Page 1: ...Quanta Ray Pulsed Nd YAG Lasers Instruction Manual iia IIIIIlIIIIIflhIIIIiliii 11111 IIlIllhIlllhIllllhIIIfII IIIllhlIIOhlllllflIllhI GCR 12 GCR L4 GCR 18 Spectra Physics SpectraPhysics Lasers 4...
Page 2: ...GCR 12 GCR 14 GCR 16 GCR 18 Spectra Physics Spectra Physics Lasers 1330 Terra Bella Avenue Post Office Box 7013 Mountain View CA 94039 7013 International Headquarters Siemensstrasse 20 D 61 00 Darmst...
Page 3: ...to install and set up your laser system The Service and Repair section is intended both as an aid to help you guide your field service engineer to the source of problems and as a guide to repairs you...
Page 4: ...s Chapter 2 Laser Safety Precautions for the Safe Operation of Class IV High Power Lasers Focused Back Reflection Safety Maintenance Required to keep this Laser Product in Compliance with Center for D...
Page 5: ...Remote Reset 4 4 Serial Poll Status Byte 4 5 SW2 DIP Switch Setting 4 6 RS 232 C Serial Interface 4 6 Operation 4 6 Data Transfer and Handshaking 4 7 SW1 DIP Switch Setting 4 8 SW3 DIP Switch Setting...
Page 6: ...ir Purge System 6 i Maintaining the HG 2 6 i Replacing the Deionizing Water Filter 6 2 Procedure 6 2 Replacing the Air Filters 6 3 Procedure 6 3 Replacing the Flash Lamps 6 4 Procedure 6 4 Chapter7Ser...
Page 7: ...r a Single Line 1 9 Figure 1 7 Etaton Loss Minimum Tuned to Laser Gain Maximum 1 9 Figure 1 8 Simplified Block Diagram of GCR Series Electronics 1 12 Figure 2 1 Radiation Control Drawing 2 5 Figure 2...
Page 8: ...8 Table 4 3 SW1 Mode Select Settings 4 8 Table 4 4 Sample a Command Functions 4 11 Table 4 5 SELECT 1 WRITE Command Functions 4 12 Table 4 6 SELECT 2 WRITE Command Functions 4 13 Table 5 1 Summary of...
Page 9: ...J power watt W electric current ampere A electric charge coulomb C electric potential volt V resistance ohm W inductance henry H magnetic flux weber Wb magnetic flux density tesla T luminous intensity...
Page 10: ...xceptional circumstances or reference CAUTION Statement to warn against or to prevent poor perfomance or error WARNING Statement to warn of possible damage to equipment DANGER Statement to cover situa...
Page 11: ...to it Each electron occupies a distinct orbital that represents the probability of finding the electron at a given position relative to the nucleus Each orbital has a charac teristic shape that is def...
Page 12: ...cident photon matches the energy difference between levels i e hv E 2 E 1 1 where h is Planck s constant and v is the frequency of the photon Likewise when an atom excited to E 2 decays to E 1 it lose...
Page 13: ...be shifted until N 2 N 1 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 t...
Page 14: ...ne laser can be used to pump another e g a liquid dye laser can be pumped by a pulsed Nd YAG laser and an electric discharge is generally used to excite gaseous media like argon or krypton Nd YAG as a...
Page 15: ...1319 1338 and 946 nm all have lower gain and a higher threshold than the 1064 nm transition In normal operation these factors and wavelength selective optics limit oscillation to 1064 nm A laser made...
Page 16: ...d a Pockels cell With no voltage applied the Pockels cell does not affect the polariza tion of light passing through it and the Q switch functions as follows The polarizer vertically polarizes light e...
Page 17: ...ors provides feedback to the active medium Photons emitted parallel to the optical axis of the cavity are reflected returning to interact with other excited ions Stimulated emission produces two photo...
Page 18: ...e light it produces to be reflected through the rod which is placed at the other focus Uniform cooling is also essential to optimal performance of pulsed Nd YAG lasers When heated the Nd YAG rod becom...
Page 19: ...a bandpass filter introducing enough loss in other modes to prevent them from reach ing the lasing threshold Figure 1 7 The coherence length the distance over which the output beam maintains a fixed p...
Page 20: ...sidual input wavelength linearly polarized In Type LI the input polarization is at an angle between the extraordinary and ordinary axes while the out put remains polarized along the extraordinary axis...
Page 21: ...ansion coefficient and a high ability to distribute heat evenly causing a constant zT along the length of the structure Graphite composite such as that used in the OCR series resonators have the lowes...
Page 22: ...in Chapter 9 Service and Repair 4 A 0 switch Mode To A Trigger fl_________ B SCR Gate Current C Lamp Current D 0 switch Delay E Advanced Sync Delay F Advanced Sync G Fixed Delay H 0 switch Sync I 0 sw...
Page 23: ...delay D fires a fixed delay 0 Subsequently the pulse generator is fired H providing a sync sig nal and triggering the electro optic driver Marx bank The high voltage output of the Marx bank I changes...
Page 24: ...red in the nearfield 1 m between the FWHM points 4 Harmonic energies are spec fIed after separation using dichroic mirrorpairs 532 nm energies are specified using Type II second hannonic generation SH...
Page 25: ...he 1064 urn pulse width to approximately 2S us and reduces the pulse energy by approximately 10 Shortpulse mode available on seeded versions on special request only 2 Pulse to pulse stabilizyfor 99 of...
Page 26: ...230 0 mm 40 25 x 13 48 x 9 06 in Power Supply 590 0 x 495 0 x 548 0mm 23 25 x 19 50 x 21 56 in Weight Laser Head 26 kg 57 ib Power Supply 70 kg 154 ib 1 All specflcations subject to change without no...
Page 27: ...Avoid wearing reflective jewelry while using the laser Use protective eyewear at all times Selection depends on the wavelength and intensity of the radiation the conditions of use and the visual funct...
Page 28: ...n Perform ance Standards for Laser Products United States Code of Federal Regulations 21CFRI 040 10 d Any electronic product radiation except laser radiation emitted by a loser product as a result of...
Page 29: ...time delay between turn on of the emission indicator and starting of the laser it must give enough warning to allow action to avoid exposure to laser radiation 5 Verify that removing the cover shuts...
Page 30: ...ew York NY 10036 Tel 212 642 4900 A Guide for Control of Laser Hazards American Conference of Governmental and Industrial Hygienists ACGIH 6500 Glenway Avenue Bldg D 7 Cincinnati OH 45211 Tel 513 661...
Page 31: ...rtification and Naming Emission Label Identification Label Logotype Indicator Protective Housing Interlock Far Side Back Key Activated EMaster Control I r Emission Indicator ON Lamp Remote Interlock j...
Page 32: ...el AIBtS AND INVISIBLE ER RADIATION EMITTED FROM ThIS APERTURE AVOID EXPOSURE Aperture Label DANGER k VISIBLE AND INVISIBLE I LASER RADIATiON WHEN OPEN I AND INTERLOCK DEFEATED I AVOID EYE OR SKIN EXP...
Page 33: ...provided for reference only it is not intended as a guide to the initial installation and set up of your laser Please call your service representative to arrange an installa tion appointment which is...
Page 34: ...with distilled water WARNING Avoid spilling water on the control board which contains high voltage circuitry 2 Set the laser controls as follows Control Setting Circuit Breaker Closed Key Switch ON L...
Page 35: ...reservoir to capacity Shove the return line back into the hole of the reservoir cover Controls and Connections Remote Control Module SIMMER indicator glows when the flash lamp simmer current is on LA...
Page 36: ...t the 0 SW ADV SYNC output of the power supply its range of adjustment is 500 nsec Refer to Controls and Connec tions Power Supply OUTPUT Connectors Q SWitch ADVance SYNC Output for signal specificati...
Page 37: ...ates after the power supply circuit breaker is closed and the key switch is turned on The button serves as an emission indicator glowing whenever the laser is on Controls and Connections Power Supply...
Page 38: ...ter 4 Analog TrL Computer Interface for details REMOTE Connector Accepts a 37 pin D connector from the remote control cable COMPUTER Connector Access to the basic computer port 50 pin D connector POWE...
Page 39: ...condition monitor the desiccant cartridge which is mounted behind the control panel can be seen through the horizon tal row of ventilating holes above the flow meter As the desiccant is consumed its c...
Page 40: ...al optical pulse DANGE HIGH VOLTAGE 5 kV is present at these connectors Shut offthe laser press the OFF button before changing outputs Figure 3 5 Q switch Driver Marx Bank Box Emission Indicator The i...
Page 41: ...rols as follows Control Setting LAMP ENERGY START Q SW DELAY 25 REPRATE lOpps Q SW MODE LONG PULSE COMPUTER toggle switch INTERNAL SINGLE SHOT toggle switch SINGLE SHOT LAMP toggle switch ON 2 Make su...
Page 42: ...itch the Q SW MODE to Q SW Obtain another burn pattern by pressing the SINGLE SHOT FIRE button once If the burn pattern remains symmetrical you can safely raise the LAMP ENERGY to maxi mum and increas...
Page 43: ...OPIB Setup and programming for each is described in detail in this chapter Connectors for both ports are located on the control panel of the power supply to the right of the REMOTE connector The OCR...
Page 44: ...rface and use it The CIM 1 module comprises three components power supply stan dard interface pc board the bottom pc board Figure 4 1 and the proprietary interface pc board the top pc board The CIM 1...
Page 45: ...c Diagnostic Functions PFN voltage monitor Simmer voltage monitor System interlock monitor Computer interlock monitor Power On Default State and System Initialization When the system is first turned o...
Page 46: ...rs operate in both directions The CIM 1 is just such a device When the C1M 1 is properly programmed the controller will execute data transfers to and from it via the IEEE 488 bus Command strings sent...
Page 47: ...inishes executing a command It is reset 0 during the execution of a command Bit 1 is set when the CIM 1 has finished executing the SAMPLE command and response data is ready for output to the controlle...
Page 48: ...address that is different from that of all other devices attached to the same bus Dll switch SW2 on the standard interface board sets the address from 0 to 31 The factory setting is 25 Table 4 1 SW2 D...
Page 49: ...uest To Send 4 CTS CTS 5 Clear To Send 5 RTS DSR 6 Data Set Ready a 6 DTR DCD 8 Data Carrier Detect a 8 DCD DTR 20 Data Terminal Ready 20 DSR 7 Signal Ground 7 1 Protective GrouncL 1 Figure 4 3 Standa...
Page 50: ...arameters The factory setting is eight bit character length parity disabled odd even is ignored and two stop bits Table 4 3 SW1_Mode_Select_Settings Switch Number Switch Position Condition Switch Posi...
Page 51: ...rds and keywords may contain either upper or lower case alpha characters Spaces and all nonprintable characters except LF are ignored by the CIM 1 Consecutive delimiters are inter preted as a single d...
Page 52: ...NCLOCKED where p 4 5 6 or 7 For the CIM 1 to work properly every program must begin by ini tializing four internal CIM 1 ports using the CONFIGURE command once for each port Example These four BASIC s...
Page 53: ...of the two groups WRITE p n where p 4 5 6 or 7 and n a four bit binary number 0000b to hub or a decimal equivalent from 0 to 15 The WRiTE command sets and resets four control lines at a time n that be...
Page 54: ...xlxxb External Q switch fire enabled x0xxb External Q switch fire disabled lxxxb System set for repetitive firing Oxxxb System set for single shot WRITE 6 xxxlb Single shot trigger pulsed xxx0b Single...
Page 55: ...remote control box will light and the OCR is disabled until the error is cleared by writing a correct command sequence SELECT 1 WRITE 6 n Controls lamp trigger lamp blank analog strobe and single sho...
Page 56: ...o reset the watchdog an interlock fault results and the system shuts down The computer interlock function can be defeated by setting the com puter interlock enable line low Two diagnostic LEDs indicat...
Page 57: ...required for setting the PFN voltage it is neces sary to correct for an inherent offset in the electronics Measure the real sense voltage at TP24 on the control pe board or by sampling PFN voltage mon...
Page 58: ...te SELECT 2 WRITE 6 n sets lower 4 bits WRITE 7 m sets upper 4 bits Example To set a rep rate of 12 pps count 255 204 15 m TNT 12 16 n count 16 x m 12 Plug in the values for m and n SELECT 2 WRITE 6 1...
Page 59: ...16 x m or n 103 16x6 7 Plug in the values for m and n SELECT 2 WRITE 4 7 WRITE 5 6 Sample Analog to Digital Conversion Actual PFN voltage is four times the sampled voltage To find the actual PFN volt...
Page 60: ...er Thrn off power Example 2 Start simmer assumes power is on see Example 1 PRINT 1 SEL 1 PRINT 1 WRI 6 OO1OB PRINT 1 SET 2 0 Analog read Set PFN to 0 V Example 3 Q switch off lamps at 10 Hz 60 U assum...
Page 61: ...trigger and single shot off Enable external lamp fire Enable single shot and Q switch fire Thgger Q switch Single shot Send a lamp trigger Thin off single shot and lamp trigger Result 0 switch will f...
Page 62: ...RINT 1 WRI 7 OO1OB ON TIMER 5 GOSUB CLOCKPULSE TIMER ON WHILE 1 WEND END CLOCKPULSE PRINT 1 WRI 7 OO11B PRINT 1 WRI 7 OO1OB Open UIB digital ports Disable computer interlock clock off Enable computer...
Page 63: ...hock so change tem peratures slowly They are also water soluble so avoid getting them wet and maintain a low relative humidity in their envi ronment Check the desiccant weekly and have it changed by a...
Page 64: ...Vertical I Horizontal I 0 Horizontal I Vertical I 0 Vertical II Horizontal II 0 Horizontal II Vertical II 0 355 Vertical I Vertical I T Horizontal I Horizontal I T Vertical II Vertical II T Horizontal...
Page 65: ...ptical axis to change the polar ization of the output Clamping screws lock the polarization in the desired orientation Installing the HG 2 The HG 2 was optically aligned at the factory so the result o...
Page 66: ...nt screw next to it Repeat with the other vertical adjustments 8 Connect the purge system to the harmonic generator and purge for 15 mm before proceeding 9 Turn on the laser and check for clipping of...
Page 67: ...Q switch off mode 4 Switch to the 0 SWitch mode slightly above threshold LAMP ENERGY around position on the control then angle tune the crystal for maximum output at the wavelength of interest 5 Mjus...
Page 68: ...c crystals Its range is approximately 30 50 C over 20 turns CHANNEL 2 HEATER indicator glows as the controller heats the third and fourth harmonic crystals The lamp will turn on and off periodically a...
Page 69: ...the HEATER indicators They should remain on for several minutes while the crystals warm up Both lamps will blink peri odically when the temperature is stable Try to operate as close to room temperatur...
Page 70: ...y which is mounted behind the power supply control panel can be seen through the horizontal row of ventilat ing slots above the purge controls As its desiccant is consumed the color changes from blue...
Page 71: ...p on the hose remove the hose from the top of the filter cartridge Keep the hose vertical and hang it over the edge of the plastic shroud to prevent water from leaking from it Tape it in place to insu...
Page 72: ...the reservoir level ever drops below half turn off the pump and add more water 11 Replace the power supply cover Replacing the Air Filters The three air filters input oil filter output particle filte...
Page 73: ...tighten the band clamps 7 Follow steps 1 and 2 in reverse order to reconnect the air hoses and replace the power supply cover Replacing the Flash Lamps For optimal performance the lamps should be repl...
Page 74: ...fingers Clean the new lamps with methanol 8 Reverse steps one through six to install a new lamps Insert the lamp cathode end black lead first The anode end is identified by a red mark on its electrod...
Page 75: ...eaks occur turn on the water pump and inspect again at full pressure If there are no leaks after 5 sec the seals are tight Turn off the laser activate the cover interlock and install the laser head co...
Page 76: ...When the CIM4 option is used commands may be sent via the RS 232 C or IEEE 488 interface Refer to Chapter 4 Computer Interface Module CIM 1 for instructions Analog Signals Analog voltages control the...
Page 77: ...ctor on the power supply panel The fixed delay provides the timing reference against which the variable delay is compared The advance sync pulse generator shapes the wave form to meet output signal re...
Page 78: ...n rate without adversely affecting focusing of the Nd YAG rod To do so select the 10 Hz oscillator at the lamp source then fire single shots at a programmed rate Inhibit Switch Applies voltage to the...
Page 79: ...from the 15 V power supply and it must be wired using a twisted wire pair Do not ground the interlock grounding will blow a fuse in the 15 V supply which opens the interlock loop and prevents startin...
Page 80: ...r the LAMP SYNC OUTPUT on the power supply pan el and the lamp triggered monitor on the computer pin 47 The SCR pulse generator conditions the output of the lamp sync pulse generator for the SCR drive...
Page 81: ...and three P S INHIBIT flash when the laser is in the normal operating mode the LEDs are located on the power supply control PC board After a half second delay the start circuit ignites the flash lamp...
Page 82: ...cf d t 11 4 C C c7 5 D L C cJ Sb 1 L 4 Th c i s 4 V 9Hi r V r r i U 0 Q V C U a 0 a U 6 F 3 U 1 ____ ii 3...
Page 83: ...086S Marx bank assembly 0004 2087S Lamp kit Includes incandescent lamp power ON indicator 9800 0070 power supply and incandescent lamp remote ON OFE Relay K501 power to switching simmer supplies 4500...
Page 84: ...instructions or for assistance of any kind contact your nearest sales office or service center providing the in strument model and serial numbers Service data or shipping instruc tions will be prompt...
Page 85: ...ill only return instruments in Spectra Physics containers Service Centers Australia Spectra Physics Pty Ltd 2 4 Jesmond Road Post Office Box 141 Croydon Victoria 3136 Telephone 03 723 6600 Fax 03 725...
Page 86: ...he Netherlands Spectra Physics B V Prof Dr Dorgelolaan 20 Post Office Box 2264 5600 CG Eindhoven Telephone 040 45 18 55 Fax 040 466097 Switzerland Spectra Physics AG Hegenheimermattweg 65 CH 4123 Alls...
Page 87: ...unswick Road Suite N40 Piscataway NJ 08854 4175 Telephone 800 456 2552 Telephone 921396 Fax 908 981 0029 Western United States Spectra Physics Lasers 1330 Terra Bella Avenue Post Office Box 7013 Mount...
Page 88: ...quire a for mal call or letter to our service department but that you feel should be remedied We are always inter ested in improving our products and manuals and we appreciate all suggestions Thank yo...
