigger source is the internal clock on the SAB repetition rate set by the software QSW Frequency control HOLD OFF RF power on no Q switch triggers It is used to check alignment of the Q switches during servicing of the laser CW RF OFF Continuous wave RF power off It is used for setting and checking laser cavity alignment during servicing of the laser Changing from no
45. hat 1t takes the chiller about 15 minutes to stabilize the temperature of the laser head cold plate and thus the output of the laser If the laser is used frequently leaving the chiller on between periods of use will eliminate or greatly reduce this stabilization period If the laser is used infrequently turn off the chiller between periods of use Measure output power with a power meter capable of measuring 30 Watts minimum Within several minutes the 527 nm power should be the same as or close to the power that was previously measured at the Low current setting Manually increase the current setting at a rate of no more than 1 amp per second until the Medium current setting is reached Monitor the power continuously as you make this adjustment to ensure that the power increases monotonically with the current If output power is low wait 10 minutes for the laser temperature to stabilize Once the power reaches the Medium current setting increase the current to the High setting and verify the power again If the beam does not reach Operating power it may be necessary to optimize the lasing output as described in Chapter 6 Maintenance 5 9 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser System Shutdown Long Term Shutdown 5 10 See ES Click the STOP button on the Control Software screen The shutter will close and the diodes will shut off immediately Close the Control Software window Turn the keyswitch
46. he diode laser arrays are activated and the LASER ACTIVE indicator comes on The diode laser arrays begin a con trolled ramp up to allow time for the doubling crystal to maintain operating temperature The RAMPING and COUNT DOWN indicators appear on the screen display After a delay of 5 seconds during which time a tone sounds the Evolution 15 begins to lase The RAMPING and COUNT DOWN indicators on the screen display turn off and the emission LED on the power supply and the RUN indicator on the screen turn on In the STOP state the Evolution 30 stops lasing the diodes are turned off and the internal shutter in the laser cavity is closed When the laser is turned on for the first time after the power supply has been cycled it initially defaults to the STOP state SYSTEM Panel System Operation RUN STOP FAULT COUNT DOWN indicators are described above under Run Stop control KEY SWITCH shows the state of the access control key It is illuminated if the key is in the OFF position and flashes if the keyswitch needs to be recy cled to reset the Fault State LASER ACTIVE indicator turns on when current is supplied to the diode lasers CURRENT SETTING A control is a numeric control that allows setting of the diode lasers output current in amps up to the factory maximum set point The numeric value can be entered directly or in 0 1 A steps using the adjacent buttons CURRENT MONITOR A meter is a di
47. he laser are protected from accidental or unnecessary exposure to laser radiation exceeding the acces sible emission limits listed in Performance Standards for Laser Products United States Code of Federal Regulations 21CFR1040 10 d The follovving safety precautions are to be observed at all times Wear protective eyewear at all times selection depends on the vvave 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 ACGIH or OSHA standards listed at the end of this section for guidance Avoid wearing jewelry or other objects that may reflect or scatter the beam while using the laser Work in high ambient illumination This keeps the eye s pupil con stricted thus reducing the possibility of eye damage Never look directly into the laser beam Avoid looking at the beam even diffuse reflections are hazardous Use an infrared detector to ascertain whether the laser beam is on or off before working on the laser Work with the lowest beam intensity consistent with the application Operate lasers only in well marked areas with controlled access Be sure to post appropriate warning signs clearly visible Limit access to the laser system to qualified personnel who are essen tial to its operation and who have been trained in the safety principle
48. hen guide you through its installation and operation The last part of the manual covers service and includes a replacement parts list and a list of world wide Spectra Physics service centers you can call if you need help 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 Spectra Physics for warranty repair This product has been tested and found to conform to Directive 89 336 EEC for Electromagnetic Compatibility Class A compliance was demon strated 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 com pliance 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 CE Declaration of Conformity in Chapter 2 Laser Safety This product conforms to the requirements of 21 CFR 1040 10 CDRH and is compliant to Underwriters Laboratory UL1950 and is listed as ULR for recognized components This equipment has been designed and tested to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules Evolution 30 Intracavi
49. igure 2 3 Figure 2 4 and Figure 2 5 are present and firmly affixed in the correct locations Verify that removing the INTERLOCK connector on the rear panel of the power supply prevents operation of the laser Verify that the time delay between illumination of the emission indica tor and start of laser emission gives enough warning to allow personnel to avoid exposure to the radiation Verify that the internal beam attenuator shutter a operates properly when the laser is turned off from the computer controller b closes when the keyswitch is turned off and blocks access to laser radiation Laser Safety CE Declaration of Conformity We Spectra Physics 1330 Terra Bella Avenue Mountain View CA 94043 United States of America declare under our sole responsibility that the Evolution 30 diode pumped intracavit doubled Nd YLF laser system with power supply and compliant pc based controller and Neslab or Lytron chiller manufactured after July 1999 to which this declaration relates is in conformance with the provisions of Directive 73 23 EEC governing product safety using the following standards EN 60950 1997 EN 61010 1 2001 EN 60825 1 1994 the provisions of Directive 89 336 EEC governing electromagnetic compati bility using the following standards EN 61326 1 w A1 1997 I the undersigned hereby declare that the equipment specified above con forms to the above Directives and Standards Bruce Craig Vice
50. iller with the filter and hoses already attached The chiller is strapped to the base of the crate Remove the straps and carefully lift the chiller off the base of the crate DO NOT lift the unit by the filter or its connecting fixtures s This Evolution 30 User s Manual e Laptop computer e One or more beam tube s e 4 adjusting feet for the laser head installed e A set of Allen head drivers e Serial and power cables for the laptop computer e Power supply power cable e Optishield corrosion inhibitor algaecide e Power supply interlock jumper and keys e Spare chiller filter OptiShield is a registered trademark of Opti Temp Inc Chapter 1 The Laser Head N Caution L Introduction The Evolution 30 is an intracavity doubled diode pumped Nd YLF laser with green output at 527 nm The Q switched output is pulsed at user controlled repetition rates that are typically between 1 and 10 kHz By using an internal removable mirror the user can elect to have the laser beam exit the Evolution 30 either through the front or side panel of the laser head The system is controlled via convenient interface software installed on the laptop computer that is supplied with the system The Evolution 30 system comprises four main elements e Evolution 30 laser head e Power supply e Laptop computer and interface software e Closed loop chiller The laser head is a sealed aluminum chassis that contains the following components e D
51. iode pumped laser chamber e Optical resonator assembly e Two acousto optic Q switches e Frequency doubling crystal and temperature controlled oven e Safety shutter The Evolution 30 was designed to provide optimum performance with minimal user intervention Normal operation should not require the laser head cover to be opened Removing the laser head cover without prior authorization will void the warranty The Evolution 30 is available in two versions OEM and Scientific The aluminum chassis of the scientific version is mounted in an external housing with an emission indicator and four mounting feet that allow for beam height adjustment The OEM version does not include this external housing thus minimizing its footprint and allowing simpler integration of the Evolution 30 with other instruments 1 1 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser The Povver Supply The povver supply contains the electronics required to drive the diode lasers stabilize the temperature of the doubling crystal Q switch the laser and monitor the interlocks The power supply connects to the laser head through a removable 3 meter long umbilical cable The power supply contains the following components e Master control electronics e Diode laser power supply e Doubling crystal temperature controller e O switch driver e Accessory electronics The Control Computer The Evolution 30 comes with a commercial laptop computer pre lo
52. ion contains the material safety data sheet supplied by the vendor of the algaecide used in the Evolution 30 closed loop cooling system Please read this information before handling or disposing of this chemical or any cooling water containing it This information does not pertain to and may not be appropriate for larger quantities of the chemical than those described The product is intended for use by personnel with sufficient technical skill and qualification to use the material correctly and who understand the risks involved in handling any potentially hazardous chemical able and accurate but has not been verified independently by Spectra Physics Accordingly no representation or warranty expressed or implied with respect to merchantability and fitness for a particular pur pose is made in this data sheet For further information contact the man ufacturer at the address listed Warning W This information obtained from the manufacturer is believed to be reli Caution Use only STEAM DISTILLED water in the Evolution 30 cooling sys tem The use of de ionized water may cause corrosion damage Filling the Chiller for First Time Use 1 Flush the cooling circuit with distilled water 2 The chiller reservoir has a 2 gallon capacity Fill it with 1 pint of Optishield fluid and the remaining volume 15 pints with steam dis tilled water 3 Circulate this solution for about 30 minutes Drain the fluid Do not rinse
53. ith the triggering of the Q switch EXT QS TRIG IN connector BNC triggers the Q switch externally when a TTL signal capable of driving a 50 Q load is applied External triggering from 500 Hz to 10 kHz is possible This mode requires the selection of EXT mode in the control software System Operation Power Supply Rear Panel O RF Out RF Out O O oo eem el Ua CI Note Figure 5 2 The Povver Supply Rear Panel AC IN connector provides connection for the main input power source either 110 Vac 10 50 60 Hz or 220 Vac 10 50 Hz Use the fuse size listed in Table 5 1 Table 5 1 Evolution 30 Fuse Specifications Line Voltage Vac F1 F2 3AG Slow Blow 200 240 10A 10A 100 120 15A 15A RF OUT connectors BNC output 30 watts each 100 150 Vrms sine wave at 27 11 MHz into a 50 2 load to drive the two Evolution 30 Q switches DO NOT connect these signals to anything other than the BNC connectors present in the Evolution 30 laser head umbilical 26 pin connector unlabeled supplies interlock and control signals to the laser head Connects to the 26 pin umbilical cable 4 pin connector unlabeled supplies current to the diode laser arrays in the laser head Connects to the 4 pin umbilical cable INTERLOCK connector 3 pin is used to interlock the laser via a con trolled access point such as a laboratory door Pins J and J shown in
54. ium Hydroxide 1 2 Phosphoric Acid lt 1 5 Triazole lt 2 5 The Hazardous Materials Index Rating is as follows Health 1 Flamability 0 Reactivity 1 SECTION Il Physical Data Volatiles Nil Color Light Golden Yellow Odor Mild Specific Gravity 1 03 Solubility 100 in water pH of 100 solution concentrated 11 to 12 typical 11 5 SECTION Ill Fire and Explosion Hazard Non Flammable Flash Point Unknown SECTION IV Reactivity Data Stability Stable Polymerization None Exposure to Other Chemicals Keep away from concentrated acids Reactivity in Water None A 3 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser A 4 Page 2 of 2 SECTION V Shipping Information Regulation This material is not a DOT regulated material This product is a freezable liquid when and where applicable SECTION VI Spill Small spills Small spills may be soaked up using common absorbent material and using appropriate safety equipment Dispose of and handle in accordance with local state and federal regulations Large spills Large spills should be pumped into suitable containers located in diked areas Residual material should be cleaned up with water Dispose of and handle in accordance with local state and federal regulations SECTION VII First Aid Ingestion Give milk or water induce vomiting get medical attention Skin Flush with fresh water wash with soap and water Remove contaminated clothes and sh
55. laced is warranted only for the remaining original warranty period This warranty is in lieu of all other warranties implied or expressed and does not cover incidental or consequential loss 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 any instrument or component not manufac tured by Spectra Physics When products manufactured by others are 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 is extended only to the equipment manufactured by Spectra Physics This warranty does not apply to equipment or components that upon inspec tion by Spectra Physics discloses to be defective or unworkable because of abuse mishandling misuse alteration negligence improper installation damage in transit or other causes beyond the control of Spectra Physics Return of the Instrument for Repair 7 4 Contact your nearest Spectra Physics field sales office service center or local distributor for shipping instructions or for an on site service appoint ment You are responsible for one way shipment of the defective part or instrument to Spectra Physics We encourage you to use the original shipping boxes If the original boxes have been destr
56. lacement and spacing requirements CE Electrical Equipment Requirements For information regarding the equipment needed to provide the electrical service please refer to specification EN 309 Plug Outlet and Socket Couplers for Industrial Uses listed in the official Journal of the European Communities Environmental Specifications FCC Regulations 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 I Pollution degree 2 This equipment has been designed and tested to comply vvith the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equip ment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense Modifications to the laser system not expressly approved by Spectra Physics could void your
57. lier in this chapter The Evolution 30 is assembled with chemically cleaned parts To prevent contamination wear plastic gloves or finger cots while working inside the housing Materials required Safety goggles Clean plastic gloves or finger cots Lens cleaning tissue Kodak brand or equivalent quality Reagent grade methanol or acetone Eye dropper Hemostat surgical pliers English hex wrench set Bright lamp or flashlight Maintenance Danger The LBO crystal is kept above 320 F 160 C Prolonged contact with the LBO crystal housing can burn skin melt plastic and ignite flam mable material Warning Never attempt to clean the LBO crystal or the Nd YLF laser rod in this W system Optical damage will occur and warranty will be voided if either of these two optics have been tampered with If you feel that optical damage has occurred or cleaning of these optics is necessary contact your authorized Spectra Physics service representative Accessing the Evolution 30 optics 1 Turn off the Evolution 30 power supply 2 Scientific version only Remove the external sheet metal cover 3 Remove the screws holding the machined metal cover in place and put the screws in a safe place 4 Remove the machined cover and place it on a clean surface Mirrors Mirrors should be carefully cleaned with soft optical tissue and reagent grade methanol or acetone 1 Fold a piece of lens tissue repeatedly to
58. llow the temperature to return to spec ified temperature range before turning on the system again QSW LOW FREQ LED turns on when the QSW MODE is set to EXTER NAL and the external source of triggering drops below 500 Hz Ensure that the source of external Q switch triggering is producing TTL pulses at 500 Hz or higher QSW VSWR LED turns on when either or both of the QSW RF connectors on the back of the power supply are disconnected QSW TEMP LED turns on when the thermal sensor in either AOM exceeds the safe operating temperature for that device Verify the chiller is functioning properly and that water pressure and reservoir level are correct and that the water hoses are not kinked to ensure adequate flow then cycle keyswitch to clear the fault COMM ERROR LED turns on when communications are interrupted between the computer and the power supply Check the serial cable connec tions and verify the power supply is turned on Exit the Control Software cycle ac power on the power supply then restart the Control Software to clear the fault DRIVER TEMP LED turns on when the temperature of the diode driver FET heat sink becomes overheated due to inadequate airflow to the driver or to a shorted or over current condition Verify airflow in the power supply is adequate and allow the system to run without lasing for at least 10 minutes to cool it down then restart the laser DIODE TEMP LED turns on when the temperature sens
59. mplies non critical phase matching is much less sensitive to the alignment of the crystal than other phase matching schemes Lithium triborate LBO is a nonlinear optical crystal characterized by a relatively high optical damage threshold and a moderate nonlinear optical coefficient as well as excellent material properties LBO s small birefrin gence allows for non critical phase matching and provides a larger accep tance angle for high efficiency frequency conversion The crystal must be heated and temperature stabilized to maintain good conversion efficiency Laser Head Configuration The laser head of the Evolution 30 is shown in Figure 3 2 The laser reso nator is a folded design which reduces the overall size of the Evolution 30 while simultaneously providing for efficient output coupling of the second harmonic light The laser resonator contains the following components 1 Nd YLF curved high reflecting HR mirror This forms one end of the laser resonator 2 AS turning mirror used to decrease the size of the laser head foot print 3 The first AOM Q switch described below 4 Diode laser pumped Nd YLF laser chamber described below 5 Intracavity safety shutter 6 Curved intracavity mirror used to shape the beam inside the Nd Y LF rod Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser C
60. n Q switching modes CW and HOLD OFF to lasing modes INTERNAL and EXTERNAL while the laser is running will cause the laser to switch to Stop mode When this happens restart the laser by simply switching to Run mode QSW FREQUENCY kHz control sets the frequency of the internal Q switch trigger source QSW PULSE WIDTH us control sets the width of the internal trigger pulse to the Q switch driver ELAPSED TIME display shows the cumulative hours and minutes of laser operation SYSTEM FAULT ERRORLOG FACTORY COVER USER DRIVER TEMP FLOW DIODE TEMP LBO TEMP OVER VOLTAGE QSW LOW FREQ OVER CURRENT Qsw VSWR OVER POWER QSW TEMP PROT FAULT COMM ERROR CHECKSUM ERROR Figure 5 5 Control Software FAULT Panel COVER USER LED turns on when any of the micro switches on the laser head are not engaged or when the user interlock is open Verify the covers are closed or that the interlocks are defeated on the laser head and that the door interlock switch is closed or interlock defeated then cycle the key switch to clear the fault System Operation FLOW LED turns on when chiller water flow is less than 2 0 GPM Ver ify the chiller is functioning properly and that water pressure and reservoir level are correct and that the water hoses are not kinked to ensure adequate flow then cycle keyswitch to clear the fault LBO TEMP LED turns on when the LBO temperature is outside a preset range around the factory set point A
61. n be accessed Note that when this lamp is on diode laser light is present inside the housing even though the laser cavity may not be emitting green or infrared laser radiation for example when the laser is in Hold Off mode Fault Indicator Laser Safety e OEM Evolution 30 A detachable emission indicator supplied with the laser can be mounted on the laser head or post mounted in a remote location This indicator functions in the same way as the permanent indicator on the Scientific Evolution 30 To comply with CDRH requirements 1t must be placed in a clearly visible location no more than 10 feet 3 m from the Evolution 30 output port This indicator is required when the OEM Evolution 30 is installed in an instrument and an indicator on the laser head is not clearly visible All emission indicators remain on as long as the laser is capable of lasing They illuminate a few seconds prior to actual emission to give nearby per sonnel time to avoid exposure When the LASER FAULT indictor turns on for safety turn off the laser and determine the source of the fault before continuing laser use Remote Interlock Connector Protective Housings Figure 2 2 External Interlock Connector on the Rear Panel The remote INTERLOCK connector on the back of the power supply is used to connect an external CDRH interlock This interlock when opened causes the diode pump lasers to turn off Lasing can resume only after these contacts ar
62. n in Figure 2 3 and Figure 2 4 respectively Locations of the labels for the power supply cabinet are shown in Figure 2 5 and the labels themselves are shown in Figure 2 6 Translations of the warning labels are provided in Table 2 1 for non English speaking users The number in parentheses in the first column cor responds to the label number in the diagram Laser Safety CE CDRH Drawings Labels are on page 2 10 Rear View Top View OI Gara o g a Right Side View o A O LO zu o e 0 7 LA ZN O Left Side View Figure 2 3 CE CDRH Radiation Control Dravving Scientific Version 2 7 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Figure 2 4 CE CDRH Radiation Control Drawing OEM Version 2 8 Top View Right Side View O d L
63. nditions fault corrections and their time stamps FACTORY Panel The controls available under this tab are reserved for use in the factory Do not use them Start Up Procedure Follow these procedures when starting and operating the Evolution 30 laser system Eyewear A The following procedures will result in laser emission from the Required Evolution 30 output port Ensure that all persons in the room are wearing adequate eye protection Also ensure that the anticipated beam is safely terminated into a high power beam block or power meter 1 Verify the power supply chassis is plugged in and the umbilical cables are connected properly 2 Verify that the LBO Heater Control temperature is at the proper factory set temperature 3 Turn on the chiller Verify the control cable is connected between the computer and the power supply Boot the control computer and log in if necessary Turn on the power supply power switch Insert the key in the keyswitch and turn it to the ON position a ON Start the Evolution 30 control software After the Control Software begins communicating with the Evolution 30 and all interlocks are closed the STOP indicator on the Control Software screen will turn on indicating that the laser can be started If the FAULT indicator on the power supply flashes or the FAULT indi cator on the Control Software screen is on refer to the Troubleshoot ing Guide in Chapter 7 for help in cl
64. nsure that any air is purged upward and out of the laser head Connecting the chiller hoses in reverse would trip a flow interlock Danger Before handling the OptiShield water treatment chemical read Appen AN Y dix A OptiShield Additive which describes the potential hazards of this substance and has instructions for its use This chemical can be harmful if swallowed inhaled or absorbed through the skin or eyes Caution Use only STEAM DISTILLED water in the Evolution 30 cooling system The use of de ionized water may cause corrosion damage Mechanical Specifications Table 4 2 Component Weights Component Weight Laser Head Scientific 63 0 Ib 28 6 kg Laser Head OEM 55 0 Ib 25 0 kg Power Supply 46 0 Ib 20 9 kg Chiller dry typical 122 Ib 55 kg System Installation CI SS 124 0 181 4 EL E E 1 31 9 00 2 38 19 00 333 228 6 gt 603 e 483 0 gt 11 62 al 0 65 24 00 295 1 16 5 610 0 Dimensions given in inches mm Figure 4 1 Evolution 30 Scientific Laser Head Outline Drawing 3 00 0o51 jj 76 2 13 0 N O IE Z o S Ll e e J l
65. oes Eyes Flush with fresh water for at least 15 minutes Get medical attention Inhalation Inhalation should not occur during normal operation However should it occur close container and move to well ventilated area If irritation persists get medical attention SECTION VIII Special Instructions Do NOT pressurize container Keep container closed at all times when not in use Store in cool area above 60 F Do not allow fluid to freeze Use in well ventilated area Do not breathe mist or vapor Wash hands thoroughly after handling product Protect eyes with safety goggles or glasses with side shields Notes Notes 1 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Notes 2 Notes Notes 3 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Notes 4 Notes Notes 5 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Notes 6 Report Form for Problems and Solutions We have provided this form to encourage you to tellus 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 vve appreciate all suggestions Thank you From Name Company or Institution Department Address Instrument Model Number Serial Number Problem
66. oftware SYSTEM Panel 5 5 Figure 5 5 Control Software FAULT Panel 5 6 Figure 6 1 Access to End Mirror Adjustment Screws 6 2 List of Tables Table 2 1 Label Translations 24 22 48 oda vetoes lee edhe Der eee Ld ees 2 11 Table 3 1 Specifications Evolution 80 3 8 Table 4 1 Utility Requirement for the Evolution 30 4 2 Table 4 2 Component Weights ea aa aa aaa aa aa aaa eaaa aaa 4 4 Table 5 1 Evolution 30 Fuse Specifications 5 3 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Danger Laser Radiation Danger A Danger Warning Warning ESD A Cautioni Note Don t Touchi Eyevvear Required Uy Y ty Y ly E AN VVarning Conventions The following vvarnings are used throughout this manual to draw your attention to situations or procedures that require extra attention They warn of hazards to your health damage 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
67. or mounted in the laser pump chamber exceeds the safe operating temperature Turn off the power supply and allow the chiller to run for 10 minutes to cool it down verify proper chiller temperature then restart the laser running it at a lower diode laser drive current OVER VOLTAGE LED turns on when the voltage required to supply the requested current to the diodes exceeds the factory set limit Check the diode umbilical connection and cycle power on the power supply to clear the fault OVER CURRENT LED turns on when the current requested to drive the diode array exceeds the factory set limit Lower the current drive setting then cycle power on the power supply to clear the fault OVER POWER LED turns on when the internal drive FET exceeds a factory set power limit Reduce the diode drive current then cycle the power on the power supply to clear the fault PROT FAULT LED turns on when the internal drive FET protection cir cuit is activated This is a serious internal driver failure that requires repair Warning W Do not operate the Evolution 30 if a PROT FAULT error occurs 5 7 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser CHECKSUM ERROR LED turns on when a garbled communications message is detected between the Control Software and the Evolution 30 Normally these can be ignored but if they occur frequently check the RS 232 cable connections ERROR LOG Panel This window displays all the fault co
68. ore installation please select a suitable location for the Evolution 30 Spectra Physics recommends the laser be located in a laboratory type envi ronment that is free from dust and drafts with low humidity lt 50 and has temperature fluctuations less than 5 C Pumping a Spitfire Amplifier Required Utilities Warning Dy If used to pump a Spitfire amplifier the Evolution 30 should be placed rel atively close to the Spitfire The optimal distance between the two units is determined at the factory during the final test procedure Deviations of greater than 6 inches from this distance can affect the overall performance of the system Also for safety reasons it is inadvisable to allow an exposed laser beam to travel a long distance Please consult with your authorized service representative 1f necessary Do not apply ac line power to the power supply Doing so will activate the LBO crystal heater Any improper programming of the crystal heater and subsequent crystal heating will permanently damage the crystal Such damage is not be covered under the warranty Installation of the Evolution 30 laser should be performed by a service engineer 4 1 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Warning W The closed loop chiller supplied with your Evolution 30 is only compat ible with a specific line voltage and frequency range Do not attempt to operate the chiller at a different voltage or frequency under any
69. ormance specifications for the Evolution 30 laser system The environmental specifications are listed in the front of this man ual Utility requirements and mechanical specifications are listed in Chap ter 4 System Installation Table 3 1 Specifications Evolution 30 Output Characteristics 1 kHz 5 kHz Energy per Pulse 20 mJ 6 0 mJ Beam Diameter 3 mm nominal Energy Stability 1 RMS Polarization Linear horizontal Transverse Mode Mulitmode VVavelength 527 nm Repetition Rate 1 to 10 kHz 1 Due to our continuous product improvement program specifications may change vvithout notice Rms with near Gaussian distribution 3 Optimized for pumping Ti Sapphire amplifiers 3 8 Chapter 4 Warning W Location System Installation The Evolution 30 system must be installed by an authorized Spectra Physics representative Read this section thoroughly beforehand to prepare your site for installation then call your authorized service representative to arrange an installation appointment which is included as part of your pur chase agreement You may however unpack the laser and locate it in the area where it will be used Refer to the unpacking instructions near the beginning of this manual Do not attempt to install the laser yourself or remove the lid sealing the laser cavity Either action 1f unauthorized will void your warranty and you will be charged for the repair of any damage that may result Bef
70. oved This step should be reversed and the cover replaced as soon as the optimization procedure has been completed Cycle the keyswitch on the power supply off and on to clear the cover interlock circuit fault Place the power meter at the Evolution 30 output Set the QSW MODE to INTERNAL and the QSW frequency to 1 0 kHz Start the laser at the Low current setting allow the power to stabilize and make note of the stable power level Remove the set screws covering the mirror adjustment ports on the cor ner of the laser head closest to the umbilical connection Figure 6 1 Put the screws in a safe place Mirror Adjustment Ports Vertical Horizontal Right Side View Figure 6 1 Access to End Mirror Adjustment Screws Using the hex wrenches carefully adjust the vertical screw top left port of the end mirror while monitoring output power Make very small adjustments less than 2 turn total travel Use this process to maximize output power Make a note of the maximum stable power setting Using the same procedure carefully adjust the horizontal screw lower right port while monitoring output power Again make very small adjustments less than Y2 turn total travel Use this process to maximize output power Make a note of the maximum stable power setting Set the Laser State switch to STOP and set the QSW MODE switch to HOLD OFF Set laser current to the Low setting and the power meter to its most sensitive
71. ow thermal lensing and natural birefringence of Nd YLF enable scaling to higher power with out the loss of beam quality or the need for complex resonator designs As a birefringent material Nd YLF lases at two principle wavelengths the 1047 nm extraordinary or the 1053 nm ordinary transition Both lines originate on the same Stark split F upper level The good thermal con ductivity of Nd YLF allows efficient heat extraction and its natural bire fringence overwhelms thermally induced birefringence eliminating the thermal depolarization problems of optically isotropic hosts like Nd YAG 3 1 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser The 1053 nm transition is used in the Evolution 30 because of the some what higher absorption of the pump light by this transition resulting in lower heat generation and therefore lower thermal lensing Acousto Optic Q Switching 3 2 An acousto optic modulator AOM is a block of fused silica that acts as an optical phase grating when vibrated by an ultrasonic wave The photoelas tic effect couples the strain field of the ultrasonic wave to the optical index of refraction in the block The resultant optical grating has a period and an amplitude set by the acoustic ultrasonic wavelength When a light beam is incident upon this grating a portion of the intensity is diffracted out of the beam By choosing beam parameters properly a por tion of any laser beam that attempt
72. oyed or lost we recommend that you order new ones We will return instruments only in Spectra Physics containers Service Centers Troubleshooting and Customer Service Benelux Telephone 31 40 265 99 59 France Telephone 33 1 69 18 63 10 Germany and Export Countries Spectra Physics GmbH Guerickevveg 7 D 64291 Darmstadt Telephone 49 06151 708 0 Fax 49 06151 79102 Japan East Spectra Physics KK Fast Regional Office Daivva Nakameguro Building 4 6 1 Nakameguro Meguro ku Tokyo 153 Telephone 81 3 3794 5511 Fax 81 3 3794 5510 Japan VVest 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 nivamuro 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 1 5 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser 7 6 Appendix A OptiShield Algaecide This sect
73. ronic device consisting of a crystal controlled oscillator double balanced modulator pulse generator with gate and a broad band power amplifier that provides gt 30 W of drive power into each Q switch The driver is controlled and monitored by the SAB LBO Crystal Temperature Controller 3 6 The LBO doubling crystal is temperature tuned for non critical phase matching The crystal is housed in a temperature stabilized oven A resis tive heating element combined with a local temperature sensor is used with the heater controller to stabilize the crystal temperature to within 0 1 F The heater controller is programmed to limit the rate at which the crystal temperature is changed typically no faster than 4 F per minute to prevent cracking the crystal anti reflection coatings The power for the temperature controller is wired directly to the ac power lines so that the crystal is kept heated even when the front panel breaker is turned off The LBO crystal temperature should be ramped down before disconnecting power to the chassis see Chapter 5 System Operation for instructions System Overview The Control Computer Caution W RS 232 Connection Control Software Note The Evolution 30 comes with a commercial laptop computer pre loaded with LabVIEW software that uses an RS 232 serial interface to control and monitor the functions of the laser Although the particular computer delivered with each laser may vary 1t is sp
74. s When not in use lasers should be shut down completely and desig nated off limits to unauthorized personnel Provide enclosures for beam paths whenever possible Terminate the laser beam with an appropriate energy absorbing target Shield unnecessary reflections and scattered laser radiation Avoid blocking the output beam or any reflections with any part of your body Set up the laser so that the beam height is either well above or well below eye level Laser Safety Electrical Safety Precautions A Danger Y Normal operation of the Evolution 30 should not require access to the power supply circuitry Removing the power supply cover will expose the user to potentially lethal electrical hazards Contact an authorized service representative before attempting to correct any problem with the power supply The following precautions should be observed by anyone working with potentially hazardous electrical circuitry e Disconnect main power lines before working on any electrical equip ment when it is not necessary for the equipment to be operating e Do not short or ground the power supply output Protection against possible hazards requires proper connection of the ground terminal on the power cable and an adequate external ground Check these con nections at the time of installation and periodically thereafter e Never work on electrical equipment unless there is another person nearby who is familiar with the operation and
75. s an aid to aligning and troubleshooting the resonator beam waist is located at flat end mirror 11 so that the beam is diverg ing when it reaches one of the output ports A lens located at either output port 1s then used to collimate the beam System Overview Component Descriptions Laser Pump Chamber AOM Q Switches The laser pump chamber contains the Nd YLF laser rod and diode lasers The chamber is mounted to the laser head in a mechanically indexed bracket that allows for easy extraction and insertion of the chamber The laser rod is held with O rings in a water flow tube that is surrounded bya gold coated reflector Slits in the reflector transmit the pump light from the diode lasers along the length of the rod Both the laser rod and diode lasers are cooled by vvater that enters the pump chamber through manifolds in the bottom of the chamber The diode lasers themselves are arranged in three blocks of four high povver diode laser bars that are mounted 120 apart around the laser rod Each block of bars is attached to a single water cooled heat sink The water flows in four separate parallel channels one along the laser rod and three over the diode laser heat sinks The diode lasers are electrically connected in series to the Evolution 30 diode laser driver through a high current con nector on the pump chamber Two AOMs that function as Q switches are enclosed in metal housings with coarse azimuthal adjustments The
76. s to circulate within the resonator experi ences a diffraction loss that is sufficient to spoil the Q of the cavity and prevent lasing i e there is no circulating beam With no circulating laser light available to pass through the laser medium the pump energy builds up the gain to a higher level than would otherwise be present This is where the long lifetime of the upper state laser level of Nd YLF is beneficial The ultrasonic wave is impressed on the AOM by a piezo electric trans ducer Switching off the driving voltage to the transducer returns the AOM to its passive state of high optical transmission and the laser resonator is returned to its high Q state The internal beam is no longer deflected but instead is amplified by the high gain now available in the Nd YLF rod and a powerful Q switched laser pulse is emitted Re applying voltage to the AOM with the transducer again spoils the cavity Q and allows the gain to rebuild to a high level In order to hold off the very high circulating intensity in the Evolution 30 two synchronized AOMs are used This process is repeated at the frequency at which pulsed laser output is desired taking into consideration the characteristics of the laser Cavity lt gt End Mirror Piezo Electric Transducer Figure 3 1 Acousto Optic Modulation System Overview Intracavity Frequency Doubling Efficient frequency doubling requires power densities that are no
77. t 5160 gt Dimensions given in nenos Top View 065 SE 8 50 d 16 5 216 0 2 00 gt Eee 50 8 5 43 na j 1379 90 7 H Te d Right Side View Output End View Figure 4 2 Evolution 30 OEM Laser Head Outline Drawing Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser KA 16 50 419 1 16 70 424 2 Y I T T 1 Y f 1826 Top View i F O Evolution 30 O O LASER ACTIVE as SG OUT RS 232 VO E LASER FAULT 2 1 LBO HEATER CONTROL TIL 1 76 3 o o High Power Diode Pumped Nd YLF Laser System Y Front View Dimensions given in mende mm Figure 4 3 Evolution 30 Power Supply Outline Drawing Note A number of manufacturers produce chillers that are suitable for use with the Evolution 30 Consult the chiller manual included with the system for specifics about your chiller Chapter 5 Eyewear Required Overvievv ER y System Operation Safety glasses for all lasing wavelengths must be worn at all times when Operating this laser system Consult your laser safety officer to select appropriate safety glasses You MUST read Chapter 2 Laser Safety Routine operation of the Evolution 30 is via the Evolution 30 Control software running on the host computer It controls both the laser head and the power supply Familiarize yourself with the operation of the power sup ply module and the control software described below befor
78. t normally available from a CW pumped laser Placing the nonlinear doubling crystal inside the resonator exposes it to high circulating power density Power is coupled out of the resonator at the second harmonic wavelength by using an output mirror that is 100 reflective at the fundamental wavelength but transmits the second harmonic wavelength Intracavity frequency doubling itself behaves in a manner that is somewhat analogous to an output coupler in a normal laser It is only necessary that the conversion efficiency equals the theoretical optimum mirror transmis sion in order to completely convert the fundamental 1053 nm Nd YLF wavelength into the green 527 nm second harmonic In order to achieve frequency doubled output the fundamental and second harmonic light must be phase matched within the crystal that is the 1053 nm and the 527 nm waves must be in phase with each other over a reasonable length of the crystal In order for this to occur the index of refraction of the crystal must be the same at both the fundamental and the frequency doubled wavelengths However since the wavelengths are sub stantially different the two beams will be out of phase since each will see a different value for the index of refraction unless special techniques are employed Non critical phase matching relies on the temperature depen dence of the dispersion of the crystal to provide a match in the refractive index at the two wavelengths As the name i
79. t radiation laser Evitez unsichtbare Specifications l exposition de la Laserstrahlung 5 peau de vos yeux et de votre peau au rayonnement directe ou diffuse Appareil laser de classe IV Puissance max lt 50 VV Longueur d onde 527 nm Largeur de pulse lt Augen oder Hautkontakt mit direckter oder Streustrahlung vermeideni Product der Laser klasse IV Max Ausgangsleistung lt 50 VV 200 us Wellenlaenge 527 nm Pulsdauer lt 200 ys Caution Label Attention Radiation Vorsicht Austritt von RF Energy laser visible et sichtbarer Present invisible rayonnement unsichtbarer und 8 RF capot ouvert Hochfrequenzstrahlu ng wenn geoeffnet Al abrir y retirar el dispositivo de seguridad exist radiacion laser visible y invisible evite que los ojos o la piel queden expuestos tanto a la radiacion directa como ala dispersa Producto laser clase 4 Por esta abertura se emite radiacion laser visible e invisible evite la exposicion Radiaci n laser visible y o invisible Evitar la exposici n directa o dispersada de radiaci n con los ojos o piel Clase IV Producto Laser Maxima Salida lt 50 VV Longitud de ondo 527 nm Logitde de pulso lt 200 us Precaucion Radiacion magnetica visible invisible y de radio frecuencia si abierto Zichtbare en onzichtbare laserstraling Vermijd blootstelling van oog of huid ann direkte straling of terugkaatsingen daarvan Klas 4 laser produkt
80. ty Doubled Diode Pumped Nd YLF Laser Every effort has been made to ensure that the information in this manual is accurate All information in this document is subject to change vvithout notice Spectra Physics makes no representation or vvarranty either express or implied vvith respect to this document In no event vvill Spectra Physics be liable for any direct indirect special incidental or consequential dam ages resulting from any defects in this documentation Should you experience any problems vvith any equipment purchased from Spectra Physics or you are in need of technical information or support please contact Spectra Physics as described in Chapter 7 Troubleshooting and Customer Service Except as permitted under the United States Copyright Act of 1976 no part of this publication may be reproduced or distributed in any form or by any means or stored in a data base or retrieval system without the prior written permission of Spectra Physics Under the law copying includes translation into another language Finally if you encounter any difficulty with the content or style of this manual please let us know The last page is a form to aid in bringing such problems to our attention Thank you for your purchase of Spectra Physics instruments Environmental Specifications Refer to Chapter 4 System Installation for the dimensions of the major Evolution 30 system components and for information regarding correct p
81. uropean 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 Laser Safety 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 Penvvell 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 Pittsfield MA 01202 4949 Tel 413 499 0514 2 15 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser 2 16 Chapter 3 System Overvievv The heart of the Evolution 30 system is an Nd YLF laser rod pumped by three sets of four AlGaAs diode laser arrays twelve arrays total The laser light produced by the Nd YLF laser rod is frequency doubled to green light and emitted as energetic Q switched pulses The Q switched pulse repetition rate is controlled by the user at rates from 1 to 10 kHz The laser pump chamber contains the Nd YLF laser rod and diode lasers The diode lasers pump the Nd YLF rod that is their output excites the electrons
82. ustments or performance of procedures other than those specified herein may result in hazardous radiation exposure The Evolution 30 is a Class IV High Power Laser whose beam is a safety and fire hazard Take precautions to prevent exposure to direct or reflected beams Diffuse as well as specular reflections can cause severe eye or skin damage This safety section should be reviewed thoroughly prior to operating the Evolution 30 laser system Safety precautions listed in this manual should be followed carefully Hazards associated with lasers generally fall into the following categories e Exposure to laser radiation which may result in damage to the eyes or skin e Exposure to chemical hazards such as particulate matter or gaseous substances released as a result of laser material processing or as by products of the lasing process itself e Electrical hazards generated in the laser power supply or associated circuits e Secondary hazards such as X radiation from faulty power supplies Pressurized lamps hoses cylinders etc Pressurized liquids and gasses 2 1 Evolution 30 Intracavity Doubled Diode Pumped Nd YLF Laser Optical Safety Precautions The special nature of laser light poses safety hazards not associated with light from conventional sources The safety precautions listed below are to be read and observed by anyone vvorking with the laser At all times ensure that personnel who operate maintain or service t
83. ystal and Temperature Controller aaa 3 5 Power Supply sisa maneia Sard Waaa Be e bn ae d 3 6 Smart Analog PC Boa 3 6 Diode Laser Power Supply aaa a a aa a tees 3 6 Q Switch Diver zer ee ja ere NANG scat runes A a ala a aia 3 6 LBO Crystal Temperature Controller 3 6 The Control Computer 3 7 RS 232 Connection se i INA A A Bana Oe d a 3 7 Control Software u a ka ta dh ia in EN pene A a aid 3 7 Performance Specifications 3 8 Chapter 4 System Installation 4 1 LOCATION ss SR UAE AS a e dh aa SAM de A 4 1 Pumping a Spitfire Amplifier a a a tee 4 1 Required Utilities mende ts Sate aed Wee SWE GR ee a KANG r 4 1 Preparing to Install the Power Supply 4 2 Preparing to Install the Laser Head 4 3 Preparing to Install the Control Computer 4 3 Preparing to Install the Chiller_ aa 4 4 Mechanical Specifications 4 4 Chapter 5 System Operation 5 1 EE 5 1 Electrical Current Settings 5 1 POWer Supply nern E aa o A S band ad ot 5 2 Power Supply Front Panel 5 2 Power Supply Rear Panel 5 3 Control Softwares z oss nn ah eset e ae ita eg ee ernennen 5 4 Main Control un se down Pewee

Evolution 30 - Spectra

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