Home

Centennia TD.book - Spectra

1. ON OFF Laser Enable Stop Start Power AC Power Switch ON OFF Keyswitch Button Button Adjustment Knob Figure 2 3 Power Supply Front Panel Serial COM Emission Interlock Connector Connector Connector Fuses EMMISION INTERLOCK Umbilical Connector AC Power to the Laser Head Connector Figure 2 4 Power Supply Rear Panel 2 4 Safety Devices Laser Safety Figure 2 3 Figure 2 4 and Figure 2 5 on the following pages show the locations of safety devices on the power supply and laser head On Off AC Power Switch AC Power Indicator Turning on the POWER rocker switch activates electrical power to the cir cuits in the power supply The green POWER LED on the power supply illuminates when electrical power is provided to the power supply circuitry Laser Enable Keyswitch Danger W Ready Indicator Start Button Turning the LASER ENABLE keyswitch to the ON position starts the warm up process that turns on the laser if the AC power switch is turned on first The keyswitch provides interlock safety to prevent unauthorized personnel from using the system when the key is turned to the OFF position and is then removed A high level of laser radiation is temporarily present inside the laser when the start sequence is initiated even if the power level is set to 0 This transient condition is part of the process that warms the laser to its proper operating temperatu
2. Mainte nance and Troubleshooting for more information on diagnosing problems Once the underlying problem has been corrected cycle the AC power off and on Turn the keyswitch on again If the fault is still present contact your Spectra Physics representative The next step will open the shutter and emit the laser beam Before pro ceeding be certain that the beam will be properly terminated by a power detector or other suitable beam block To begin laser emission press and hold in the START button for at least 1 second Pressing the START button initiates the 3 second CDRH emission delay during which time the yellow emission indicators blink on the laser head and on the power supply The shutter opens after the 3 second delay and the EMISSION indica tors on the laser head and power supply now glow steadily From a cold start laser power is initially set to zero Set the desired power level using the dial on the Centennia power supply The laser emits its green laser beam at a power level 2 0 5 W The setting appears in small characters on the power supply LCD screen The actual power output as measured by the internal control loop is displayed in large characters Note that when the shutter is opened output power will be at the set ting displayed on the LCD The power setting selected before the shut ter is opened determines the initial output power Turning the Laser Off Operation Close the shutter by press
3. 3 Energy Level Scheme for the Nd Ion The most probable lasing transition is to the 1 state where a photon at 1064 nm is emitted Because electrons in that state quickly relax to the ground state the population of this state remains low Hence it is easy to build a population inversion in which the number of electrons in the higher energy level exceeds the number in the lower level At room temperature the emission cross section of the transition between these laser levels is high so its lasing threshold the number of photons required to start the stimulated emission of laser light is low Laser Description Diode Pumped Laser Design Diode lasers combine very high brightness high efficiency monochroma ticity and compact size in a near ideal source for pumping solid state lasers Figure 3 4 shows the monochromaticity of the emission of a diode laser compared to a krypton arc lamp and compares that with the absorp tion spectra of the Nd ion The near perfect overlap of the diode laser out put with the Nd absorption band ensures that the pump light is efficiently coupled into the laser medium It also reduces thermal loading since any pump light nor coupled into the medium is ultimately removed as heat 9 o N ag Bi Ke z 1 J N 0 5 0 6 0 7 0 8 0 9 z Wavelength mm 2 c o E b c 2 2 Z lt Krypton Arc i Lamp 0 5 0 6 0 7 0 9 gt Wavelength mm Ed c o
4. E c S lt Diode Laser P Pump Wavelength E LL 0 6 07 0 8 0 9 Wavelength mm oL a Figure 3 4 Nd absorption spectra a compared to the emission of a Krypton Arc Lamp b and a Diode Laser Pump c Spectra Physics uses as a pump laser a high power diode laser with an emission at 808 nm These devices are simple and reliable pump laser sources The emission wavelength of a diode laser is dependant on its internal tem perature and so on the density of the drive current in the device Therefore both the diode laser temperature and drive current must be stabilized to maintain the optimum pump wavelength to produce efficient absorption Another key element in optimizing the efficiency of a solid state laser is maximizing the overlap in the laser crystal the vanadate of the region that is excited by the pump source with that occupied by the fundamental beam The absorption depth in the laser crystal of the pump wavelength is an important consideration here particularly for designs using thin disk tech nology 3 5 Centennia TD Diode Pumped CW Visible Thin Disk Laser System Thin Disk Laser Technology Conventional diode pumped solid state lasers typically have their gain material doped into a crystal with either a cylindrical or a rectangular geometry The major drawback to achieving both high peak output power and good beam quality from these types of lasers is the formation of a tem perature gradien
5. Figure 3 5 Thin Disk Laser Cave 3 6 Figure 3 1 Centennia TD System chiller not shown 3 8 Figure 3 2 Optical Layout of the Centennia TD Laser Head 3 9 Figure 3 3 Outline Drawings for Laser Head and Power Supply 0 0 eee ee eee eee 3 13 Figure 4 1 Centennia TD Laser Head 4 1 Figure 4 2 Centennia Power Supply Front Panel 4 2 Figure 4 3 Centennia Power Supply Rear Panel 4 4 Figure 4 4 Interlock Jumper Plug 4 5 Figure 4 5 Emission Connector Circuit 0 0 n 4 6 Figure 5 1 Base Slots for Mounting Clamps 5 1 Figure 5 2 Location of leg mounting holes on bottom of laser head 0 0000 c eee eee 5 2 Figure 5 3 Centennia TD Interconnect Drawing 5 4 Figure 5 4 Power Supply Rear Panel 5 4 List of Tables Table 2 1 Label Translati0NS oooocoooocoo m EE 2 12 Table 3 1 Centennia TD Laser Output Characteristics llle 3 11 Table 3 2 Utilities NEE a a a a ne 3 11 Table 3 3 Fuse Ratings for Fl and 3 11 Table 3 4 Dimensions and Weight 3 12 Table 3 5 Chiller Requirements 3 12 Centennia TD Diode Pumped CW Visible Thin Disk Laser System Warning Conventions The following warnings are used throughout this manual to draw your attention to situations or procedures of particular importance They warn of hazards to health and safety damage to equipment sensitive procedures and exceptional circumstances All messages are set apart by a thin line above and below t
6. The Centennia TD System The Centennia TD system comprises the Centennia TD laser head and the Centennia power supply An umbilical cable permanently attached to the laser head provides control and electrical power from the power supply The Centennia TD laser head is water cooled An optional recirculating chiller is available for supplying the specified water flow The following sections describe the laser head and power supply The chiller is described in its user s manual ITT INN Ge ais OF OF OF email d Ee Fei ARN SA Figure 3 1 Centennia TD System chiller not shown ao The laser head is designed for maximum reliability with minimum com plexity The Centennia TD vanadate thin disk crystal is energized by a diode pump laser inside the laser head The vanadate infrared output is then intracavity frequency doubled in a lithium triborate LBO crystal to produce the green laser beam The operation is inherently so stable and the output so quiet that no adjustments are needed in normal operation The Centennia TD Laser Head 3 8 Figure 3 2 illustrates the optical design of the Centennia TD laser head A lens not shown in the diagram focuses the high power diode laser pump light into the thin crystalline disk of vanadate which generates the 1064 nm infrared intracavity light The back of the disk has a coating that is highly reflective at the 1064 nm wavelength The disk is bonded
7. ehh hh hh 6 1 Turning the Laser On 6 3 viii Table of Contents Chapter 7 Maintenance and Troubleshooting nsssnnssnnnnsnnnnsnnn 7 1 EI le 7 1 Troubleshooting 4 4 A a a eda etes a ee ara 7 2 Service Training Programs 7 2 Troubleshooting Guide o ooocccoocc hr eee 7 2 Chapter 8 Customer Service 8 1 Customer AVI sc ar ae en ne a be ae ee ene a en ee 8 1 Waranty sind en Sach EEN 8 1 Returning the Instrument for Repair 8 2 Removing Water from the System 222 2uee seen een ernennen 8 2 Service COnterS ica a ad ee cused ee eee ide AE EE ee 8 3 Notes Report Form for Problems and Solutions List of Figures Figure 1 1 The Centennia TD System 1 1 Figure 2 1 CE and CDRH standard safety warning labels 2 2 Figure 2 2 Folded Metal Beam Tore 2 2 Figure 2 3 Power Supply Front Panel 2 4 Figure 2 4 Power Supply Rear Panel 2 4 Figure 2 5 Centennia TD Laser Head Emission Indicators 0000 eee ee eee 2 6 Figure 2 6 Emission Connector Schematic 222m seen nennen nenn 2 6 Figure 2 7 Interlock Jumper Plug 2 7 Figure 2 8 CDRH Radiation Control Drawing 2 10 Figure 2 9 CE CDRH Warning Labels 0 0 c cet eee 2 11 Figure 3 1 Electrons occupy distinct orbitals llle 3 2 Figure 3 2 A Typical Four level Transition Scheme 3 3 Figure 3 3 Energy Level Scheme for the Nd3 on 3 4 Figure 3 4 Nd3 absorption spectra 0 eee 3 5
8. environmental condi tions e g fire flood mechanical shock spilled solvent etc check to see that all features of the product identified on the CDRH Radiation Control Drawing found later in this chapter function properly Also make sure that all warning labels remain firmly attached 1 Verify that removing the INTERLOCK jumper plug or opening a user installed safety switch connected to the Centennia power supply Fig ure 2 7 prevents laser operation 2 Verify that the laser can only be turned on when the key switch is in the ON position and that the key can only be removed when the switch is in the OFF position 3 Verify that the emission indicator s provide a visible signal when the laser emits accessible laser radiation that exceeds the accessible emis sion limits for Class I 4 Verify the time delay between turn on of the emission indicator s and the start of the laser it must give enough warning to allow action to avoid exposure to laser radiation 5 Verify that when the interlock loop is opened the shutter closes and actually blocks laser radiation emission If any of the above items fail to operate as noted and you cannot correct the error please call your Spectra Physics service representative for assistance 0 39 uW for CW operation where output is limited to the 400 to 1400 nm range 2 9 Centennia TD Diode Pumped CW Visible Thin Disk Laser System CDRH Radiation Control Drawing Numbers refer
9. is available as an option The beam is expanded to its final output diameter and divergence by a telescopic lens combination The shutter blocks the beam until commanded to open by pressing and holding in the START button on the power supply A beam splitter and photodiode sample the output and provide feedback to the pump laser driver to provide a constant output The light pick off is an integral part of the system The minimum power output from the laser is 0 50 W the maximum power level is greater than 5 W Cooling Waste heat in the laser head is generated by thermo electric coolers that maintain the LBO crystal and the diode pump laser at their proper operating temperature Waste heat is also produced by the laser light that is not completely absorbed in the pumping and frequency doubling processes The combined heat from these sources totals less than 300 W and it is removed from the laser head by the flow of cooling water provided by a recirculating chiller Hoses metric dimensions no polarity are permanently attached to the laser head for the recirculating water flow 3 9 Centennia TD Diode Pumped CW Visible Thin Disk Laser System The Centennia Power Supply System Control 3 10 Note E The air cooled Centennia power supply provides current for the diode pump laser in the laser head and it is the control unit for the system as well The power supply is auto ranging For electrical power it requires a standard 50 o
10. is straightforward using the controls and LCD screen on the front panel of the Centennia power supply Emission indicators on the laser head and power supply blink to warn that laser emission is imminent and then glow steadily when the laser beam is present The LCD screen displays both the requested power output and the measured output of the laser as determined by the power control loop LEDs also indicate the readiness of the system for operation or the activation of a system interlock Electrical power and control is transmitted through the umbilical that con nects the laser head to the power supply The Centennia TD laser head is water cooled and an optional recirculating chiller is available that meets the cooling requirements of the system This chiller displays the temperature of the cooling fluid water on the front panel for easy monitoring Because the Centennia TD system is designed for recirculating cooling it requires no facility water connections The Centennia TD system is manufactured under the following patents DE 59 407 111 DE 19 746 835 EP 0 911 920 EP 0 632 551 WO 2001 1 022541 US 6 711 184 EP 0 869 591 DE 19 946 176 EP 0 869 592 JP 2003 510821 US 5 553 088 CA 2 351 409 1 3 Centennia TD Diode Pumped CW Visible Thin Disk Laser System 1 4 Chapter 2 Warning IN Danger Laser Radiation Eyewear Required Hazards a Laser Safety This user information is in compliance with section 1040 1
11. meet these requirements over the entire environmental operating temperature range of the system 18 C to 316 The chiller should use distilled water e The chiller output flow must use a partial flow liquid filter of 100 um or smaller filter size Table 3 5 Chiller Requirements water flow rate recommended 3 0 to 3 5 liters minute 0 8 to 0 9 gallons minute minimum 2 0 liters minute 0 5 gallons minute water temperature 20 0 5 C 68 0 9 F maximum pressure at 5 bar 73 psi the laser head inlet Laser Description Outline Drawings All measurements shown in _ nches _ millimeters 18 00 0 66 4 00 lt 457 2 138 gt 167 101 6 30 2 di Y B A 2 68 ee 1 00 0 50 3 x 1 4 or 6 mm top mount iis 2 32 3 x 8 32 thru 58 9 4 02 232 1020 58 9 La Ze D f e Centennia TD 5 31 19 49 2 34 372 5 gt S Se 135 0 495 0 1 28 32 6 16 43 lt 417 4 A FO 13 74 lt 0 ur i 133 5 A 13 46 342 0 c h Y L h 0 60 15 0 F o rA Y 14 78 lt 375 5 zZ Figure 3 3 Outline Drawings for Laser Head and Power Supply 3 13 Centennia TD Diode Pumped CW Visible Thin Disk Laser System 3 14 Chapter 4 Controls Indicators and Connections This section defines the user controls indicators and connections of the Centennia TD l
12. style con nectors Pin Description 3 Common C 2 Normally Open NO 1 Normally Closed NC 4 5 Centennia TD Diode Pumped CW Visible Thin Disk Laser System da 24V C NO NC 3C 8 2 1 2 NO Tuc Are 5 10 EMISSION 3 fpl E Ky Nio T EMISSION V Figure 4 5 Emission Connector Circuit Safety INTERLOCK Connector 4 6 This is a system interlock that must be closed for operation The plug pro vided with the system can be replaced with a connector that is wired to auxiliary safety equipment such as a door switch to stop laser emission when actuated the switch is opened When the interlock is open the shutter in the laser head closes immedi ately blocking laser emission Note that the diode pump laser remains on and that laser radiation is still present in the laser head The shutter can be opened and laser operation restored to normal once the interlock fault has been cleared The laser power level will be at the set value displayed in small characters on the power supply LCD The switch connected to this interlock must be designed for a 12 V 100 mA signal The mating connector is AMP part number 350777 1 which uses female crimp pins AMP part number 350536 1 The AMP pins are designed for specific wire gauges so choose the appropriate wire Other connectors will fit these jacks including solder cup and IDC style con nectors Pin Description 1 System Interloc
13. technology the Nd YVO laser material and the nonlinear optical frequency doubling employed by the Centennia TD to produce its green output beam The theoretical discussion is followed by a more detailed description of the Centennia TD system itself The chapter concludes with specifications and outline drawings Chapter 4 Controls Indicators and Connections and Chapter 5 Instal lation describe the Centennia TD connections and controls then guide you through the installation of the system Chapter 6 Operation describes how to operate the laser using the controls and LCD display on the front panel of the Centennia power supply Chapter 7 Maintenance and Troubleshooting will help you to 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 Chapter 8 Customer Service gives information on service calls and war ranty issues Should you experience any problems with any equipment pur chased from Spectra Physics this chapter contains a list of world wide Spectra Physics service centers you can call if you need help This product has been tested and found to conform to Directive 73 23 EEC governing product safety using standards EN 61010 1 2001 and EN 60825 1 2002 and it conforms to Directive 89 336 EEC governing electromagnetic compatibility u
14. the table by inserting the three laser head clamps provided into the slots in the mounting base as shown in Figure 5 1 Then using table mounting screws along with the nested spherical washers also provided fasten the laser to the table using the desired mounting holes If ordered as the pump source for a Tsunami laser the height of the output beam from the Centennia TD must be raised so that it can be input to the Tsunami The Tsunami comes with a set of legs that will adjust the Centen nia TD output to the correct height Instructions for mounting the Centen nia TD using these legs are given below l If the Centennia TD will be used to pump a Spectra Physics Tsunami laser screw the 3 legs included in the Tsunami accessory kit into the holes shown in Figure 5 2 until they are secure The 3 5 in legs raise the laser off the table to a beam height of approximately 5 8 in 14 8 cm 3 x 8 32 ue through Pd oO T d P d o o Ill ar oO ES IM in Optional OEM Mounting Figure 5 2 Location of leg mounting holes on bottom of laser head the second set of holes is for OEM use only 2 Clamp the legs in place with the 3 foot clamps provided with the legs Slide the U shaped clamp end over the foot of each leg place a table mounting screw through the slot and fasten the leg to the table Installing the Power Supply Caution Il 5 2 Provide at
15. this manual a packing slip listing all the parts shipped the Centennia TD Test Summary the Ship Report and an accessory kit The following accessories are shipped standard with the sys tem e 1 US and 1 European power cord about 2 m e Table clamp kit 3 clamps 3 pairs of nested spherical washers 3 mounting screws e 13 mm wrench e 2keys for the power supply e 210A fuses e An INTERLOCK jumper plug Chapter 1 The Centennia TD Introduction Figure 1 1 The Centennia TD System The Spectra Physics Centennia TD is an innovative cost effective system that produces a continuous green laser beam generating more than 5 Watts of laser power at a wavelength of 532 nm Machined from a solid alumi num block the Centennia TD sealed laser head features a rugged industrial design and simple hands off operation The Centennia TD employs thin disk technology a novel approach to the problems of thermal management of solid state laser materials The funda mental laser action in the Centennia TD is produced by exciting or pump ing a thin disk of vanadate crystalline material with the output of a high power diode laser The infrared output of the diode pumped vanadate disk is then converted to the green Centennia TD output beam through the non linear optical phenomenon of frequency doubling The use of thin disk technology results in a laser architecture that is sim pler more efficient and lower cost than conve
16. to a heat sink for superior thermal stability Laser Description Thin Disc Laser Crystal Output II Beam Diode Pump lt A Laser Shutter Collimating Dichroic LBO High Lens Reflector Reflector Figure 3 2 Optical Layout of the Centennia TD Laser Head Frequency Doubling The fundamental 1064 nm beam is directed into the frequency doubling limb of the resonator by a dichroic reflector The 1064 nm beam passes through the LBO crystal where the 532 nm harmonic beam is generated The LBO is oriented at the critical phase matching angle required for fre quency doubling and temperature tuned for the maximum production of green light Heating the LBO also counters the absorption of humidity which can cloud and damage the crystal A compact temperature regulated mount is used to maintain the crystal at the appropriate temperature about 40 C to optimize the conversion to 532 nm power Both the fundamental beam and the green beam are reflected back by a high reflector for a second pass through the LBO crystal The frequency doubled green beam then passes through the dichroic output coupler and is directed out of the laser while virtually all of the fundamental beam is reflected by the dichroic output coupler and trapped within the laser head Beam Delivery A lens collects and collimates the output beam and a 90 polarization rota tor aligns the polarization axis to vertical orientation horizontal polariza tion
17. 0 of the CDRH Laser Products Performance Standards from the Health and Safety Act of 1968 The use of controls or adjustments or the performance of procedures other than those specified herein may result in hazardous radiation exposure The Spectra Physics Centennia TD laser is a Class IV High Power Laser whose beam is by definition a safety and fire hazard Take precautions to prevent accidental exposure to both direct and reflected beams Diffuse as well as specular beam reflections can cause severe eye or skin damage This safety section should be reviewed thoroughly prior to operating the Centennia TD laser system and the safety precautions listed herein should be followed carefully Hazards associated with the use of diode pumped lasers generally fall into the categories listed below At all times while working with these lasers please be aware of these potential hazards and act accordingly You are responsible for your health and the health of those working around you e Exposure to laser radiation can result in damage to the eyes or skin e Exposure to chemical hazards such as particulate matter or gaseous substances can be health hazards when they are released as a result of laser material processing or as by products of the lasing process itself When these lasers are used to pump dye laser systems be aware that the dyes used can be extremely hazardous to your health if inhaled or in some cases touched e Expos
18. Centennia ID Diode Pumped CW Visible Thin Disk Laser System User s Manual This laser product complies with perfor mance standards of United States Code of Federal Regulations Title 21 Chapter 1 Food and Drug Administration Department of Health and Human Services Subchapter J Parts 1040 10 a 1 or 2 as applicable S Spectra Physics A Division of Newport Corporation 1335 Terra Bella Avenue Mountain View CA 94043 Part Number 0000 346A Rev A November 2005 Preface This manual contains information you need in order to safely install oper ate maintain and troubleshoot your Centennia TD diode pumped continu ous wave visible laser The system is composed of the Centennia TD laser head and the Centennia power supply The laser head is water cooled and an optional chiller is available to supply the specified water flow Chapter 1 Introduction is an overview of the Centennia TD system Chapter 2 Laser Safety is an important chapter on laser safety The Centennia TD s a Class IV laser and as such emits laser radiation which can cause severe damage to eyes and skin This section contains informa tion about these hazards and offers suggestions on how to safeguard against them To minimize the risk of injury be sure to read this chapter then carefully follow its instructions Chapter 3 Laser Description contains a short section on laser theory particularly regarding the thin disk laser
19. D laser head together with the Centennia power supply comply with all CDRH safety standards when operated using the controls and adjustments on the front panel of the Centennia power supply However if the laser is remotely controlled through a serial interface you must provide the following in order to satisfy CDRH regulations e An emission indicator that indicates laser energy is present or can be accessed It can be a power on lamp a computer display that flashes a statement to this effect or an indicator on the control equipment for this purpose It need not be marked as an emission indicator so long as its function is obvious Its presence is required on any control panel that affects laser output e A safety key must be provided to prevent unauthorized use The LASER ENABLE keyswitch must be turned to the On position to enable laser operation If the key is not accessible software control can be used together with the password feature of your computer In this case the LASER ENABLE keyswitch must also be left in the ON position Maintenance Necessary to Keep this Laser Product in Compliance with Center for Devices and Radiological Health CDRH Regulations This laser product complies with Title 21 of the United States Code of Fed eral Regulations Chapter 1 subchapter J parts 1040 10 and 1040 11 as applicable To maintain compliance with these regulations once a year or whenever the product has been subjected to adverse
20. Power Indicator oein reg Rn See eee ELI SENS DR ee e 2 5 Laser Enable Keyswitch 0 0 0 eee nh 2 5 Ready Indicate ini vanes a it eeu ER 2 5 Start B tlon ar ai Em 2 5 Laser Emission Indicators 2 6 Power Adjustment Dal 2 7 Errotdtdieator eddie ehe eh eege MA ots 2 7 Stop B tlon uere a REA RI EEE TEREE e EE E ERE 2 7 MULLS rs sete iR SoM EXE PV EE Euge ans ee EA e 2 7 External Interlocks 11 2 0 o Eton a ee Be en e Tee Eee a e ena a 2 7 Waste Electrical and Electronic Equipment Recycling Label 2 8 CDRH Requirements for Operating the CentenniaTD 2222er seen ee 2 9 Maintenance Necessary to Keep this Laser Product in Compliance with CDRH Regulations 2 9 vii Centennia TD Diode Pumped CW Visible Thin Disk Laser System CDRH Radiation Control Drawing 2 10 CE CDRH Warning Labels rsr raaire r kep een 2 11 Label Translations carioca aa A daa 2 12 CE Declaration of Conformity 2 13 Sources for Additional Information 2 14 Laser Safety Standards 2 14 Equipment and Training viii A hn eas A Ri Nee 2 15 Chapter 3 Laser Description 3 1 A Brief Review of Laser Theory 000 eee nennen 3 1 Emission and Absorption of Light 3 1 Population Inversion lilii rr 3 2 Resonant Optical Cave 3 3 Nd3 as a Laser Medium 22mm et een 3 4 Diode Pumped Laser Design 3 5 Thin Disk Laser Technology 3 6 Frequency Doubling cios ea ar Rn 3 7 The Centennia TD S
21. a safety switch or be shorted together using the jumper plug in order for the laser to operate D Figure 2 7 Interlock Jumper Plug 2 7 Centennia TD Diode Pumped CW Visible Thin Disk Laser System To use this interlock remove the jumper plug from the INTERLOCK connector and use a similar connector to wire to a perimeter safety switch The jumper plug provided may be used for this purpose if the jumper wire is removed The switch can be attached to an access door or to other auxiliary safety equipment Wire the switch as normally closed so that when the door or safety device is opened the shutter in the laser head is immediately closed thus protecting personnel from injury Note that although the shutter is closed the diode pump laser remains on and that laser radiation is still present in the laser head The shutter can be opened and laser operation restored to normal once the interlock fault has been cleared The laser power level will resume at the set value Cover Safety Interlocks The laser head and power supply covers are not interlocked as neither unit is allowed to be opened by the user The warranty on the entire system will be void if the outer cover or the sealed inner cover of the laser head is removed or if the power supply cover is removed For the benefit of trained service personnel who have been authorized to work on the system labels under the power supply cover also warn of high voltages and state th
22. ansition frequency of the laser material 3 3 Centennia TD Diode Pumped CW Visible Thin Disk Laser System Nr as a Laser Medium 3 4 The source of excitation energy for a crystalline laser gain medium is usu ally optical typically another laser The Centennia TD uses the near infra red output from a diode laser to pump Nd ions that have been doped into a yttrium vanadate crystalline matrix Nd YVO referred to simply as vanadate The properties of neodymium doped matrices are the most widely studied and best understood of all solid state laser media The four level Nd ion scheme is shown in Figure 3 3 The active medium is triply ionized neody mium which has principle absorption bands in the red and near infrared The electrons in the neodymium ions are very efficient at absorbing the diode laser light which excites them to the pump bands shown in the fig ure The excited electrons quickly drop to the F level the upper level of the lasing transition where they remain for a relatively long time 20 r Pump Bands 18 r 16 F 4F 3 0 11502 cm 1 Ro L gt n AA 11414 Ry 12 Lie y Laser Fso 7 Transition T 10 L Laser Fa f Transition NT 6000cm ET Pug gt doinna F iFa 6 An SSS 2526 eU apu 2478 4 hao 3 2 Y 2146 RE 111 E 2029 2 r us Y 2001 4F ca 4l 3 2 ME dq te round Level gt 134 pos Figure 3
23. are reconnected and tightly fastened to the chiller before restarting the laser after moving it Take care to properly refill the chiller and laser head with coolant There is no alignment procedure for the Centennia TD laser system there are no knobs to adjust or optics to align Refer to Chapter 6 Operation when you are ready to turn on the laser 5 5 Centennia TD Diode Pumped CW Visible Thin Disk Laser System 5 6 Chapter 6 Operation 2 Danger The Spectra Physics Centennia TD laser is a Class IV High Power Laser Radiation Laser whose beam is by definition a safety and fire hazard Take precautions to prevent accidental exposure to both direct and reflected Eyewear OBA beams Diffuse as well as specular beam reflections can cause severe Required eye or skin damage Please read this entire chapter and Chapter 2 Laser Safety before using your laser for the first time System Startup and Shutdown The Centennia TD is operated in a straightforward manner using the con trols and the LCD display on the power supply Turning the Laser On 1 Verify that all connections are properly attached to the power supply and laser head they should already be connected if they are not refer to Chapter 5 Installation for instructions on reconnecting them 2 Turn on the chiller if it is not on already Verify that it is set to 20 C Refer to the chiller user s manual for instructions 3 Set the AC r
24. aser head and the power supply Information on the chiller can be found in the user s manual for that product Operating the laser sys tem is described in Chapter 6 The Centennia TD Laser Head Emission Indicators Hose Connectors Umbilical Figure 4 1 Centennia TD Laser Head Controls There are no adjustments on or inside the Centennia TD laser head Indicators Laser Emission indicators yellow warn of present or imminent laser radiation These CDRH indicators are located on top of the laser near the output end They blink during the 3 second delay between when the START button is pressed and the actual emission at which time the indicators glow steadily The two indicators are redundant for safety 4 1 Centennia TD Diode Pumped CW Visible Thin Disk Laser System Legs Connections Legs 3 optional shipped with the Tsunami laser when ordered provide a means to set the level of the output laser beam to a height appropriate for pumping a Spectra Physics Tsunami Ti sapphire oscillator The legs are sturdy precision machined posts that screw into the 8 32 holes on the 3 mounting pads located on the bottom of the laser head Table clamps are provided There are no height adjustments Umbilical connector provides control signals and power to the laser head Disconnect the umbilical only at the power supply This umbilical is permanently attached to the laser head do not try to remove it Water hose
25. at power must be off before the internal power supply covers can be removed Waste Electrical and Electronic Equipment Recycling Label To Our Customers in the European Union As the volume of electronics goods placed into commerce continues to grow the European Union is taking measures to regulate the disposal of waste from electrical and electronic equipment Toward that end the Euro pean Parliament has issued a directive instructing European Union member states to adopt legislation concerning the reduction recovery re use and recycling of waste electrical and electronic equipment WEEE In accordance with this directive the accompanying product has been marked with the WEEE symbol See label 3 on page 2 11 The main purpose of the symbol is to designate that at the end of its useful life the accompanying product should not be disposed of as normal munic ipal waste but should instead be transported to a collection facility that will ensure the proper recovery and recycling of the product s components The symbol also signifies that this product was placed on the market after 13 August 2005 At this time regulations for the disposal of waste electrical and electronic equipment vary within the member states of the European Union Please contact a Newport Spectra Physics representative for infor mation concerning the proper disposal of this product Laser Safety CDRH Requirements for Operating the Centennia TD The Centennia T
26. before the shutter opens Each of the indicators in a pair function identically They are duplicated for safety if one indicator fails the remaining indicator will still be available to warn of present or impending laser radiation Emission Indicators Figure 2 5 Centennia TD Laser Head Emission Indicators In addition to the indicators provided on the laser head and power supply the EMISSION relay connector provided on the back of the power supply see Figure 2 4 and Figure 2 6 can be used to turn on and off an optional user installed emission indicator When the shutter is closed i e there is no emission there is closure between Pins 3 and 1 and an open condition between Pins 3 and 2 The opposite is true when the shutter is open There is no power supplied by these terminals This circuit is rated for 30 Vac at 1 A See Chapter 5 for information about parts that mate to this connector This relay turns on 3 seconds before actual emission occurs d 24 V C NO NC 8 2 1 JOW EMISSION Ky Nio EMISSION v Figure 2 6 Emission Connector Schematic Laser Safety Power Adjustment Dial Error Indicator Stop Button Shutter External Interlocks Note g The dial is a rotating adjustment that sets the laser power level in units of Watts in hundredths of a Watt resolution The power level setting is shown on the LCD Display The laser operates in a power range from 0 5 W to 5 00 W the minimum adjustmen
27. closures for beam paths whenever possible Set up shields to prevent any unnecessary specular reflections Set up a beam dump to capture the laser beam and prevent accidental exposure Figure 2 2 VISIBLE AND OR INVISIBLE LASER RADIATION AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION CLASS 4 LASER PRODUCT VISIBLE AND OR INVISIBLE LASER RADIATION AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION CLASS 4 LASER PRODUCT iaAIAs C 532 NM MAXIMUM OUTPUT 40 W MAXIMUM OUTPUT 15 W SEE MANUAL SEE MANUAL Figure 2 1 These CE and CDRH standard safety warning labels would be appropriate for use as entry warning signs EN 60825 1 ANSI Z136 1 Section 4 7 Figure 2 2 Folded Metal Beam Target Laser Safety Danger Use of controls or adjustments or the performance of procedures other than those specified herein may result in hazardous radiation exposure Danger Operating this laser without due regard for these precautions or in a W manner that does not comply with recommended procedures may be dangerous At all times during installation maintenance or service of your laser avoid unnecessary exposure to laser or collateral radiation that exceeds the accessible emission limits listed in Performance Standards for Laser Products United States Code of Federal Regulations 21 CFR1040 10 d Any electronic product radiation except laser radiation emitted by a laser p
28. ctra Physics regional distribution center to obtain the correct one see Chapter 8 Customer Service for telephone numbers 4 Verify that the correct fuses are in place for the power supply Refer to Specifications on page 3 11 5 Connect both metric water hoses from the laser head to the chiller The hose connections are not polarized 6 Verify the water level in the chiller and then turn it on Verify that water is flowing and that there are no leaks at the hose connections 7 Set the chiller temperature to 20 C 68 F This completes the installation of the Centennia TD system For information on how to use the serial interface on the power supply to control the Centennia TD system contact Spectra Physics Moving the System Alignment To move the system disconnect the chiller supply lines at the chiller and drain the lines Follow the directions included in the chiller manual for han dling the coolant Note that if the coolant water contains an algaecide it is likely to be classified as a hazardous material If only a small cart is available to move the system the laser head can be placed on top of the power supply on the cart Balance the laser head care fully as it is considerably longer and heavier than the power supply Be careful that the umbilical or water hoses do not snag while moving the laser head Move the chiller separately from the laser head and power supply Make sure the cooling lines
29. ctron at a given position The shape of the orbital is determined by the radial and angular dependence of this probability An atom excited to E can also be stimulated to decay to E by interacting with a photon of frequency v emitting energy in the form of a pair of pho tons that are identical to the incident one in phase frequency and direction This is known as stimulated emission By contrast spontaneous emission produces photons that have no directional or phase relationship with one another A laser is designed to take advantage of absorption and both spontaneous and stimulated emission phenomena using them to create conditions favor able to light amplification The net absorption at a given frequency is the difference between the rates of emission and absorption at that frequency It can be shown that the rate of excitation from E to E is proportional to the number of atoms in the lower level N Similarly the rate of stimulated emission is proportional to the population of the upper level N Moreover the probability of a transi tion depends on the flux of the incident wave and a characteristic of the transition called its cross section The absorption coefficient depends only on the difference between the populations involved N and N and the flux of the incident wave When a material is at thermal equilibrium there is a distribution of its atoms over the array of available energy levels with most atoms in the gr
30. ctron is determined by the orbital that it occupies and the over all energy of an atom its energy level depends on the distribution of its electrons The level with the lowest possible energy 1s called the ground state and higher energy levels are called excited states If an atom is in its ground state it will stay there until it is excited by external forces Movement from one energy level to another a transition happens when the atom either absorbs or emits energy Upward transitions can be caused by collision with a free electron or an excited atom and transitions in both directions can occur as a result of interaction with a photon of light Con sider a transition from a lower level whose energy content is E to a higher one with energy E It will only occur if the energy of the incident photon matches the energy difference between levels i e hv E E 1 where h is Planck s constant and vis the frequency of the photon Likewise when an atom excited to E decays to E it loses energy equal to E E The atom may decay spontaneously emitting a photon with energy hv and frequency E E E 2 h Light will be used to describe the portion of the electromagnetic spectrum from far infra red to ultraviolet 3 1 Centennia TD Diode Pumped CW Visible Thin Disk Laser System Population Inversion 3 2 Figure 3 1 Electrons occupy distinct orbitals that are defined as the probability of finding an ele
31. d here Indoor use Altitude up to 3000 m Temperatures 18 C to 35 C Relative humidity 8 to 85 non condensing over specified temperature range Mains supply voltage do not exceed 10 of the nominal voltage Insulation category II Pollution degree 2 This equipment has been tested and found to comply with 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 right to operate the equipment CDRH and UL Regulations This product conforms to the requirements of 21 CFR 1040 10 CDRH In addition it has been designed and tested to comply with Underwriters Lab oratory UL60950 Ed 3 and it conforms to the requirements of UL recog nized components Table of Contents Preface MT T Ed iii Environmental Specifications clle V CE Electrical Equipment Requirements o ooococccccoo n V Envi
32. e 4 EN 60825 1 2002 532nm Potencia max ima 6W 1064 Potencia maxima 10mW Este producto esta fab ricado con una o m s de las siguientes pat entes Vanuit dit apertuur wordt zichtbare en onzichtbare laserstraling geemiteerd Vermijd blootstelling Zichtbare en of onzicht bare laser straling Ver mijd blootstelling aan ogen of huid door directe of gereflecteerde straling Klasse 4 laser produkt EN 60825 1 2002 532nm maximaal uittre dend vermogen 6 W 1064nm maximaal uittre dend vermogen 10mW Dit product is gefabri ceerd met een of meer van de volgende pat enten 2 12 Laser Safety CE Declaration of Conformity We Spectra Physics 1335 Terra Bella Avenue Mountain View CA 94043 United States of America declare under our sole responsibility that the following products Centennia TD Laser System manufactured after July 1 2005 meet the intent of the EMC Directive 89 336 EEC 2004 C 98 05 for elec tromagnetic compatibility and 73 23 EEC 1973 for low voltage direc tives Compliance was demonstrated to the following Specifications as listed in the official Journal of the European Communities EMC Directive 89 336 EEC 2004 C 98 05 EN 61326 1 1997 A1 A2 A3 Electrical equipment for measurement control and laboratory use EMC requirements EN 61000 3 2 EMC Part 3 Limits Section 2 Limits for harmonic current emissions EN 61000 3 3 EMC Part 3 Limits Section 3 Lim
33. e population of E is kept large and that of E remains low thus establishing a population inversion between E and E Under these conditions the absorption coefficient at v becomes negative Light is amplified as it passes through the material which is now called an active medium The greater the population inversion the greater the gain E4 A Xx E3 no n4 E2 E4 Figure 3 2 A Typical Four level Transition Scheme Resonant Optical Cavity To sustain lasing action most laser gain materials must be placed in a reso nant optical cavity This most often consists of two mirrors that reflect laser emission back through the gain material i e a photon emitted parallel to the cavity axis is trapped in the cavity Then stimulated emission produces two photons of equal energy phase and direction for each reflected pho ton The two photons become four four become eight and the numbers continue to increase geometrically until an equilibrium between excitation and emission is reached Both cavity mirrors are coated to capture the wavelength or wavelengths of interest while allowing all others to pass out of the cavity One of the mirrors the output coupler also transmits a fraction of the energy stored within the cavity and this radiation forms the output beam of the laser The laser light within the resonant cavity oscillates within a narrow range of frequencies and corresponding wavelengths supported by the tr
34. ed in conjunction with the Centennia TD laser 7 1 Centennia TD Diode Pumped CW Visible Thin Disk Laser System Troubleshooting Service Training Programs The Centennia TD diode pumped solid state laser is designed for hands off operation This product does not require alignment or routine cleaning of cavity optics Repair is generally limited to replacing the entire laser head or the power supply Unauthorized repair will void the warranty Spectra Physics offers service training programs to train personnel in the diagnosis of problems and service of the system These programs are tai lored to suit the needs of the customer and can be conducted on site or at our factory For more information or to schedule a training program con tact your sales representative Troubleshooting Guide If an interlock is activated or a system failure occurs current to the diode pump laser in the laser head is turned off The yellow ERROR LED on the front panel of the power supply will illuminate and the LCD screen will display an error code that may be helpful in diagnosing the problem To clear the error status turn off the keyswitch correct the underlying prob lem and then cycle the AC power off and back on Likely causes of an error indication are the activation of one of the safety interlocks such as an optional door switch or the temperature of the cool ing water exceeding the preset protective limit This troubleshooting guide is fo
35. ed representative of Spectra Physics Spectra Physics will provide at its expense all parts and labor and one way return shipping of the defective part or instrument if required In warranty repaired or replaced equipment is warranted only for the remaining portion of the original warranty period applicable to the repaired or replaced equipment Centennia TD Diode Pumped CW Visible Thin Disk Laser System 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 also does not apply to equipment or components that upon inspection by Spectra Physics is found to be defective or unworkable due to abuse mishandling misuse alteration negligence improper installa tion unauthorized modification damage in transit or other causes beyond the control of Spectra Physics This warranty is in lieu of all other warranties expressed or implied and does not cover incidental or consequential loss This warranty is valid for units purchased and used in the United States only Products shipped out side the United States are subject to a warranty surcharge Retu
36. efer to the interconnect drawing Figure 5 3 and the connector locations shown in Figure 5 4 1 Plug the umbilical connector into the socket of the power supply and tighten it 100 240 VAC 50 60 Hz Power Cord Serial COM RS 232 Control Computer Optional Umbilical Power Supply External External Emission Indicator Interlock Figure 5 3 Centennia TD Interconnect Drawing Serial COM Emission Interlock Connector Connector Connector Fuses EMMISION INTERLOCK 0000000 00000000 0000000 Umbilical Connector AC Power to the Laser Head Connector Figure 5 4 Power Supply Rear Panel Note B Installation 2 If an emission indicator lamp is required in addition to those on the laser head and the power supply front panel use the EMISSION relay connector on the rear panel of the power supply to turn a lamp on and off Refer to EMISSION Connector on page 4 5 for information on how to wire and use this optional relay driven indicator 3 Attach the provided IEC power cord to the connector on the power supply and fasten it to the receptacle using retaining screws so that it cannot pull out Plug the other end of the cord into a facility power out let that can supply 100 to 240 Vac 15 A single phase power A Schuko type plug is provided for European operation If you received a plug inappropriate for your area call your Spe
37. escope assembly Symptom The Centennia TD shuts itself off in power mode Possible Causes Corrective Action Incorrect pick off calibration Call your Spectra Physics service representative power readout Symptom The Centennia TD will not lase Possible Causes Corrective Action The shutter is not open Command the shutter to open An interlock is either open or Verify that all interlocks are closed before starting the laser has been opened and closed Symptom Long term stability beam pointing is poor Possible Causes Corrective Action The laser head is not properly Review Chapter 5 Installation and verify that the laser head is mounted mounted properly The routing mirrors are not If routing mirrors are used as part of the beam delivery setup ensure that they installed correctly are assembled and locked down correctly 7 3 Centennia TD Diode Pumped CW Visible Thin Disk Laser System 7 4 Chapter 8 Customer Service Warranty Customer Service At Spectra Physics we take great pride in the reliability of our products Considerable emphasis has been placed on controlled manufacturing meth ods and quality control throughout the manufacturing process Neverthe less even the finest precision instruments will need occasional service Our instruments have excellent service records compared to competitive prod ucts and we strive to provide excellent service to our c
38. g when the laser is turned on ERROR indicator yellow illuminates when there is an active interlock or a system failure and indicates that the diode laser power has been turned off To clear the error status turn off the keyswitch correct the underlying problem and cycle the AC power off and back on STOP button pressing this button closes the laser head shutter immedi ately Note that laser emission is still present inside of the laser head Power Supply Rear Panel 4 4 Emission Interlock Connector Connector Fuses EMMISION INTERLOCK Cl Umbilical Connector AC Power to the Laser Head Connector Figure 4 3 Centennia Power Supply Rear Panel SERIAL COM connector 9 pin D sub is reserved at present for use by Spectra Physics For information about using this connecto for remote computer control of the Centennia TD system using serial commands contact your Spectra Physics representative EMISSION relay connector 3 pin AMP provides a relay that can be used to turn on and off a user installed indicator that warns of laser emis sion See EMISSION Connector on page 4 5 for more information Controls Indicators and Connections INTERLOCK connector 2 pin AMP provides attachment for a user supplied safety switch These contacts must be shorted together before the laser will operate A defeating jumper plug Figure 4 4 is installed at the factory to permi
39. he text as shown here w Danger Laser radiation is present A Laser Radiation Danger Danger Condition or action may present a hazard to personal safety Condition or action may present an electrical hazard to personal safety Warning Condition or action may cause damage to equipment ESD ment Caution Condition or action may cause poor performance or error Note Text describes exceptional circumstances or makes a special refer ence Don t Do not touch Touch Warning Y Action may cause electrostatic discharge and cause damage to equip 9 Appropriate laser safety eyewear should be worn during this opera Eyewear Laub tion Required Refer to the enclosed documents and manual before operating or using this device xi Abbreviations These abbreviations may be found in this manual AC AOM AR CDRH CW DC E O fs HR IR OC ps PZT RF SCFH TEM Ti sapphire UV A alternating current acousto optic modulator antireflection Center of Devices and Radiological Health continuous wave direct current electro optic femtosecond or 1071 second high reflector infrared output coupler picosecond or 101 second piezo electric transducer radio frequency standard cubic feet per hour transverse electromagnetic mode Titanium doped Sapphire ultraviolet wavelength xiii Standard Units The following units abbreviations and prefixes are used in this Spectra Physics ma
40. ing STOP button This blocks laser emission but laser radiation remains present inside the laser head The EMIS SION indicators on the laser head and power supply turn off Turn the LASER ENABLE keyswitch on the power supply to OFF This terminates laser radiation The READY indicator on the power supply will turn off Remove the key to prevent unauthorized use Turn the AC power ON OFF switch on the power supply to OFF This shuts off electrical power to the power supply The green POWER indi cator will turn off If the system is not going to be used for some time for example over night turn the chiller off Otherwise it is recommended that the chiller be left on to reduce the warm up time 6 3 Centennia TD Diode Pumped CW Visible Thin Disk Laser System 6 4 Chapter 7 Caution W Maintenance Maintenance and Troubleshooting Neither the power supply nor the laser head of the Centennia TD system contain user serviceable parts The laser head in particular has been assembled in a clean controlled environment the sealed inner cavity is filled with an inert gas Removing the outer covers from either the laser head or power supply will void the warranty The Centennia TD laser head requires no routine maintenance There is no reason to remove the outer cover from the laser head there are no user serviceable parts inside the laser The cavity mirrors are permanently fixed in their optimum alignment at the factory
41. isk Laser System Notes 4 Notes Notes 5 Centennia TD Diode Pumped CW Visible Thin Disk Laser System Notes 6 Report Form for Problems and Solutions We have provided this form to encourage you to tell us about any difficul ties you have experienced in using your Spectra Physics instrument or its manual problems that did not require a formal call or letter to our service department but that you feel should be remedied We are always interested in improving our products and manuals and we appreciate all suggestions Thank you From Name Company or Institution Department Address Instrument Model Number Serial Number Problem Suggested Solution s Mail To FAX to Spectra Physics Inc Attention SSL Quality Manager SSL Quality Manager 650 961 7101 1330 Terra Bella Avenue M S 15 50 Post Office Box 7013 Mountain View CA 94039 7013 U S A E mail sales spectra physics com www newport com lasers
42. itation of voltage fluctua tions and flicker in low voltage supply systems for equipment with rated current lt 16 A EN 61000 4 2 EMC Part 4 Testing and measurement techniques Section 2 Electrostatic discharge immunity test EN 61000 4 3 EMC Part 4 Testing and measurement techniques Section 3 Radiated radio frequency electromagnetic field immunity test EN 61000 4 4 EMC Part 4 Testing and measurement techniques Section 4 Electrical fast transient burst immunity test EN 61000 4 5 EMC Part 4 Testing and measurement techniques Section 5 Surge immunity test EN 61000 4 6 EMC Part 4 Testing and measurement techniques Section 6 Immunity to conducted disturbances induced by radio frequency fields EN 61000 4 8 EMC Part 4 Testing and measurement techniques Section 8 Power frequency magnetic field immunity test EN 61000 4 11 EMC Part 4 Testing and measurement techniques Section 11 Voltage dips short interruptions and voltage variation immunity test Low Voltage Directive 73 23 EEC 1973 EN60825 1 2002 A1 A2 Part 1 Equipment classification requirements and user s guide safety of laser products EN 61010 1 2001 Safety requirements for electrical equipment for measurement control and laboratory use Part 1 General requirements I the undersigned hereby declare that the equipment specified above con forms to the above Directives and Sta
43. k 2 System Interlock Return Chapter 5 Installation This chapter provides detailed instructions and information for the initial planning and setup of the Centennia TD system hardware If you have not set up the laser before or you are moving the laser system to a new loca tion please review this section in detail Be sure to follow all recommended safety precautions while handling or storing the laser Be sure to install all laser safety devices before using the laser or offering it for use Refer to Chapter 2 Laser Safety for more information on these topics The power supply chiller and laser head together typically produce less than 500 W 1 7 kBTU per hour of waste heat a maximum value is about 1100 W 3 6 kBTU per hour Provide enough room cooling capacity to prevent overheating Installing the Laser Head The laser head should be secured to an optical table or other flat mounting surface Three slots are provided in the bottom edge of the mounting base for this purpose two near the output bezel and one at the center rear Three laser head clamps are supplied that can be used on tables with either metric 175 mm hole spacing or English 1 inch spacing Slot in base for mounting clamp both sides Slot in base for mounting clamp Figure 5 1 Base Slots for Mounting Clamps 5 1 Centennia TD Diode Pumped CW Visible Thin Disk Laser System To mount the laser head for general use secure the laser head to
44. lace of the Laser On message that is displayed during normal operation ON OFF AC power switch enables electrical power to the power supply POWER indicator green indicates that electrical power is applied to the power supply circuitry LASER ENABLE keyswitch starts or terminates the production of laser radiation inside the laser head The keyswitch provides interlock safety to prevent unauthorized personnel from using the laser when the key is turned to the OFF position and is then removed Turning the key to the ON position provides current to the diode pump laser and to the crystal oven in the laser head if the AC power switch is also turned on If the LASER ENABLE keyswitch is already in the ON position when the AC power switch is turned on the laser will not start If this occurs cycle the keyswitch off and back on READY indicator green when blinking indicates that current is supplied to the laser head and that the diode pump laser and the crystal oven are warming to temperature This indicator glows steadily when the laser is ready to operate Laser emission is present inside of the laser head when this indicator is either blinking or glowing steadily When the start sequence is initiated a high level of laser radiation is tem porarily present inside the laser regardless of the set power level This tran sient condition is produced by current applied to the diode pump laser as part of the process that wa
45. later date the specially designed containers assure adequate protection Instruments can be returned only in Spectra Physics containers The laser head arrives with the umbilical and water hoses attached The laser head with umbilical weighs approximately 20 kg 44 Ib it will be safer if two people work together to handle the laser head The power sup ply weighs about 8 kg 18 Ib and can be picked up by one person If only a small cart is available to move the system the laser head can be placed on top of the power supply on the cart Balance the laser head care fully as it is considerably longer and heavier than the power supply If your system was shipped with a rack mountable chiller move it separately from the laser head and power supply Warning Be careful when moving the laser head that the umbilical does not snag and pull the laser head from the cart System Components The Centennia TD laser system comprises these components e Centennia TD laser head with umbilical e Centennia power supply The Centennia TD laser head is water cooled An optional rack mountable recirculating chiller is available for supplying the specified water flow xvii Centennia TD Diode Pumped CW Visible Thin Disk Laser System Accessories xviii Verify that all components are present The laser head and power supply are shipped in one container the chiller if included is shipped in its own crate Included with the laser system is
46. least 6 inches of clearance from the front and back of the Centennia power supply to allow cool air to enter the front and heated exhaust air to exit the rear panel Inadequate cooling will cause the system to overheat and shut down Damage to components caused by insufficient cooling is not covered by the warranty Installation Mounting the Power Supply as a Stand Alone Unit Place the power supply in a convenient location within 4m of the laser head the length of the umbilical Be careful that the heat generated by the power supply does not adversely affect the laser Ensure that the electrical cables and umbilical are safely routed and not under any strain or compression Use caution when moving the laser head to ensure that the umbilical does not snag and pull the laser head to the floor Do not step on or roll objects over the umbilical Mounting the Power Supply in a Standard Rack Caution n An optional kit is available to mount the power supply into a standard 19 in 48 3 cm enclosed rack Place the rack in a convenient location less than 4 m the length of the umbilical from where the laser head will be located Be careful that the heat generated by the power supply will not adversely affect the laser Disconnect the umbilical from the power supply Slide the power supply into the rack rear panel first and onto the support structure shelf or rails Fasten the front panel of the power supply to the rack using the sc
47. mploys thermo electric coolers to stabilize the temperatures of the diode pump laser and the LBO assembly at their opti mum value The laser head must be cooled by a constant temperature water flow to remove excess heat from the unit A telescope system adjusts the output beam to its specified dimensions before it exits the laser head and a light pick off samples a portion of the beam as part of the power control loop The shutter which is opened and closed via electronic command provides a safe mechanical means to block the output beam The shutter default position is closed The all solid state Centennia power supply contains the control logic and power modules for the system The unit is compact and designed for table top placement All operation and monitoring of laser functions is provided by controls and indicators on the front panel The power supply is air cooled and requires no water or external cooling connections The power supply is auto ranging and operates from a standard 50 or 60Hz electrical utility from 100 to 240 Vac Neither the power supply nor the laser head of the Centennia TD system contain user serviceable parts The laser head in particular has been assembled in a clean controlled environment the sealed inner cavity is filled with an inert gas Removing the outer covers from either the laser head or power supply will void the warranty System Control Chiller Patents Introduction Operating the laser
48. ndards Bruce Craig Vice President Spectra Physics Newport July 1 2005 2 13 Centennia TD Diode Pumped CW Visible Thin Disk Laser System Sources for Additional Information Laser Safety Standards 2 14 Safe Use of Lasers Z136 1 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 Internet www osha gov 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 Canon Communications LLC 11444 W Olympic Blvd Los Angeles CA 90064 Tel 310 445 4200 International Electrotechnical Commission Journal of the European Communities EN60825 1 Safety of Laser Products Part 1 Equipment classification requirements and user s guide Tel 41 22 919 0211 Fax 41 22 919 0300 Internet www iec ch Cenelec 35 Rue de Stassartstraat B 1050 Brussels Belgium Tel 32 2519 68 71 Internet www cenelec org Document Center Inc 111 Indust
49. nk gt Beam N Wi Output N Coupler x N N N High Reflective Pump Beam Coating Mirror Figure 3 5 Thin Disk Laser Cavity Frequency Doubling Laser Description Thin disk laser technology enables high power diode pumped solid state laser designs of compact size that are exceptionally robust and stable as well as cost effective In the Centennia TD the high output power from the diode laser is used to pump the vanadate lasing medium The resulting 1064 nm output is con verted to visible light through frequency doubling also called second har monic generation in a nonlinear crystal The Centennia TD uses a critically phase matched temperature tuned lithium triborate LBO non linear crystal as its doubling medium Phase matching is a requirement in almost all applications of nonlinear optics in order to achieve an efficient conversion of the fundamental inci dent light to an output beam at a new wavelength In order to produce any significant output at the new wavelength the phases of the fundamental light wave and the converted light wave must stay in phase over a sufficient length in the nonlinear material to allow the conversion to take place In a nonlinear crystalline material however the indexes of refraction at the two wavelengths will be significantly different causing the two waves to become rapidly out of phase unless special techniques are employed One such technique takes advantage of the birefringent nat
50. ntional diode pumped lasers yet still produces a high quality beam suitable for printing and graphical applications for pumping other lasers and many other scientific and indus trial uses as well 1 1 Centennia TD Diode Pumped CW Visible Thin Disk Laser System The Laser System Laser Head Power Supply Caution 7 1 2 The Centennia TD system comprises these components e Centennia TD laser head with umbilical e Centennia air cooled power supply The Centennia TD laser head is water cooled An optional recirculating chiller is available for supplying the specified water flow The Centennia TD laser head includes the sealed laser cavity the shutter the emission indicators and the umbilical which is permanently attached and supplies electrical power and control from the power supply The sealed laser cavity encloses the optical resonator which contains the neodymium yttrium vanadate Nd Y VO laser thin disk and the diode pump laser and lithium triborate LBO doubling crystal The fundamental infrared beam produced by the vanadate disk is focused into a nonlinear crystal of LBO that generates the green output beam at 532 nm The LBO crystal is housed in an oven assembly that maintains the crystal at the optimum temperature for the frequency doubling process The green beam exits through a dichroic output mirror that confines virtu ally all of the infrared light inside the resonator An internal control system e
51. nual Quantity Unit Abbreviation mass kilogram kg length meter time second S frequency hertz Hz force newton N energy joule J power watt W electric current ampere A electric charge coulomb C electric potential volt V resistance ohm Q inductance henry H magnetic flux weber Wb magnetic flux density tesla T luminous intensity candela cd temperature Celsius C pressure pascal Pa capacitance farad F angle radian rad Prefixes tera 107 T deci 10 d nano 10 n giga 10 G centi 102 c pico 10 p mega 10 M milli 10 m femto 10 f kilo 109 k micro 109 u atto 1078 a XV Unpacking and Inspection Unpacking Your Laser Your Centennia TD laser system was packed with great care and its con tainer was inspected prior to shipment it left Spectra Physics in good condition Upon receiving your system immediately inspect the outside of the shipping crate If there is any significant damage holes in the crate for example insist that a representative of the carrier be present when you unpack the contents When you open the crate notify the carrier immediately if damage is apparent to the interior boxes Carefully inspect your laser system as you unpack it If you see any dents or scratches on the covers or so forth imme diately notify the carrier and your Spectra Physics representative Keep the shipping containers and packing materials If you need to return the system for service at a
52. ocker switch on the power supply front panel to ON a The green POWER LED illuminates on the front panel b The LCD screen displays the Spectra Physics logo during the brief boot up procedure c After system boot the Main LCD screen appears and displays 0 00W and Laser Off 6 1 Centennia TD Diode Pumped CW Visible Thin Disk Laser System Danger Laser Radiation 6 2 Note 9 4 Turn the LASER ENABLE keyswitch to ON If the keyswitch is already ON when the AC power is turned on the laser will not start Cycle the keyswitch OFF and then ON to start the laser a The green READY LED on the front panel blinks At this point laser radiation is present inside the laser head There is an initial spike in power as the diode pump laser is turned on and settles to its operating level Note that the shutter is closed at this point and all laser radiation is contained within the laser head b The advancing status bar on the LCD shows the progress of the warm up process The warm up will take approximately 1 minute depending on recent use of the system and its environment c When the system is ready for operation the READY LED glows continuously the status bar is completely filled and the LCD reads Laser On If the yellow ERROR indicator illuminates turn the keyswitch off Check the system connections and the make certain that the chiller is set correctly and is operating properly Refer to Chapter 7
53. ound state Since the rate of absorption of all frequencies exceeds that of emission the absorption coefficient at any frequency is positive If enough light of frequency v is supplied the populations can be shifted until N N Under these conditions the rates of absorption and stimulated emission are equal and the absorption coefficient at frequency v is zero If the transition scheme is limited to two energy levels N can never exceed N because every upward transition is matched by one in the opposite direc tion Laser Description However if three or more energy levels are employed and if their relation ship satisfies certain requirements described below additional excitation can create a population inversion where N gt N A model four level laser transition scheme is depicted in Figure 3 2 A photon of frequency v excites or pumps an atom from E to E If the E to E transition probability is greater than that of E to and if the life time of an atom at E is short the atom will decay almost immediately to E If E is metastable 1 e atoms that occupy it have a relatively long lifetime the population will grow rapidly as excited atoms cascade from above The atom will eventually decay to E emitting a photon of frequency v Finally if E is unstable its atoms will rapidly return to the ground state E keeping the population of E small and reducing the rate of absorption of v In this way th
54. r 60 Hz electrical supply from 100 to 240 Vac An optional kit is available to mount the power supply in a standard 19 rack Starting and stopping the laser is straightforward using the controls on the power supply as described in Chapter 6 Operation Control of the output power is by means of the dial control and LCD display on the power supply front panel The system can also be controlled by serial commands via the standard RS 232 interface on the back of the power supply For information about system integration of the Centennia TD e g mounting the power supply in a rack controlling the laser using serial commands etc contact your Spectra Physics representative Specifications Laser Description Table 3 1 Centennia TD Laser Output Characteristics Power maximum minimum Wavelength Spatial Mode Beam diameter at 1 e points Beam divergence full angle Polarization Power Stability Beam Pointing Stability Noise Boresight Tolerance nearfield farfield gt 5W 0 5 W 532 nm TEM go 2 3mm 10 lt 0 5 mrad gt 100 1 vertical 3 lt 5 urad C lt 0 4 rms 0 25 mm lt 10 mrad ISpecifications are subject to change without notice 2M lt 1 2 beam ellipticity lt 20 3Measured at the output face of the laser Horizontal polarization may be ordered as a factory installed option Measured over a 1 hour period after a 20 minute warmup Measured as far field
55. r use by you the customer It is provided to assist you in isolating some of the problems that might arise while using the system A complete repair procedure is beyond the scope of this man ual For information concerning the repair of your unit by Spectra Physics please call your local service representative A list of world wide service sites is included in Service Centers on page 8 3 Symptom Low power Possible Causes Corrective Action The beam is clipped Call your Spectra Physics service representative The chiller is not turned on or Verify that the chiller is turned on and its reservoir is full Make sure all the there is poor or no water flow water fittings are connected Check the chiller s filter screen at the pump and clean it if necessary Refer to the chiller manual The diode pump laser is Call your Spectra Physics service representative nearing its end of life Symptom High optical noise Possible Causes Corrective Action The chiller is not turned on or Verify that the chiller is turned on and its reservoir is full Make sure all the there is poor or no water flow water fittings are connected Check the chiller s filter screen at the pump and clean it if necessary Refer to the chiller manual 7 2 Maintenance and Troubleshooting Symptom Bad mode Possible Causes Corrective Action The beam is clipping the out Call your Spectra Physics service representative put tel
56. re Laser emission is blocked by the shutter When the shutter is opened laser emission will be at the selected power level However personnel must always employ safety practices appropriate for the maximum rated output of the laser including wearing approved safety glasses This green LED on the power supply blinks after the keyswitch is turned on to indicate that components in the laser head are warming to operating tem perature When the laser head is ready to operate this indicator glows steadily Laser emission is present inside of the laser head when the READY indicator is either blinking or glowing steadily When system is ready and the START button on the power supply is held in for 1 second the start sequence is activated that will open the shutter and allow the laser to emit its green laser beam When the button is first pressed the two emission indicators on the power supply and the two indi cators on the laser head start blinking to warn of impending laser emission After a 3 second delay the shutter is opened and the laser emits radiation 2 5 Centennia TD Diode Pumped CW Visible Thin Disk Laser System Laser Emission Indicators 2 6 When on the two yellow EMISSION indicators on the power supply see Figure 2 3 and the two yellow LEDs on the laser head see Figure 2 5 indicate that power is being supplied to the diode laser the shutter is open and emission should be present These indicators blink for 3 seconds
57. rews pro vided These front panel screws are only meant to secure the power supply in place not to support it Provide slides or rails to support the weight of the power supply Installing the Chiller Caution W Refer to the user s manual that came with your chiller for detailed informa tion on installing and starting the chiller Do not place the chiller above the laser the power supply or other delicate or electrical components If the chiller develops a leak dripping water may damage these components Mount the chiller on the floor table top or in a rack as appropriate The Centennia TD system is shipped with metric dimension water hoses which are about 4 m in length already attached to the laser head Position the chiller close enough to the laser head so that the cooling hoses from the laser head can reach the connections on the back of the chiller If you chose to use your own recirculating chiller 1t must meet the require ments of the Centennia TD in order to protect the laser from damage and to ensure its performance The output of the chiller should be 3 to 3 5 liters per minute of distilled water filtered to 100 um or smaller at a temperature of 20 0 5 C The maximum allowable water pressure at the laser head inlet is 5 bar Refer to Table 3 5 Chiller Requirements on page 3 13 for English units 5 3 Centennia TD Diode Pumped CW Visible Thin Disk Laser System Connecting the System R
58. rial Road Suite 9 Belmont CA 94002 Tel 650 591 7600 Internet www document center com Laser Safety Equipment and Training Laser Safety Guide Laser Institute of America 13501 Ingenuity Drive Suite 128 Orlando FL 32826 Tel 407 380 1553 or toll free 800 34LASER Internet www laserinstitute org Laser Focus World Buyer s Guide Laser Focus World Pennwell Publishing 98 Spit Rock Road Nashua NH 03062 Tel 603 891 0123 Internet Ifw pennnet com home cfm Photonics Spectra Buyer s Guide Photonics Spectra Laurin Publications Berkshire Common PO Box 4949 Pittsfield MA 01202 4949 Tel 413 499 0514 Internet www photonics com 2 15 Centennia TD Diode Pumped CW Visible Thin Disk Laser System 2 16 Chapter 3 Laser Description A Brief Review of Laser Theory Emission and Absorption of Light Laser is an acronym derived from Light Amplification by Stimulated Emis sion of Radiation Unlike thermal radiators which emit light in all direc tions the laser is an amplifier of light and because its output comprises photons that are identical in phase and direction its output beam is singu larly directional monochromatic and coherent Radiant emission and absorption take place within the atomic or molecular structure of materials Each electron occupies a distinct orbital that repre sents the probability of finding the electron at a given position relative to the nucleus The energy of an ele
59. rms the laser to its proper operating temperature Laser emission is blocked by the shutter When the shutter opens laser emission should be at the selected power level START button once the READY indicator glows steadily holding this button in for at least 1 second will initiate the sequence that opens the shut ter After a CDRH delay of 3 seconds the shutter will open and the laser beam will be emitted The laser comes on at the power setting shown on the LCD screen Laser EMISSION indicators yellow when blinking these two LEDs on the laser head indicate that current is supplied to the diode pump laser in the laser head the laser is producing laser radiation and the shutter will be opened in 3 seconds or less These indicators glow steadily when the shut ter is open and laser emission is present The two indicators are redundant for safety Centennia TD Diode Pumped CW Visible Thin Disk Laser System Power Adjustment Dial a rotating adjustment that sets the laser power level in units of Watts in hundredths of a Watt resolution The power level setting is shown on the LCD Display The operating range of power is from 0 5 W to 5 00 W the minimum adjustment is 0 05 W One full turn of the dial causes a change of 1 5 W The adjustment provided is relative the initial position of the dial corresponds to the power level when the laser is turned on i e turning the dial when the laser is off will not change the power settin
60. rning the Instrument for Repair Contact your nearest Spectra Physics field sales office service center or local distributor for shipping instructions or an on site service appointment You are responsible for one way shipment of the defective part or instru ment to Spectra Physics Use the original packing boxes to secure instruments during shipment If shipping boxes have been lost or destroyed we recommend ordering new ones Instruments can be returned only in Spectra Physics containers Removing Water from the System 8 2 Warning n Always drain the cooling water from the laser head and chiller before shipping Freezing may occur at high altitudes in the cargo hold of an aircraft and can cause damage Such damage is not covered by warranty To drain the laser head 1 Turn off the laser system and chiller 2 Disconnect the laser head cooling lines from the chiller and allow the lines to drain into a bucket 3 Use a shop vacuum or similar device to suck out any water that might remain in the laser head Because the cooling circuit in the laser head is designed to operate at less than about 70 psi 5 bar do not use high pressure air to blow it out Doing so can dislodge water seals in the laser head and damage it Such damage is not covered under your warranty To drain the chiller refer to the chiller user manual for detailed instruc tions Note that the cooling water may contain chemicals that are classified a
61. roduct as a result of or necessary for the operation of a laser incorporated into that product Follow the instructions contained in this manual to ensure proper installa tion and safe operation of your laser Maximum Emission Levels and Protective Eye Wear It is recommended that laser safe eye wear be worn at all times when the Centennia TD laser is on The following are the maximum emission levels possible for this Centennia TD product Use this information for selecting appropriate laser safety eyewear and implementing appropriate safety pro cedures These values do not imply actual system power or specifications Emission Wavelength Maximum Power 532 nm laser output wavelength second harmonic 6W 1064 nm fundamental operation wavelength lt 10 mW During normal operation the operator will not be exposed either to hazard ous diode laser or fundamental emission However removing the interior sealed laser head cover will not only invalidate the warranty but will also expose the operator to hazardous levels of infrared and invisible laser radi ation from both the diode pump laser and the fundamental vanadate output 2 3 Centennia TD Diode Pumped CW Visible Thin Disk Laser System Error Ready Power Emission LCD Indicator Indicator Indicator Indicators Screen E si POWER SET 5 00W 5 00w LASER ONIS ON OFF
62. ronmental Specifications ooooccorcccnron lh rn V FGG Hegulalloris reg A A Me IRAQ wa S RI M UBL er QUO A Ss V CDRH and UL Regulations 3253 e200 RE AEN E bo oto bead br dau Erb fee debe hrs V Warning Gonventions viua ok EE LEPA n Er RC A xi Abbreviations ioiei noc ede e a D Rc a ZO ea e D ca DU D ah uu ETT xiii Standard UNS riada AA E a a he XV Unpacking and Inspection 2 2 0 eee eee xvii Unpacking Your Laser 2 4 2 3 E Lhasa bee de bee A Wha as MUERE erra xvii System Components xvii ACCOeSSOLIOS ll nn eer E E tee cepacia nn e laret ed espere satya xviii Chapter 1 Introduction veut odo De ig gh tote Saw ee 1 1 The Gentennia TO 5s em A Se tie ete rum Be ORR ena eee RR ME ao 1 1 Thes Laser System mido 0 besten ead Mees Wad ar coal beg bud Cbr Mid boleh eked alee ds 1 2 Laser lead vu An Sed a wee tus RU ehm DAS eta Ge age PE T m SA eee 1 2 Power Supply nase Ye cated Folios Bees PENES sie ol i e yd aed 1 2 oystem Control i ert e mee b RA O Miwa xe P ERN MES 1 3 Chiller asis aora pen Bin ae A e oh 1 3 CIC mI rmm 1 3 Chapter 2 Laser Salety cis Rack ERR D Recon C CR QU ran 2 1 Hazatds A RA Ue aoi Macc deste qai de V RH Ro es m e CP are 2 1 Precautions For The Safe Operation Of Class IV High Power Lasers o ooooooccoococcoo ooo 2 2 Maximum Emission Levels and Protective Eye Wear 2 3 Safety Devices A Lex S pO EM ew 2 5 On Off AC Power Switch a4 oae spea raini ga daai RR nen 2 5 AC
63. s provide connection for the recirculating flow of cooling water from the chiller to the laser head The hoses have metric dimensions see Table 3 4 on page 3 12 You will need to provide con nectors to mate these hoses to the chiller These hoses are permanently attached to the laser head do not try to remove them Centennia Power Supply Power Supply Front Panel 4 2 Error Ready Power Emission LCD Indicator Indicator Indicator Indicators Screen ON OFF POWER SET 5 00W 5 00w LASER ON ON OFF Laser Enable Stop Start Power AC Power Switch ON OFF Keyswitch Button Button Adjustment Knob Figure 4 2 Centennia Power Supply Front Panel Controls Indicators and Connections LCD screen displays the power setting and the actual power output of the laser It also displays the progress of the warm up cycle at startup The requested power output of the laser is displayed in small characters in Watts to a hundredth of a Watt resolution e g 5 00 W The actual power output of the laser is displayed in large characters on the LCD Warm up begins when the LASER ENABLE keyswitch is set to ON The warm up takes a few minutes to complete progress is indicated by the advance of the bar from left to right on the bottom of the screen If the system encounters a fault a status code corresponding to the fault condition is displayed at the bottom of the screen in p
64. s hazardous materials Service Centers Customer Service Benelux Telephone 31 40 265 99 59 France Telephone 33 1 69 18 63 10 Germany and Export Countries Spectra Physics GmbH Guerickeweg 7 D 64291 Darmstadt Telephone 49 06151 708 0 Fax 49 06151 79102 Japan East Spectra Physics KK East Regional Office Daiwa Nakameguro Building 4 6 1 Nakameguro Meguro ku Tokyo 153 Telephone 81 3 3794 5511 Fax 81 3 3794 5510 Japan West Spectra Physics KK West Regional Office Nishi honmachi Solar Building 3 1 43 Nishi honmachi Nishi ku Osaka 550 0005 Telephone 81 6 4390 6770 Fax 81 6 4390 2760 e mail niwamuro 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 spectra physics com sales spectra physics com Internet www newport com Lasers 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 Centennia TD Diode Pumped CW Visible Thin Disk Laser System 8 4 Notes Notes 1 Centennia TD Diode Pumped CW Visible Thin Disk Laser System Notes 2 Notes Notes 3 Centennia TD Diode Pumped CW Visible Thin D
65. sing standard EN 61326 1 w Al A2 A3 1997 as listed in the official Journal of the European Communities Refer to the statements in CE Declaration of Conformity on page 2 13 Centennia TD Diode Pumped CW Visible Thin Disk Laser System Every effort has been made to ensure that the information in this manual is accurate All information in this document is subject to change without notice Spectra Physics makes no representation or warranty either expressed or implied with respect to this document In no event will Spec tra Physics be liable for any direct indirect special incidental or conse quential damages resulting from any defects in this documentation Finally if you encounter any difficulty with the content or style of this manual or encounter problems with the laser itself please let us know The last page of this manual is a form to aid in bringing such problems to our attention Thank you for your purchase of Spectra Physics instruments Environmental Specifications CE Electrical Equipment Requirements For information regarding the equipment needed to provide the electrical service listed in Specifications on page 3 11 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 liste
66. t is 0 05 W One full turn of the dial causes a change of 1 5 W The adjustment provided is relative the initial position of the dial corresponds to the power level when the laser is turned on i e turning the dial while the system is off will not change the initial power setting when the laser is turned on This yellow LED on the power supply glows when an interlock has been activated or an internal error has caused the laser to turn off or prevented it from turning on The STOP button closes the shutter immediately thereby blocking laser emission The laser remains on and laser radiation is present inside of the laser head If for any reason the shutter does not close the laser turns off immediately The laser head internal shutter is electromechanical and is controlled via the power supply front panel Its interlock fault and fail safe mode is the closed position The shutter is opened with the START button and closed with the STOP button Safety Interlock The Centennia power supply provides a remote safety interlock on the rear panel the INTERLOCK connector that can be wired to an external safety switch to stop laser emission close the shutter in the event the switch is opened However to ensure that the laser can operate even when this interlock is not used the Centennia power supply is shipped with a shorting jumper plug Figure 2 7 that defeats closes the interlock The INTERLOCK contacts must either be wired to
67. t operation without a safety switch See Safety INTER LOCK Connector on page 4 6 for more information D Figure 4 4 INTERLOCK Jumper Plug Umbilical connector provides attachment for the umbilical cable that provides monitoring control and diode laser drive current to the Centennia TD laser head AC POWER connector provides attachment for an IEC power cable to provide AC power to the Centennia power supply Connector Interface Descriptions Serial COM Connector Note EMISSION Connector E At present this serial connector is reserved for factory use For informa tion about system integration of the Centennia TD e g controlling the laser using serial commands contact your Spectra Physics representa tive This connector is used to turn on and off an optional user installed emis sion indicator When there is no laser emission i e the shutter is closed there is closure between the NC and C terminals and an open between the NO and C terminals The opposite is true when there is emission or emis sion is imminent Refer to the circuit diagram in Figure 4 5 below There is no power supplied by these terminals This circuit is rated for 30 Vac at 1 A The mating connector is AMP part number 350766 1 which uses male crimp pins AMP part number 350218 1 The AMP pins are designed for specific wire gauges so choose the appropriate wire Other connectors will fit these jacks including solder cup and IDC
68. t perpendicular to the beam direction through the crystal Above a threshold of pump power this temperature gradient leads to a refractive index gradient a thermal lens that focuses the laser beam itself The focusing of the beam in turn intensifies the thermal lens effect even further This ultimately limits the output power and beam quality and in extreme cases may even cause damage to the laser crystal The thin disk laser was developed to overcome these difficulties In this innovative design the laser crystal is formed as a disk only a fraction of a millimeter in thickness This disk receives a coating on one face that is highly reflective at both the laser wavelength and the pump laser wave length The coated face of the thin disk is then bonded to a heatsink Because the disk is so thin excellent cooling efficiency and uniformity can be achieved at high levels of pump energy density thereby avoiding ther mal lensing In order to achieve a sufficient degree of absorption of the pump light in the thin disk the diode laser pump beam light is reflected multiple times through the disk The output surface of the disk has an anti reflection coat ing A mirror that is partially transmitting at the laser wavelength reflects the output back into the thin disk gain medium in order for stimulated emission to extract all of the available gain Thin Disk Laser Crystal Pump Beam 7 7 7 Pd 7 gr 7 Pd Y Heat Output Si
69. to CE CDRH Warning Labels on page 2 11 Figure 2 8 CDRH Radiation Control Drawing 2 10 Laser Safety CE CDRH Warning Labels D FROM THIS APERTURE OID EXPOSURE CE WEEE CE Certification Label 3 Label 3 CDRH Aperture Label CE Aperture Laser Head 1 Label 2 VISIBLE AND INVISIBLE LASER RADIATION WHEN Service by qualified Wi OPEN AVOID SKIN OR EYE VIEH AND INVISIBLE LASER m 1 OID EYE OR SKIN EXPOSURE A 532om Mor OW personnel only TO DIRECT OR SCATTERED RADIATION CLASS IV LASER PRODUCT PX 1084nm Moz 10 mi SE RAN EN 60825 1 2002 SEE MANUAL 0452 0150 PARTS WITHIN Non Interlocked Service Warning CE Danger Housing Label 4 Label 5 Laser Radiation Label 6 SG Spectra Physics THIS PRODUCT IS MANUFACTURED UNDER ONE OR MORE OF THE FOLLOWING PATENTS 1335 Terra Bella Avenue Mountain View CA 94043 PATENT NUMBERS MANUFACTURED IN GERMANY DE 59 407 111 WO 2001022541 EP 0 911 920 EP 0 632 551 US 6711 184 DE 19746835 MODEL S N EP 0 869 591 DE 1 9946176 DOM Month Year EP 0 869 592 JP 2003 510821 US 5 553 088 CA 2 351 409 THIS LASER PRODUCT COMPLIES WITH 21 CFR 1040 AS APPLICABLE Model Serial Number Patent Label 7 Label 8 LINE VOLTAGE FREQUENCY 100 240V 50 60Hz Voltage Frequency Electrical Connection CE Caution Label 9 Label 10 Label 11 Figure 2 9 CE CDRH Warning Labels 2 11 Centennia TD Diode P
70. umped CW Visible Thin Disk Laser System Label Translations For safety the following translations are provided for non English speak ing personnel The number in parenthesis in the first column corresponds to the label number listed on the previous page Table 2 1 Label Translations Label No French German Spanish Dutch Aperture Ouverture Laser Austritt von sichtbarer Label Exposition Dan und unsichtbarer Laser 1 gereuse Un rayonne strahlung Bestrahlung ment laser visible ei vermeiden ou invisible est emis par cette ouverture CE Danger Rayonnement laser Sichtbare und oder Laser Visible et ou invisible unsichtbare Laserstrahl Radiation EXposition dan ung Bestrahlung von 6 gereuse de l eeil ou de Auge oder Haut durch la peau au rayonne direkte oder Streustrahl ment direct ou diffus ung vermeiden Laser Laser de classe 4 Klasse 4 EN 60825 1 2002 EN 60825 1 2002 532nm Puissance 532nm maximale Aus maximum 6W gangsstrahlung 6W 1064nm Puissance 532nm maximale Aus maximum 10mW gangsstrahlung 10mW Patent Ce produit est fab Dieses Produkt wurde Labels rique sous l un ou plu unter Verwendung einer oder mehrerer der fol genden hergestellt sieurs des brevets suivants 8 Por esta abertura se emite radiacion laser visible e invisible evite la exposicion Radiaci n l ser visible y o invisible Evitar la exposici n directa 6 dispersa sobre la piel o los ojos Producto Laser Clas
71. ure of nonlinear crys tals The indexes of refraction of the two light waves can be made to match exactly if the direction of propagation and the polarization orientation of the beams are carefully controlled This technique is referred to as critical phase matching Although LBO has a lower nonlinear coefficient than other materials it offers other critical advantages It produces no spatial walk off of the fundamental and second harmonic beams which preserves the high spatial mode quality and favors a long interaction length for higher gain and the crystal can be easily optimized for maximum conversion efficiency by sim ply changing its temperature with no realignment of the laser cavity In frequency doubling the second harmonic power P is given by o detrPol LO Poo A 5 where d is the effective nonlinear coefficient P is the fundamental input power 1s the effective crystal length 6 is a phase matching factor and A is the cross sectional area of the beam in the crystal Since the second harmonic output is dependent upon the square of the fun damental peak power very high conversion efficiencies can be achieved by placing the doubling crystal within the laser resonator itself to take advan tage of the high circulating intensity this is called intracavity frequency doubling This is the technique used in the Centennia TD 3 7 Centennia TD Diode Pumped CW Visible Thin Disk Laser System
72. ure to high voltage electrical circuits present in the laser power supply and associated circuits can result in shock or even death e Possible health risks are present if pressurized hoses cylinders liquids and gasses used in laser systems are damaged or misused 2 1 Centennia TD Diode Pumped CW Visible Thin Disk Laser System Precautions For The Safe Operation Of Class IV High Power Lasers Wear protective eyewear at all times selection depends on the wavelength and intensity of the radiation the conditions of use and the visual function required Protective eyewear is available from suppliers listed in the Laser Focus World Lasers and Optronics and Photonics Spectra buyer s guides Consult the ANSI and ACGIH standards listed at the end of this section for guidance Maintain a high ambient light level in the laser operation area so the eye s pupil remains constricted reducing the possibility of damage To avoid unnecessary radiation exposure keep the protective cover on the laser head at all times Avoid looking at the output beam even diffuse reflections are hazardous Avoid blocking the output beam or its reflections with any part of the body Establish a controlled access area for laser operation Limit access to those trained in the principles of laser safety Post prominent warning signs near the laser operating area Figure 2 1 Set up experiments so the laser beam is either above or below eye level Provide en
73. using Spectra Physics patented technology Realigning the cavity optics in the field is not necessary align ment at the factory is performed using special tooling To retain a clean intracavity environment all components are cleaned to stringent standards prior to assembly and alignment at the factory The inte rior of the laser is filled with an inert gas and the cover is sealed It can only be removed by an authorized service engineer in an environment specified for cleanliness humidity and temperature Removing the sealed cover in the field will compromise the cleanliness of the intracavity space allow the inert gas to escape degrade laser performance and void the warranty Replacing the diode module in the laser head is not permitted except when performed by someone trained by Spectra Physics Call your Spectra Phys ics service representative when you suspect a low power diode module or when its optical fiber is damaged and the diode module needs replacement All parts that normally come in contact with laboratory or industrial environments retain surface contamination that can be transferred to optical components during handling Indeed skin oils can be very damaging to optical surfaces and coatings and can lead to serious degradation problems under intense laser illumination It is therefore essential that only clean items come into contact with the optical components and the mechanical parts immediately surrounding them that are us
74. ustomers in two ways by providing the best equipment for the price and by servicing your instruments as quickly as possible Spectra Physics maintains major service centers in the United States Europe and Japan Additionally there are field service offices in major United States cities When calling for service inside the United States dial our toll free number 1 800 456 2552 To phone for service in other coun tries refer to Service Centers on page 8 3 Order replacement parts directly from Spectra Physics For ordering or shipping instructions or for assistance of any kind contact your nearest sales office or service center You will need your instrument model and serial numbers available when you call Service data or shipping instruc tions will be promptly supplied To order optional items or other system components or for general sales assistance dial 1 800 SPL LASER in the United States or 1 650 961 2550 from anywhere else All parts and assemblies manufactured by Spectra Physics are uncondition ally warranted to be free of defects in workmanship and materials for the period of time listed in the sales contract following delivery of the equip ment to the FOB point Liability under this warranty is limited to repairing replacing or giving credit for the purchase price of any equipment that proves defective during the warranty period provided prior authorization for such return has been given by an authoriz
75. x and y positions after a 20 minute warmup Table 3 2 Utilities AC power input Power consumption Centennia Power Supply Heat dissipation into room typical 100 to 240 Vac 10 50 60 Hz single phase 500 W typical 1100 W maximum 460 W Note that the chiller will also produce heat Consult your chiller manual for details Table 3 3 Fuse Ratings for F1 and F2 Power Supply Supply Voltage Rating Type Centennia TD 100 240 Vac 50 60 Hz 10A T10A 250V Centennia TD Diode Pumped CW Visible Thin Disk Laser System Table 3 4 Dimensions and Weight Laser Head size w x h xd 5 31 x 4 02 x 19 49 in 13 5 x 10 2 x 49 5 cm weight 44 Ib 20 kg umbilical length 13 ft 4 m minimum static bend radius 6 in 15 cm water hoses length 13 ft 4 m ID 6 mm OD 8 mm Centennia Power Supply size w x h x d 13 7 x 5 26 x 16 43 in 34 9 x 13 35 x 41 74 cm weight 17 6 Ib 8 kg Umbilical and hose lengths are approximate head Failure to do so will result in poor performance and possibly Warning t It is critical that the chiller meet the requirements for cooling the laser cause damage to the laser Such damage is not covered by the warranty The following requirements must be met by the chiller in order to properly cool the Centennia TD laser head Refer to the manual provided with the chiller for its dimensions specifications and utility requirements e The chiller must
76. ystem ors esisi mene pra a Ep rh nn 3 8 The Centennia TD Laser Head 3 8 The Centennia Power Supp 3 10 System Control sissa iaa eed ee ee ee 3 10 SpOCITICallOniS 2 eres dere etas t eta EE 3 11 Outline Drawings sso a emm RE Ee A ae a 3 13 Chapter 4 Controls Indicators and Connections 4 1 The Centennia TD Laser Head 4 1 onmi M LAXE 4 1 Indieat rs s tius ese EE one EE 4 1 Bcc po er E AE Rae Fagan ase ae en ANE ee ak a A aoe 4 2 Gonriectlors An A Lo mcus tA LM Ad Rb dd a elc E 4 2 Centennia Power Supply ooocccc hh rrr 4 2 Power Supply Front Panel 4 2 Power Supply Rear Panel 4 4 Connector Interface Descriptions 4 5 Serial COM Connector css visade oA E hh hh rn 4 5 EMISSION Connector 4 5 Safety INTERLOCK Connector 4 6 Chapter 5 Installation zu rererere nikuri ERR RR E Rx ee 5 1 Irnistalling the Laser Head au FERES BAe BINOS BERND Ow AI Shea 5 1 Installing the Power Supply e rrace saa RR I RI 5 2 Mounting the Power Supply as a Stand Alone Unit 5 3 Mounting the Power Supply in a Standard Rack 5 3 Installing the Chill r 2r a 342 EE 5 3 Connecting the System no ia an ae amp ORS EIE ERE eate E 5 4 Moving he Systeme snb Eia i Ee a Er be de eee E eid ea n edd ui 5 5 Allghiment A ss eR aw dx erc erm xe aes Bas Aree a a Ica Me ale doa deae a 5 5 Chapter 6 Operation 3 252 ee ee 6 1 System Startup and Shutdown asi ge eaa EEV een nn 6 1 Turning the Laser On odr disier a

Centennia TD.book - Spectra

Contents

Download Pdf Manuals

Related Search

Related Contents