Laser SL335
Contents
1. Optical parts in the laser such as harmonic generator and output mirrors are vulnerable to severe damage if a small percentage of the output laser beam is reflected and focused back into the laser For instance a common uncoated positive simple lens will reflect about 4 of the beam at each surface The first surface reflection will diverge in the backward direction but the second surface reflection will focus and at the focus the intensity will be very high often enough to cause optical damage Even surfaces with anti reflection coatings may back reflect focused energy enough to cause damage 5 To avoid this hazard minimize focused back reflections direct them off axis to a harmless area or into an energy trap Damage due to back reflections is not covered by any EKSPLA warranty 2 5 Electrical safety When the equipment is operated with all safety covers in place then operating the controls available on the units in power supply Cabinet does not present the operator with an electrical hazard The equipment must not be operated with any covers removed and or interlocks by passed or defeated Only competent personnel must be allowed access to the equipment BEFORE REMOVING ANY COVERS OR PANELS a The equipment must be isolated from the mains supply elsewhere Allow 2 minutes to elapse from isolating the supply to ensure that energy stored in the system has sufficient time to dissipate b Certain actions specified in the f2. 2 cc scscecseseeseeeseeeesecseeceseessseeesareesceseses 38 10 3 Adjustment of SBS Compressor nananana 40 10 4 Adjustment of amplification system ooooconoccnnocnnoncnnoonncnononnnnncnnnnnonnnonnnnnnnos 41 10 5 Replacement of Nd YAG rods u s nananana 41 11 COMPONENTS sr eee 42 12 SPARE PARTS AND ACCESSORIES ANAKAN KABAN NGA 42 13 WARRANTY STATEMENT vasen 43 14 TESTING DINER 44 15 TECHNICAL PASSPORT kA TANA APA AA 45 1 STANDARD SPECIFICATION VISIBLE AND OR INVISIBLE RADIATION AVOID EYE OR SKIN EXPOSURE TO DIRECT REFLECTED OR SCATTERED RADIATION Nd YAG 1064 532 355 266 nm max 600 mJ pulse 0 15 2 0 ns CLASS IV LASER PRODUCT WAVELENGTH nm 1064 532 PULSE DURATION ps 150 550 JITTER ns Standard Deviation PULSE ENERGY mJ 500 at 1064 nm 240 at 532 nm PULSE ENERGY STABILITY Yo 12 5 at 1064 nm Standard Deviation 7 at 532 nm BEAM POLARIZATION vertical at 1064 nm horizontal at 532 nm BEAM DIAMETER mm BEAM MODE TEM0Q0 near Gaussian BEAM DIVERGENCE mrad at 1064 nm full angle at 1 e MAX REPETITION RATE Hz WATER CONSUMPTION l min max 20 C 2 SAFETY PRECAUTIONS 2 1 Safety Features and Compliance to Government Requirements This laser is a fourth class laser product according to radiation danger degree and by definition relates to certain safety and fire hazards The following features are incorporated into the laser to conform to several government requireme
3. Fig 5 Scheme of master oscillator This negative feedback is used for selection of single longitudinal mode At the same time the flash lamp discharge starts the high voltage 3 kV is applied to electrode a to close the oscillator s cavity when the energy stored in the Nd YAG rod is below a certain level Flash lamp is continuing its discharge excitation of active element for 100 us FWHM and when energy stored in active element is exceeding that certain level that Q switch can not hold light starts to escape from the cavity free running When lasing appears part of light reflected by polarizer 3 hits PIN photodetector Voltage generated by the FBC electronics and applied to the electrode c is proportional to the light intensity registered by the PIN photodetector Increased electrode voltage results in light polarization change and the bigger portion of light energy rejected by the polarizer 3 In result the negative feedback system allows master oscillator to keep lasing at certain low level for prolonged time several tens of microseconds During this time single longitudinal mode single frequency is establishing due to the selective properties of Fabry Perot etalon 9 and lower gain for the other frequencies YAG Cr crystal 4 improves single longitudinal mode selection 14 Optimal duration of free running for single longitudinal mode establishing is usually 15 20 us However time of free running beginning depends
4. push button switch with an integrated indicator enabling flash lamp power supply operation from either internal or external triggering source Illuminated when triggering is enabled e TRIGGERING OFF B2 push button switch disabling power supply triggering e AMPLIFIER ON OFF S1 rocker switch enabling disabling laser amplifier s operation In position OFF this switch stops the simmer of amplifier flash lamp e POWER S2 main switch of the power supply rocker type switch with an integrated indicator Illuminated when power supply is on e OSCILLATOR VOLTAGE P1 multi turn tuner with an integrated locking lever enabling oscillator s flash lamp pump level adjustment setting the oscillator s capacitor bank voltage level The capacitor bank voltage is indicated on the LED display Maximum voltage is 1000 V e AMPLIFIER VOLTAGE P2 multi turn tuner with an integrated locking lever enabling amplifier s flash lamp pump level adjustment setting the amplifier s capacitor bank voltage level The capacitor bank voltage is indicated on the LED display On the PS 222CO cooling unit POWER S3 main switch of the cooling unit rocker type switch with an integrated indicator Illuminated when cooling system is on TEMPERATURE P3 multi turn tuner with an integrated locking lever allowing the setting of water temperature in primary loop MEASURE SET B3 push button switch selecting the mode of the cooli
5. release the button SEL Remote control pad display will show one of the sub menu commands To select another command use button SEL to move in a sub menu 20 Home menu When in Home menu display shows two different strings in dependence of laser status If laser is operating dlxix viv Yim or kekki and in case laser is paused Exix Y Y m or Ex ix gt Y Y Y m Here XX amplification level YYY readings of energy meter If amplification is switched off the digits of amplification level are blinking The mark is displayed when laser is operating from internal synchronization the arrow mark shows that synchronization is external You can e start stop laser operation by pressing button OP in external triggering mode it stops laser generating only but not lamps flashing e switch amplification on off by simultaneous pressing of buttons A and V e change amplification level by buttons A and V Note In external triggering mode you can only start stop laser operation by button OP All the other functions of control pad are forbidden Single shots menu This menu provides access to control the laser generation The generation may be turned on for 1 through 99 lamps flashes thus resulting in a packet of laser pulses After a set number of shots are fired generation is turned off again and lamps proceed flashing idly In this way a fixed number of shots can be fired to the tar
6. HV connectors are loose or screws disabling HV connectors blockings are not tightened sufficiently OVERHEAT when temperature detector mounted in the power supply detects overheating of the unit This occurs if either air stream is blocked the cooling fan fails or at high ambient temperatures 35 NO CHARGE OSC at accident in the module of power supply powering the generator s flash lamp when in 2 3 s capacitor does not get charged The cause may lay in short circuit in capacitor faulty commuting thyristor or faulty charging unit NO CHARGE AMPL at accident in the module of power supply powering the amplifier s flash lamps The likely causes are as in former case OVERVOLT OSC when the maximum allowed voltage on charging capacitor of generator flash lamp is exceeded by more than 50 V Failure of voltage comparator circuit is the most probable reason OVERVOLT AMPL when the maximum allowed voltage on charging capacitor of amplifier flash lamps is exceeded by more than 50 V The likely cause is as in above case FLASHLAMPS when in 10s simmer fails to ignite in any of flash lamps powered by the unit Note When any of above listed blockings has been activated the unit operation can be restored only after the cause of blocking activation is remedied and the unit is switched off and on once again On the PS1222CO cooling unit there are several interlock status LEDs illuminating in the following cases NO FLOW wh
7. ae DANGER VISIBLE AND INVISIBLE LASER RADIATION WHEN COVER OPEN AND INTERLOCK DEFEATED Cover interlock label AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION DANGER VISIBLE AND INVISIBLE LASER RADIATION WHEN OPEN Cover hazard label AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION B Electrical warning Electrical shock label DANGER HIGH VOLTAGE DANGER DANGER VISIBLE AND INVISIBLE LASER RADIATION WHEN OPEN VISIBLE AND INVISIBLE LASER RADIATION WHEN COVER OPEN AND INTERLOCK DEFEATED AVOID EYE OR SKIN EXPOSURE TO AVOID EYE OR SKIN EXPOSURE TO DIRECT VISIBLE AND OR INVISIBLE RADIATION DIRECT OR SCATTERED RADIATION OR SCATTERED RADIATION AVOID EYE OR SKIN EXPOSURE TO DIRECT REFLECTED OR SGATTERED RADIATION Nd YAG 1064 532 355 266 nm max 600 mJ pulse 150 ps CLASS IV LASER PRODUCT AVOID EXPOSURE MEKSPLA VISIBLE AND INVISIBLE LASER RADIATION Savanoriu Ave 231 2028 Vilnius Lithuania EMITTED FROM THESE APERTURES MANUFACTURED MONTH m YEAR MODEL ___ SERIAL ___ THIS LASER PRODUCT COMPLIES WITH 21 CFR 1040 AS APPLICABLE Laser Safety Indication Warning logotype label Cover hazard label Cover interlock label Certification identification label Laser radiation emission indicator Aperture label D Interlocks O Fig 2 Illustrative positions of warning labels on SL 335 series laser head 3 LIST OF CONTROLS The follo
8. is warned that even this light may be hazardous and that he or she should maintain maximum care at all times 3 Access to laser areas should be restricted to personnel whose work requires operation of the laser These personnel must be instructed in the necessary safety procedures Warning signs placed near the laser area are recommended 4 The experiments are recommended to be set up in such a way that beams are not at eye level 5 Read and mind the specific Warning information attached to the laser system and described in chapter 2 7 below 2 3 Lamplight radiation The very design of this laser ensures that the operator is protected from flash lamp radiation Namely a The beam path is utterly shrouded within the laser cavity b The construction of the protective housing of pump chamber with flash lamps inside does not permit the user to get in direct contact with lamplight radiation However this radiation contains UV and IR components which are hazardous to eye Also laser eyewear may not filter some hazardous wavelengths 1 Caution Avoid viewing close to laser apertures It is essential to use protective goggles when handling flash lamps 2 4 Back reflection safety The back reflections from filter plates prisms et al may form additional resonator with uncontrollable radiation profiles High energy radiation focused inside the laser resonator may cause severe damage of optical elements both on surfaces and in bulk
9. nm wavelength energy is presented at Home Menu In modes 1 and 9 energy at master oscillator is measured and Home Menu looks like 4 x x v y y Here Y YY the measured energy in mJ NOTE Switch off the amplifier when measuring output energy of the master oscillator Measurement with working amplifier gives an incorrect result When in Regime menu display looks like R e g i mje x Here XX regime number The regime number is changeable by buttons A and V After switching on laser is always in default regime 0 IMPORTANT Customer is not sanctioned to operate the laser in the regimes 8 or 9 22 When Regime 2 is set access to the commands pictured below is provided 7 AXIXI Y Y a SEL together with either A or y AL XIX YIY gt SEL alone XX Number changeable by A and y Regime menu Y Y Readings of energy meter Rjelglilme 2 Amplification limit menu Makel XXI gt WRITE ME gt DONE MR Frequency divider menu F Dili XX gt WRITE FO gt DONE WR High voltage menu Ux IxIxkIv MWRUJTIEL HM DIONE WR Feedback time menu Al IXIX1X YIY sitlalb Z gt MWrliltlel At Diolnje Mrt Triggering menu SIYINIC x x x gt F 1 loJH z gt Worlilte gt Dioinje Writ Amplification limit menu As maximum laser output energy is not necessary in every particular event of operation a possibility 1s for
10. on quality of oscillator s cavity and therefore on thermal and mechanical stability of optical components If free running begins too early energy of oscillator s output optical pulse decreases and stability becomes worse If beginning of free running is late oscillator generates multi mode pulses Autocorrection of closing high voltage solves that problem Laser control unit measures duration from the beginning of free running to Q switch opening moment and adjusts high voltage to keep necessary value of that duration When single longitudinal mode has been established usually 15 20 us after beginning of the free running leak from the oscillator cavity high voltage on the electrode a is grounded Losses of the cavity are decreasing rapidly and Q switched pulse is emerging from the oscillator Oscillator contains additionally aperture 6 for the single transversal mode selection quarter wave plates 5 and 8 preventing the interference and hole burning effects in the active element Nd YAG rod Master oscillator output pulse is 3 ns duration and its energy is 4 5 mJ The pulse energy is monitored by photodiode PD1 see Fig 6 overpage and displayed on the remote control pad see chapter 6 below 5 2 Compression system Pulse compressor consists of lenses L1 L2 quarter wave retardation plate QWP1 and SBS cell with CCl liquid A linearly polarized light pulse passes through quarter wave plate QWP1 acquiring circular polari
11. to acquire the most symmetrical form 9 Switch the power supply off 10 Connect the connector HVC1 11 Switch the electrooptics off by control pad see chapter 8 1 above 12 Switch the feedback on FBC ON by control pad 13 Set the minimum voltage of the Pockels cell using FBC regulator on the laser frame rotate the knob counterclockwise and the control pad High voltage menu 14 Switch on the laser without the amplifier 15 From control pad switch the electrooptics off EO OFF 16 Start the laser operation from the control pad 17 Connect oscilloscope with laser connector FBC at the right side of laser frame 18 By increasing the lamp pumping energy obtain the oscillogram indicating the feedback is functioning Fig 12 the first diagram The At value will appear at control pad indicating the time duration between beginning and end of generation 1 10 ys 100 my H S E BR 4 922 Fig 12 Oscilloscope traces explaining Q switch operation 19 Check if the beam precisely hits the PIN photodiode Release the fixing screws and move the FBC board along the body of master oscillator PIN photodiode can also be adjusted by slight bending up or down The FBC signal amplitude should be 0 2 1 V 20 From the control pad switch the electrooptics on EO ON 40 21 A negative pulse should appear at oscillogram Fig 12 the second diagr
12. E WR Programm menu PIROGIRIAMM Mala IXIXIXI Kola XIXIXL gt Malo Xxx DONE IPRIG PIRIOG Plalr IKlolol IXIXIXI Feedback menu FIBICI JON or IFBICI JOFIFI High voltage menu Ul Ix ixiki MRI TEL HM DONE MR Feedback time menu AIFKIXIXI I sltlalbl 2 Mrliltlel lalt Dlolnlel Wi rlt Triggering menu SIYINC XXIX F 1110 Hz gt Wrliltje gt Djo nje Writ 37 Electrooptics menu From this point you can switch the electrooptical signal on off ie to turn on off the laser generation The display reads Elo 0 N when the electrooptics is switched on E O o F F when the electrooptics is switched off You can e control the electrooptics by buttons A and V e start stop laser operation by pressing button OP Delay menu From this point you can change and save permanently the delays between flashes of lamps of master oscillator and amplifier oscillator lamp s flash and electrooptical signal This menu accessed the control pad displays left fafy Pep and the delay in microseconds between oscillator and amplifier lamps flashes can be changed This enables to obtain the maximum laser output energy Before starting to search for this maximum make sure that maximum amplification level 99 is set from Home menu After button SEL is pressed the display changes to O El x x and the delay b
13. PKKEKSPLA www ekspla com Laser SL335 TECHNICAL DESCRIPTION amp USER S MANUAL Vilnius 2005 TABLE OF CONTENTS 1 STANDARD SPECIFICATION RG ANA ia 2 2 SAFETY PRECAUTON vasse 3 2 1 Safety Features and Compliance to Government Requirements 3 2 2 Lasertadiatioi EE EE EE 3 Je 4 22 Back reflection Safety aa AA cea 4 25 Electrical KUA AP 5 2 6 Guide for safe use of the laser System rsnrrnnvrrrnnvrrervrrnnvrrrnrrnverrnrsrersrrnnnsnn 5 TETT CONTROLS vrede 8 A INSTANS 11 5 LASER OPTICAL SCHEME AND PRINCIPLE OF OPERATION cccccocccocncconccnncnnnos 13 MN as lO aida lot 13 5 2 Compression iaa 14 SJ Amph fication SYSTEM arsen alen 16 5 4 Harmonics se AAA 16 5 5 External triggering ido 17 5 6 User output signals EE ET 18 NL 19 6 1 Remote Control Pad aan eee 19 6 2 Control via RLS 24 OPERACION MANUA D AA E E E R 27 Bo MAINTENANCE MANUA Dei E E E REEE 28 8 1 ME SE ia 28 8 2 Cleaning of optical componentS rrrorvrrnrrrrrnrrrrrrrrrrrrrrnnrrrrrrrrnrerrrsrrnsernnnern 28 8 3 Flash lamp rele maa NA a kaban 28 8 4 Harmonics generator optimization eiii ka 32 8 5 Primary water FN 33 8 6 Washing of cooling system AA AGA 33 9 TROUBLE SHOOTING GUIDE ad 34 IL Fuses ve 34 9 2 Error FO joe GAAN AD iii 34 10 INSTRUCTIONS FOR A SERVICEMAN ssroroosvsenronesensenssnvrensensssnsensesvsnnrensessssnsenser 36 10 1 Servicing regime from control Palau ia 36 10 2 Adjustment of master oscillator
14. YY gt MaA laser is stopped and note O v Al lyly shows up on the control pad s display If output energy of master oscillator exceeds Ma0 laser stops too Control pad shows MaO energy in mJ You can e change the coefficients MaA and KoA by buttons A and V e select a certain coefficient and log its new value into NVRAM by button SEL To log press the SEL till the note DjojnjE P R O emerges As the energy measured is that of oscillator there is no necessity to limit it To disable the protection against energy overflow set the MaA and MaO above 5000 10 2 Adjustment of master oscillator CAUTION Take special care not to damage optical surfaces 1 Take off the laser cover 2 Examine all the optical components 1 8 for cleanness and dust absence Take measures to cleanse see chapter 6 4 if soiled 3 Detach high voltage connector HVC1 on oscillator see Fig 11 Fig 11 FBC board view 39 4 Switch on the laser Regime 9 without the amplifier 5 Switch the feedback off FBC OFF by control pad 6 Switch autocorrection OFF from control pad Feedback time menu by pressing buttons A and V together 7 Start laser generation by control pad By increasing generator pumping energy at the stand achieve free generation that might be watched with the help of visualizer 8 Adjust the mirror 1 vertically and horizontally to make generation start at the lowest possible voltage and the beam spatial profile
15. am A laser pulse should also appear at generator output We might check it by vizualizer and generator energy indicator at control pad 22 By changing electrooptics delay EO DELAY achieve pulse energy maximum and prelasing time At 15 20 us 23 Increase pumping voltage of the oscillator lamp to get the oscillator pulse energy 4 mJ specified in chapter 14 If At exceeds 15 20 us increase electrooptics voltage at Control pad High voltage menu to set At within standard limits In case the high voltage tuning range is not enough to reach the necessary At adjust high voltage by the potentiometer FBC on the laser frame 24 Adjust the rear mirror of the master oscillator to maximize At and to get symmetrical beam at the oscillator output 25 Decrease the electrooptics voltage to get At 40 us Memorize this high voltage value by pressing SEL button until indication DONE WR appears 26 Get into Feedback time menu and switch autocorrection on by pressing buttons A and V together Set the feedback time 10 15 us The oscillator pulse energy should be 4 mJ specified in chapter 14 The flash lamp pumping voltage can be a bit changed to get the specified pulse energy 27 Stop the laser operation At Control pad s High voltage menu find high voltage value and tuning range by pressing buttons or V By potentiometer FBC on laser frame adjust high voltage tuning range to find the working high voltage in the middle of that range 28 O
16. and SenderName can be omitted if only a single device is controlled via RS232 with a single process program In such a case you do not need to bother about the name at all The message format is MessageBodyl E g the command to set the laser amplification level 50 will look like EO S50 In a system consisting of several devices ReceiverNanie might be omitted 1f message is assigned for all devices 25 6 2 4 Message body form message might contain one or several commands Commands are divided by space symbol General total length of a message cannot exceed 127 symbols including addresses and symbols Message exceeding 127 symbols is ignored Device does not decode an incoming message before terminator received Commands are executed in the order they are transmitted 6 2 5 Command form Two types of commands are available system command and general command 1 System command A system command is a single word composed from symbols A z and 0 9 A system command might be with a parameter or without it Parameter is separated from a command by symbol or closed within inverted commas For example NAME DI and NAME D1 are the same commands NAME with parameter DI In case symbols are used symbols V and space symbol are restricted for parameter In case symbol is used symbols are restricted for parameter and a message should contain only a single command Several commands are common f
17. answer of the same syntax E g in case the amplification level is set to 26 50 SL321 will answer EO S50 to inquiry EO Not all actions keys are valid for every sub section See device command summary 50 parameter It might be a real or integer number or a string constant String constant must begin with symbol 6 2 6 Commands summary System commands Sender Command Response Description PC VER VER string PC SN SN string PC START STARE int 1 control board 2 cover PC STOP PC SAY PC NAME PC RESET PC PACK Device Power ON General commands Array Keys Na Baa Response Description ee EO SA int 1 C4 Amplification level Home menu PO SA int 1 100 Single shots menu DO SA P int 1 100 Oscillator amplifier Delay menu delay DI SA P int 400 2000 Delay between OSC Delay menu lamp flash and EO signal D2 SA P int 3200 3200 SYNC OUT OUT delay menu FO SA P int 1 10 Repetition rate divider Frequency divider menu CO SA P int 1 1000 MaA Programme menu CI SA P int 1 1000 MaO Programme menu C2 SA P int 1 1000 KoA Programme menu C3 SA P int 1 1000 KoO Programme menu C4 SA P int 1 99 MaxE Amplification limit menu C5 SA int 1 15 E1 S int bitl Amplifier EM data transmit E2 S real bit2 Oscillator EM data transmit TO S int bit3 FBC time data tran
18. ault finding procedures require access to electrical parts in the equipment This work must only be carried out by a competent person who is familiar with normal safety procedures when dealing with high voltage and extra high voltage supplies He must also be familiar with the equipment circuitry and layout and follow the electrical schematics c A high voltage meter that reads up to 3000 V DC and 1000 V AC must be used to check that the circuitry that is to be worked is electrically dead Where appropriate the circuitry should be shorted to ground using a shorting lead 2 6 Guide for safe use of the laser system Set up controlled access areas for laser operation Limit access to the laser to personnel which presence is necessary Never look directly into the laser beam A SY Ha SS Survey the area where the laser beam traverses and block all unnecessary specular reflections and scattering Terminate the laser beam Avoid blocking the output beams or their reflections with any part of your body Operate the laser at the lowest beam intensity possible for a given application BA SI Wear safety goggles choose a model consistent with use conditions and visual function required 9 Expand the laser beam whenever possible to reduce beam intensity 10 Absorb secondary reflections with energy absorbing filters 11 Work in high ambient illumination when possible This keeps the eye s pupil constricted thus reducing the possibility of ey
19. blinking while LED BREAKDOWN remains unlit 10 Turn POWER switch in the cooling unit Push button TEMPERATURE SET and use potentiometer to set required temperature value After the button is released indicator displays the actual water temperature 12 11 Turn POWER switch in the power supply After 1 sec LEDs ERROR must die out In 4 sec simmers turn on and capacitors batteries get charged LEDs SIMMER and READY light Set specified oscillator and amplifier voltages Then press the button TRIGGERING ON for some 1 2 sec It must get lighted 12 Use control pad see chapter 6 further to operate the laser Fig 4 Rear view of power supply stand 5 LASER OPTICAL SCHEME AND PRINCIPLE OF OPERATION The laser head comprises four functional parts e Master oscillator e System of optical pulse compression e Amplification system e System of harmonics generation 5 1 Master oscillator Master oscillator is a module of rigid design mounted on invar rods to ensure mechanical and thermal stability Optical layout of master oscillator is shown in Fig 5 Oscillator s cavity is formed by a 100 reflectivity mirror 1 and an uncoated glass Fabry Perrot etalon 9 for the longitudinal mode selection Part of the electrooptical Q switch 2 between electrodes a and b is used as classical Q switch while another part between the electrodes c and b together with the polarizer 3 and PIN photodetector are forming negative feedback system
20. cles release the screws fixing the lamp pressure plates 7 Moving to and from around its axis slightly pull the lamp out of the pump chamber If the lamp does not move easily loosen the screws a bit more 8 Some water can drain from the pump chamber Wipe this water and dry the area carefully in particular around the rod pressure plate 9 Cleanse the new flash lamp with methanole or acetone At further handling hold it only at the metallic electrodes 10 Place this lamp into pump chamber Lamp endings of roughly equal length should protrude from both sides of pump chamber Attention Take special care to orient the lamp properly its anode marked with red paint must reside at the marked end of the pump chamber Remember the red painted flash lamp lead is positive and the black painted is negative 11 Tighten the screws The screws on the same side must be scrolled in turns ie one screw by some 1 2 cycles then the other that much Repeat till the screws are tightened completely 12 With care keeping rotating gently put the caps on Make sure that the caps fit finely on the lamp leads and none split is left between lamp caps and lamp pressure plates 13 Tighten the screws fixing the lamp end caps 14 Check if water does not leak over the lamp pressure plates Make sure the power supply is off Then switch the mains power to the Cabinet in whole Turn the key switch K1 Fig 3 to position ON Swi
21. d Check all optical mounts for tightness and proper placement Check all water connections to verify all quick disconnects are properly seated 3 Connect the units with the stand control unit see Fig 4 For this connect the mains cable on the power supply stand with mains inlet on the cooling unit Connect mains outlet on the stand with mains inlet on power supply 4 Connect socket INTERLOCK on the power supply with socket INTERLOCK on the cooling unit Connect sockets OSC SYNC IN AMPL SYNC IN and LASER EMISSION on the power supply with corresponding sockets on the control unit 5 Connect laser head with units For this connect high voltage cables of power flash lamps to high voltage power supply unit output connections according to the marks Connect cooling pipes to lock nut junctions LASER IN and LASER OUT according to the marks Connect terminal L on power supply with the ground wire coming from the laser head Connect the crystals heating cable HEATER to the corresponding socket on the control unit Connect cable BREAKDOWN Connect cable LASER CONTROL to the socket on control unit see Fig 4 6 Connect the control pad to its socket on the front of control unit 7 Fill cooling unit in the stand with 3 5 I of distilled water 8 Link up the lock nut junction WATER IN to the external water pipe Link up the lock nut junction WATER OFF to water pipe gutter 9 Turn key turn switch to the position POWER ON LED POWER must start
22. de SYNC EX3 laser generates optical pulse after every positive triggering pulse applied to the input CONTROL Delay between triggering pulse and optical pulse is 1 5 ms jitter 125 ns No triggering pulses can be applied to the input IN in that mode Note The laser is adjusted for 5 Hz repetition rate operation so in SYNC EX3 mode divergence of output beam is not specified if repetition rate of triggering pulses differs from 5 Hz The external triggering pulses should satisfy the following conditions IN CONTROL inputs resistance 50 Q amplitude 50 Q gt 3 5 V nominal 5V recommended IN and CONTROL pulses duration 10 us 5 6 User output signals One output sync pulse is available on the front panel of the power supply cabinet in the internal triggering mode OUT BNC type socket provides sync pulse linked with the Q switch timing and delay controllable from the remote control pad Pulse parameters are as follows amplitude AV 9500 rise time 50 ns duration 120 us jitter in respect to optical pulse 0 5 ns The delay between the Q switching moment t in Fig 7 and OUT sync pulse can be adjusted in a range 8 ms laser operating in internal triggering and external SYNC EX2 modes and from 8 to 1 ms operating in external triggering modes SYNC EX1 SYNC EX3 see chapter 10 1 Delay menu OUT delay menu accessed you see IDILI X X X X X Here XXXX the delay in the units of 125 n
23. e damage 6 12 Place the external optical components with a flat or negative curved surface looking toward the laser so that reflections are not focused back or are directed into an energy trap 13 Double check that the laser beam is not generated in fact when you anticipate that it is off Use a positive check method such as an IR card or energy detector 14 Follow the instructions in this Manual 15 Unplug the laser power cord and short internal components when working on the power supply 16 Attempt electrical service only if you are experienced in high voltage current circuits and understand the circuitry and related hazards 17 Be especially careful when working with 1 06 um radiation Although you cannot see it this radiation will pass around the corner and focus on the retina 18 Never gaze directly into naked adapter at laser in operation 19 Never gaze directly into the edge of optical fiber cable connected to adapter when laser runs 2 7 Labeling The further listed are the labels attached to the equipment The further listed are the labels attached to the equipment A Laser radiation warnings VISIBLE AND OR INVISIBLE RADIATION AVOID EYE OR SKIN EXPOSURE TO DIRECT Laser hazard label REFLECTED OR SCATTERED RADIATION Nd YAG 1064 532 355 266 nm max 600 mJ pulse 0 15 2 0 ns CLASS IV LASER PRODUCT AVOID EXPOSURE VISIBLE AND INVISIBLE LASER RADIATION Aperture label EMITTED FROM THIS APERTURE Da
24. e have a responsive Customer Service staff that will be pleased to help you with any product difficulties Please do not hesitate to contact them at Altos Inc Phone 1 949 939 6292 Fax 1 909 363 8637 E mail sales altos inc com www altos inc com 43
25. en detector in the primary water circuit detects absence of water flow This occurs when the pump is not switched on or at its failure or if coolant is completely lost or the cooling pipes are wrongly connected or blocked clutched Also this blocking may be activated at the first cooling unit s switching on after the primary water has been replaced The air remaining in the system is the cause Switch the cooling unit off switch on again and press button MEASURE SET B3 until all the air is out OVERHEAT when temperature sensor in the primary water circuit detects overheating The instance of overheating is identified when temperature in primary circuit grows up by 5 C above the value set by potentiometer P3 see chapter 3 of this manual PURITY LOW indicates that the conductivity of water in reservoir has increased 36 10 INSTRUCTIONS FOR A SERVICEMAN 10 1 Servicing regime from control pad When the laser control pad regime is set to 8 from Regime menu expanded menu becomes available Home menu 7 1 N xxi YIYIYim i SEL together with either A or y XIX Y Y Ylm xx dv gt SEL alone t XX Number changeable by A and y Paa a YY Readings of energy meter APORTO Lif nin Z Regime menu Rlelglilme 8 or Rlelglimel lol Electrooptics menu Elo JOIN or EJO JOFIF Delay menu Dle aly XIX QI E XX DL XlxIxIxIx WRU TIE DL i I DION
26. eseen to limit 1t up to a certain level Amplification limit menu accessed display looks like Mia x E X x Here XX maximum amplification level you have chosen e the topmost number to which you will be allowed to rise amplification level when in Home menu You can e change maximum amplification level in the range of 1 99 by buttons A and V e log the chosen amplification limit into NVRAM to retain it after laser power is switched off by button SEL to log SEL must be pressed twice e start stop laser operation by pressing button OP 23 Frequency divider menu Laser pulse repetition rate of 5 Hz is not always necessary 1t may be reduced 2 to 10 times while the frequency of pump lamps flashes remains unchanged 5 Hz Frequency divider menu accessed display looks like El lily xix Here XX division factor number from 1 to 10 Eg XX 1 gives 5 Hz pulse repetition rate XX 5 does 1 Hz You can e change pulse repetition rate by buttons A and V e log the chosen division factor into NVRAM to retain it after laser power 1s switched off by button SEL to log SEL must be pressed twice Feedback time menu Feedback time menu is the following AEBBBT DI gt TtJa b TT 12 gt Weile Tali gt Polle Wft Here XX is the measured streatching time YY is the desired value of feedback action time or in case autocorrection is OFF Z is stabilisation parameter inertness of autoad
27. etween devices and PC is message based Every device can send messages at any time There is no handshake Therefore devices as well as PC have buffers to keep raw unprocessed messages Transfer is considered to be performed without mistakes therefore no data confirmation and mistake control messages are necessary 6 2 2 Names As RS232 port allows controlling several devices simultaneously e g laser data unit parametric generator each device owns a unique name composed of two or three symbols A z and 0 9 The name is used as address when sending commands To answer a message sender must also have a name The name of a sender is composed of two or three symbols too A name of the laser is SL An additional name is reserved for the main control program MS At this address data from energy meters mistake messages etc are sent 6 2 3 General message form Every message starts with symbol and ends with In a system consisting of several devices a message might be inserted into another one For example PC can receive a message Com Command mand There are two uniform messages Command Receiving device does not repeat the received symbols Therefore in case any terminal program Hyperterminal is used for manual operation you should switch on the option echo typed characters locally to view symbols General format of a message is ReceiverName MessageBody SenderNaime Both ReceiverName
28. etween oscillator lamp s flash and electrooptical signal can be changed Here XX delay value in units of 125 ns ie the actual delay in nanoseconds is obtained by multiplying XX by 125 ns The delay between the Q switching moment t in Fig 7 and OUT sync pulse can be adjusted in a range 8 ms laser operating in internal triggering and external SYNC EX2 modes and from 8 to 1 ms operating in external triggering modes SYNC EX 1 SYNC EX3 You see DIL x X x X X Here XXXX the delay in the units of 125 ns sign appears when OUT sync pulse precedes the electrooptics opening To log the modified delay values into NVRAM press the button SEL two more times until the following note is displayed DIO NIE WIR You can e change the delays by buttons A and V e log the newly set delay values into NVRAM by button SEL e start stop laser operation by pressing button OP 38 Programme menu The laser control unit has an analog input linked to the photodetector A part of master oscillator s output radiation gets into this photodiode and thus the energy can be observed When in this menu the display reads P RJOJG R A MM From this point you can change the coefficients that are used to calculate the energy values returned onto control pad s display in Home and Single shots menu The YY value is proportional to coefficient set from Programme menu KoA At the occurrence
29. f in order to protect harmonic crystal against the atmospheric humidity Heater is equipped with LED indicator which commence fading and illuminating in a periodical manner when crystal temperature has reached the set value The fundamental and harmonics pulses are separated by dichroic mirrors 5 5 External triggering The laser can be triggered by external synchropulses There are three modes of external triggering One of three modes can be chosen from remote control pad s Triggering menu see chapter 6 1 CONTROL In mode SYNC EX triggering pulses must be applied to the sockets CONTROL and IN Fig 7 The pulse CONTROL initiates oscillator s and t amplifier s pump lamps flashes and high voltage pulse applying to the Q switch crystal Synchropulse applied to the input IN controls electrooptics At the time moment t high voltage pulse is terminated and Q switched pulse is generated In mode SYNC EX2 output sync pulse from Electrooptics the outputs OUT see chapter 5 6 can start your experiment and after some definite time triggering pulse from the external generator supplied to the input IN starts a laser pulse generation The delay between OUT sync pulse and the Q switching moment t in Fig 7 in control pad s Delay menu see chapter 10 1 must be set negative and equal to the pulse delay in external circuits between output OUT and input IN Optical pulse 50 100ns Fig 7 SL335 timing charts In mo
30. g system In case you find the cooling unit infected with organic substance kind of algae the whole cooling system needs to be washed over You will need e 0 5 liter of 30 hydrogen peroxide or 0 5 1 litre of cleaning liquid Extran MA 03 phosphate free of Merck make e 3 5 liter of distilled water e a spare particle filter e aspare DI filter Turn the laser system off Drain the water from cooling unit Fill the reservoir with distilled water adding the hydrogen peroxide or Extran Switch the cooling unit on In dependence of the cleaning agent being used leave the unit working for an hour in case of hydrogen peroxide and for some 3 5 min in case of Extran Switch the unit off and drain its reservoir Replace the DI and particle filters with new Refill the reservoir with distilled water Switch the cooling unit on and make sure it works normally A QD sm oO EI RA Note The temperature of cooling water in the cooling unit is pre defined at 29 C If the environmental temperature of your working place exceeds mentioned 29 C the laser heads may start covering with dew Therefore the cooling water temperature needs to be The maximum admissible temperature of cooling water is 32 C 34 9 TROUBLE SHOOTING GUIDE 9 1 Fuses schedule Fuse quantity Fuse type Function Rear of stand control unit 1 2A For protection of all units in stand 3 16A against current and short circuit damage Rear of powe
31. get When in Single shots menu display looks like Pik X x Here XX number of pulses in a packet In the course of generation of pulses packet the view of display is that below L f n n Here nn number of pulses remaining You can e change size of pulses packet by buttons A and V e give start for pulses packet by button SEL e start stop laser operation by pressing button OP 21 NOTES 1 Pressing of button SEL does not start stop the laser flashing it only affects the optical pulses generation Therefore pressing of SEL will not force the laser out of the temporal halting 2 If at laser paused press buttons SEL and OP in a sequence after 70 idle flashes a packet of pulses will be fired and then the laser resumes flashing without generation 3 If press SEL while laser is in the process of generating pulses generation will be turned off after fixed packet of pulses has been generated Regime menu There are five regimes available e Regime 0 is allotted for routine maintenance e Regime I amp 2 allows changing programming of laser pulse repetition rate and maximal amplification level e Regimes 8 amp 9 are for laser servicing only The latter laser servicing regime features expanded main menu see chapter 8 1 and allows operating the laser with covers open Regimes 0 2 amp I as well as 8 amp 9 differ only by indications of energy meters In regimeses 0 2 and 8 a measured 1064
32. he other that much Repeat till the screws are tightened completely 14 Check 1f water does not leak over the lamp pressure plates Make sure the power supply is off Then switch the mains power to the Cabinet in whole Turn the key switch K1 Fig 3 to position ON Switch on the cooling unit 15 Watch if any trails of water appear around the lamp ends 16 In case a leakage is detected switch off the cooling unit and the whole system Isolate the system from mains Following the procedure above take off the lamp pressure plate at the leaking side of lamp chamber Check if the O ring is seated properly Take the O ring out and inspect for cracks Unless any defects put the O ring back Place and fix lamp pressure plate and lamp cap Wipe the drained water out 17 1f water does not leak put the pump chamber into its place The directing pins on the desk must fit into pits in the sole of pump chamber Tighten the fixing plate by crews 2 and then tighten 1 None extra adjustments of the chamber are needed 8 4 Harmonics generator optimization While adjusting the harmonics crystals make sure that reflections from the crystals are directed away from the amplification system Reflections into the amplification system can provoke free running generation within the system The harmonics crystals must be inserted and removed from the laser only when laser operation is cancelled Optimize the phase matching angle to achieve maximum SH pu
33. irror M11 Keeping visualizer close to aperture A2 observe the depolarized beam which profile is a ring shape Adjusting mirror M11 direct the depolarized beam so that it was symmetrically rejected by aperture A2 the depolarized beam ring center should coincide with the aperture center Cautiously rotating the QWP2 plate obtain depolarized beam of minimal energy Put the telescope lens L3 in Adjust it to make the beam pass through the lens center and the amplified beam after polarizer P2 to have a symmetrical profile 10 5 Replacement of Nd YAG rods In case active Nd YAG crystal of either oscillator or amplifier gets broken through or damaged in any other way it needs to be replaced For this perform the following steps 1 Nn Release cooling water pipes unlocking lock nuts 2 Unscrew fixing screws of plastic power cables caps and unlock power cables 3 4 Release the YAG Nd rod pressure plates by unscrewing fasteners some 2 3 rotations Take the flash lamp cavity out of the laser head and remove the rod Place the new rod carefully into its location 6 Assemble the cavity in a reverse order 7 Install flash lamp cavity precisely back into its initial place After the rod is replaced check the output beam profile at medium power If considerable alteration is observed readjustment of the relevant part of laser optical scheme is needed See chapters 8 2 and 8 4 for adjustment procedures of master o
34. justment 2 9 or in case autocorrection is OFF To switch autocorrection ON OFF press buttons A and V together YY and Z changeable by A and V at the corresponding submenu After pressing SEL at submenu W r i tje Alt parameters YY and Z are saved in NVRAM Feedback action time is stabilised by adjusting high voltage at high voltage menu DAC controller allows to change voltage within a narrow diapazone therefore at the edge of DAC values diapazone the following indication is displayed LO PUMP or HI PUMP which indicate the voltage is too low or too high DAC bias requires correction potentiometer at laser frame In case the lowest DAC value is achieved indication LO PUMP displayed laser shooting is stopped Triggering menu In this menu external or internal synchronization mode can be chosen Having entered this menu control pad indicates SYNC INT if the laser is operated from internal generator Indications SYNC EX1 SYNC EX2 and SYNC EX3 mean three different modes of external triggering see chapter 5 5 External triggering The mode might be chosen by buttons A and A Synchronization mode is saved by pressing SEL button until indication Done Wr appears 24 Note In external triggering mode you can only start stop laser operation by button OP All the other functions of control pad are forbidden 6 2 Control via RS232 6 2 1 General information Communication b
35. lified in Nd YAG rod R1 The beam polarization is rotated by 90 during two passes through the quarter wave plate QWP2 On the return pass the amplified pulses with rotated polarization pass the P2 and are directed by mirrors M4 M7 to the second double pass amplifier R2 Amplified laser pulses pass the spatial filter consisting of lenses L5 L6 and pinhole in the vacuum cell VC and get into the harmonic generation part 5 4 Harmonics generation The Nd YAG laser fundamental wavelength can be frequency doubled tripled and quadrupled inserting into the beam pass the nonlinear crystals generating corresponding harmonics The wavelengths available are as follows 1064 nm Fundamental Infra red 532 nm 2nd Harmonic Green The second harmonic SH is generated in nonlinear crystal The SH radiation propagates together with the fundamental beam The harmonic conversion efficiency should be optimized tuning the harmonic crystal for the phase matching where the refractive indices of the fundamental and harmonic wavelength are equal so called momentum conservation rule The SHG crystal holder is equipped by the tuning knobs for phase matching adjustment Phase matching angle is also dependent upon the crystal temperature The SHG crystal is mounted in temperature controlled heater and kept at the stable temperature The heater should be turned on at all times even when the system is in a stand by mode power key switch K1 on the Cabinet is of
36. lse energy by adjusting the SHG crystal in the horizontal plane Only tune the SH crystal in the horizontal plane the SHG crystal is configured at the factory to prevent reflected radiation from getting into the amplifier aperture 33 8 5 Primary water replacement Note Here is a brief description consult the Manual of cooling unit PS1222C0 for details 1 Pulling forwards withdraw the cooling unit from Cabinet and remove the reservoir cork By either siphon or stirrup pump type device drain the water from primary cooling contour into a suitable vessel Refill the reservoir with distilled water 3 5 liters 2 Inspect if the filter is not clogged Replace it if necessary 3 It is essential that none air be left in the primary circuit after the reservoir refill To remove the air turn the key K1 and power S3 switches to ON Fig 3 Press button MEASURE SET B3 disabling all the blockings in the cooling unit This should cause all air in cooling contour to be pumped off into the reservoir In the case this did not help to remove air from pump switch off power switch S3 turn by several rounds the filter sump to let the air out of the internal contour Turn the filter sump tightly again When all the air is likely to have been removed release the B3 and check primary water level Switch off the cooling unit S3 to OFF Stuff the reservoir cork back and slide the unit into its place in the Cabinet 8 6 Washing of coolin
37. ng unit LED display When depressed SET mode display reads the preset by the P3 primary water temperature Usual mode of this switch is MEASURE released and in this mode cooling unit LED is indicating the actual temperature of the cooling water in primary loop On the Laser Head FBC photodetector output connector LEMO type for oscillator operation monitoring during maintenance and potentiometer for FBC high voltage adjustment 4 INSTALLATION Laser and auxiliary units must be settled in such a place where exploitation conforms to the regulations enlisted in p 2 1 of present manual and comply with below conditions temperature within 15 25 C humidity below 85 water lt 20 C at least 8 l min pressure 1 8 bars mains 208 V AC 10 50 60 Hz single phase IMPORTANT Be aware that this laser is a complex product requiring a certain personnel experience to conform service precisely So we would highly recommend calling for EKSPLA assistance at laser installation or assistance of authorised serviceman The instructions bellow are useful for personnel familiar with laser SL335 1 Unpack and inspect exterior injuries caused by transportation If such are present inform EKSPLA and the agency that carried out transportation 2 Fix laser head to optical table Place the power supply stand near laser head Fix the plastic pipe from laser head to the stand Remove covers from laser head and the rear cover from stan
38. nts The applicable United States Government requirements are contained in 21 CFR chapter 1 subchapter J administered by the Center for Devices and Radiological Health CDRH The European Community requirements for product safety are specified in the Low Voltage Directive LVD published in73 23 EEC and amended in 93 68 EEC The Low Voltage Directive requires that lasers comply with the EN 60825 1 Radiation Safety of Laser Products and IEC 1010 1 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use The laser head is enclosured in a protective housing that prevents human access to radiation in excess of the limits of Class I radiation as specified in 21 CFR subchapter J Section 1040 10 f 1 and Table 1 A EN60825 1 clause 4 2 except for the output beam which is Class IV The appropriately labelled light on the laser head illuminate before laser emission can occur Amber light is used so that it will be seen when the proper type of safety glasses are used 21 CFR subchapter J Section 1040 10 f 5 EN60825 1 clause 4 6 A beam shutter prevents contact with laser radiation without the need to switch off the laser 21 CFR subchapter J Section 1040 10 f 6 EN60825 1 clause 4 7 The laser controls are positioned so that the operator is not exposed to laser emission while manipulating the controls 21 CFR subchapter J Section 1040 10 f 7 EN60825 1 clause 4 8 2 2 Laser radiati
39. on 1 The laser radiation emitted by this laser may be of different wavelengths as follows Fundamental radiation 1064 nm Infra red completely invisible Second harmonic 532 nm Visible visible Third harmonic 355 nm Ultra violet completely invisible The wavelength emitted by a particular laser system is specified on the warning logo All reflections whether specular or diffuse from optical components such as steering mirrors and prisms are dangerous The eye will transmit most of the laser radiation directly to the retina which can be severely damaged If you are in doubt about the distribution of laser radiation within external optical system relevant detecting equipment should be used Damage to other parts of the body will be a function of the laser power level and exposure time Attention Laser goggles glasses of the approved type must be worn by all personnel at all times during operation of the system This protective eyewear must be effective at the wavelengths that can be generated 1 Care must be taken when using focusing optics external to the laser system Mirrors or lenses can reflect the beam back into the laser system Such returned power can damage optical surfaces or components He Ne laser mounted collinear to the optical axis can serve as a convenient check on possible reflecting surfaces 2 The radiation classed as completely invisible may interact with any surface on which it impinges to produce visible light The user
40. or all devices SAY the most harmless command It does nothing An answer is READY or BUSY The command is used to check what devices are on line A device sends message BUSY when some operations are being executed e g start up operation RESET forces a device to repeat start up procedures Having finished them the device sends READY In this case READY means the device is ready to receive commands but not the absence of problems In a case of mistake additional messages might be sent between RESET and READY These messages are described in the commands summary PowerON device sends after connection to mains READY device sends in case it is ready to execute commands 2 General command General commands are used to control device sub sections Device sub section is a one dimension array of numbers or string constants Elements of array might be read written increased or decreased To explain syntax the following example is given a command to set laser amplification level 50 EO S50 Here E the array name 1t might be a single letter A z 0 index this is a word type number 0 65535 separator S action key Might be the following S A P The key S SET writes the parameter The key A ADD increases or decreases the parameter The key P PROGRAM makes the parameter NONVOLATILE Used in devices where constants are saved in EEPROM Symbol indicates the inquiry The device replies to this inquiry by the
41. perate the laser with the amplifier switched off and measure pulses energy stability at the laser output If laser pulses are not stabile enough you can try to vary cooling water temperature Feedback time At can also be adjusted in a range of few microseconds for energy stability improving 10 3 Adjustment of SBS compressor Shield SBS cell s front window 2 Direct the beam from master oscillator through the central parts of focusing lens LI and QWP1 plate Fig 6 3 Turning horizontally the plate which holds polarizer P1 use visualizer to view side reflected radiation and minimize the reflection energy Turning vertically make the reflected beam parallel to the basement surface Do not attempt to adjust QWP 1 plate 41 10 4 Adjustment of amplification system Take the lens L3 out and shield the mirror M11 Switch the generator on and the amplifier power supply off By mirrors M9 and M10 direct the beam through the center of power amplifier active crystal Rotating the handle AMPLIFIER VOLTAGE on the front panel of power supply set low amplification level and switch the amplifier on Check the polarizer P2 for its proper orientation For this put a A 2 retardation plate in between polarizer P2 and mirror M10 Use infrared sensor to set the polarizer angle to optimal i e at which the amplifier input energy reaches minimum Achieving this withdraw A 2 plate and repeat the current point instructions once again Uncover m
42. r supply 2 16A Protection of the power supply against current overload and short circuit damage 9 2 Error conditions The laser stops e In case the laser control pad indicates DOOR the cover should be checked e Incase of indication Y vo Ix x x generator energy is exceeded the programmed value see chapter 8 To continue the work press button SEL Incaseof O V A X X X m amplifier energy has exceeded the programmed value see chapter 10 To continue the work press button SEL e Incaseof CB t lo lu t the main processor does not receive an answer from controller at laser frame This might happen due to wrong connection of laser signal buss with the stand or due controller operation disturbance caused by strong electrical noise To continue the work you should switch off the laser by turning the key and switch on the laser again e In case the laser control pad indicates LOW PUMP the master oscillator should be checked see chapter 10 2 On the Cabinet there is one interlock status LED which illuminates when BREAK DOWN circuit gets open On the PS5012E flash lamp power supply there are several interlock status LEDs illuminating in the following cases INTERLOCK at accident in cooling unit or when connection is absent between sockets INTERLOCK on power supply and cooling unit see Fig 3 or cooling unit is off HV CONNECTORS when high voltage wires are not attached or
43. s sign appears when OUT sync pulse precedes the Q switching moment moment t2 in Fig 7 You can change the delay by buttons A or V To log the modified delay value into NVRAM press the button SEL two times Remote control pad display will read DONE The signal of negative feedback FBC is accessible from connector FBC at the right side of laser frame see the chapter 10 2 Adjustment of master oscillator for details 6 CONTROL 6 1 Remote Control Pad The control pad provides access to perform the following functions v 4 e START STOP optical pulsing se e Set the AMPLIFICATION level e Set the optical pulses REPETITION RATE o CP4 e Set the SINGLE SHOTS mode EJEKSPLA e Check output energy Fig 8 Remote control pad Description of commands The main top part of Menu tree is depicted further ME XX z YYY m SEL together with either A or y E BAXZ BAM M XX Number changeable by A and v Y Y Y Readings of energy meter in mJ Single shots menu haa Pa eees 3 z Triggering mode internal Pik XX gt external CIL nn gt AE NN al Regime menu RegilmelXXx To select main menu commands this corresponds to a vertical movement in scheme shown on Fig 8 press button SEL and hold it down while selecting the desired command by buttons A and V When selected
44. s to necessary position The lens with marked appropriate duration should be moved to the beam path in front of SBS cell input e Close the cover Run the laser by pressing button OP on the remote control pad 28 8 MAINTENANCE MANUAL To perform laser maintenance procedures the following devices and materials are required e Oscilloscope with bandwith 100 MHz or more e 50 Q terminal e Lens cleaning tissue e Pure ethanol for the cleaning of optical components e Visualizer or IR wiever e Power meter 8 1 Maintenance schedule Weekly Monthly e inspect cleanness of all the optical components surfaces e check for any water leaks external to the Cabinet e check all external hose connections for damage or loosening Every three months e all the above e change the primary water Every six months e all the above e inspect flash lamps and replace them if necessary Every year e all the above e replace the deionizer and particle filter cartridges 8 2 Cleaning of optical components 1 Inspect the surface of optical components carefully Dust particles sticking or build up of films on optical surfaces may cause costly damage of optical components 2 Contaminated optical surfaces may be cleaned by air brush Be sure that your air brush is clean 3 If dust or other contaminants are not removed when using air brush use lens cleaning tissue moistened with pure alcohol eg ethanol methanol et al Purit
45. scillator and amplification system correspondingly 11 COMPONENTS LE 2 Power supply Landene kap 2 1 Power supply P55012E X anan a AG 2 2 Cooling unit PS1222C0 aaa 3 Power supply cable caia aiii NE A NE A 5 Coaxial 50 Q cables BNC BNC asana nika aaa 12 SPARE PARTS AND ACCESSORIES a OA EEE 2s Fuses 2 0 A AA EE LATE hex Kake anren neat 4 Coaxial 50 Q cable LEMO BNC Japan k De Binding chips FT dni 6 Binding bolts 433 07 02 incida 13 WARRANTY STATEMENT EKSPLA warrants to the original purchaser that laser devices are free from defects in parts and workmanship EKSPLA will make any necessary repairs or replacement of parts to remedy any defect according to the conditions drawn up in the contract The foregoing warranty does not cover equipment that is damaged by accident or improper use EKSPLA does not assume any liability if adaptations are made or accessories attached to the equipment that impair or alter the normal functioning of the equipment The limited warranty and remedy contained in this paragraph are the only warranty and remedy pertaining to the equipment EKSPLA DISCLAIMS ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE EKSPLA is not liable for any accidental consequential or other damages or costs lost profits or inconvenience occasioned by loss of the use of the equipment or labor expended by persons not so authorized by EKSPLA W
46. smit UO S int bit4 FBC control DAC data transmit C6 S int 0 1 EO ON OFF Electrooptics menu C7 S int 0 1 Amplification ON OFF Description int integer er 7 OPERATION MANUAL 1 Turning laser on Turn key switch on power supply cabinet to the position POWER ON Wait until LEDs READY on the lamp power supply light and depress the button TRIGGERING ON for 1 2 sec e Open external cooling water supply line Allow the laser to warm up Laser will be operating in a stable way when water temperature in the primary loop will reach preset value Laser is ready for operation e Use remote control pad to operate the laser Refer to Chapter 6 for commands 2 Turning laser off Turn key switch to the position POWER OFF LED POWER will be blinking indicating that laser is in stand by mode and there is power supplied to the harmonic heaters 3 Temporal halting of laser operation If you plan to revert to operate the laser after a short pause up to say some half an hour it is recommended to stop the laser by pressing button OP on the remote control pad thus leaving power on In this case the laser thermal conditions will be retained and after a pause laser will return quickly to the same operation mode as it was before stopping 4 Changing a pulse duration Stop the laser by pressing button OP on the remote control pad Open the laser head cover Turn the disc with lense
47. tch on the cooling unit 15 Watch 1f any trails of water appear around the lamp ends 16 In case a leakage is detected switch off the cooling unit and the whole system Isolate the system from mains Following the procedure above take off the lamp cap and lamp pressure plate at the leaking side of lamp chamber Check if the O ring is 31 seated properly Take the O ring out and inspect for cracks Unless any defects put the O ring back Place and fix lamp pressure plate and lamp cap Wipe the drained water out 17 1f water does not leak the power supply can be switched on 18 If other optical components hinder to freely remove lamp caps and withdraw the lamp release two screws 8 and take out the plate holding the pump chamber Lift the whole chamber as far as the cables and hoses allow 19 Replace the lamp lamps 20 Put the pump chamber onto its holder The directing pins on the desk must fit into pits in the sole of pump chamber Tighten the plate None extra adjustments of the chamber are needed Oscillator flash lamp replacement 1 Make sure the laser system is switched off and isolated from mains supply 2 Allow at least two minutes to elapse since the flash lamps were powered the last time 3 Remove the main laser head cover and one side cover to ease access to the oscillator s chamber 4 Release the screw 1 unscrew 2 and remove the fixing plate see Fig 10 Fig 10 Pump chamber of master oscilla
48. tor 5 Release screws 3 and disconnect flexible lamp electrodes 4 from connectors 6 Carefully lift the chamber from it s place and turn it aside to prevent water drops falling onto optical components when removing flash lamp It s recommended to close optical components by plastic film to protect them from water Caution Always wear safety goggles to protect the eyes from flying debris should the flash lamp explode whilst handling 7 By 3 4 full cycles release the screws 5 fixing the lamp pressure plates from both sides of pump chamber 32 8 Moving to and from around its axis slightly pull the lamp out of the pump chamber in the direction of the positive electrode If the lamp does not move easily loosen the screws 5 a bit more 9 Some water can drain from the pump chamber Wipe this water and dry the area carefully in particular around the rod pressure plate 10 Cleanse the new flash lamp with methanole or acetone At further handling hold it only at the metallic electrodes 11 Remove isolator 6 from the old flash lamp and put it on the new lamp s electrode 12 Place this lamp into pump chamber The isolator 6 should lean against the lamp pressure plate Attention Take special care to orient the lamp properly its anode red must reside at the marked end of the pump chamber 13 Tighten the screws 5 The screws on the same side must be scrolled in turns ie one screw by some 1 2 cycles then t
49. wing controls are located on the front panel of the power supply cabinet see Fig 3 to Control Pad CONTROL PAD ONTROL mE 6 6 6 BEKSPLA POWER SUPPLY EKSPLA COOLING UNIT Fig 3 Front view of power supply Cabinet 9 e KEYSWITCH K1 turning the key is switching laser from standby mode to operation mode In operation mode power is supplied to the flash lamp power supply cooling unit and microcontroller Note In stand by mode POWER indicator is blinking and the keyswitch is off indicating that power supply of harmonic temperature controllers in which the harmonics crystals are placed remains turned on meanwhile the system remains isolated from the mains This ensures the maintenance harmonics crystals at a stable elevated temperature and prevents them from the damage from the moisture e CIRCUIT BREAKER M5 an emergency switch to shut down the whole system Depressing this mushroom head button cancels mains powering to power supplies and cooling unit To revert to the normal laser operation after an emergency exit turn the keyswitch K1 to position OFF and then to ON again e CONTROL external trigger input connector BNC type controlling flash lamp operation e IN external triggering input connector BNC type controlling Q switch operation e REMOTE remote control pad s connector e RS232 optional RS232 interface for computer control On the PS5012E power supply e TRIGGERING ON B1
50. y of solvent must be checked beforehand put a drop of alcohol on a glass plate and after solvent evaporates none marks must be left on the glass surface CAUTION The all harmonic crystals are highly hygroscopic and must be cleansed exceptionally with squirrel tail brush or dust may be blown out by air stream When this does not help use water free pure butylacetat 8 3 Flash lamp replacement 29 Amplifier flash lamp replacement Layout of SL335 laser amplifier pump chamber is shown in Fig 9 1 3 8 12 fasteners 2 lamp end cap 4 lamp pressure plate 5 flash lamp 6 11 O rings silicone 7 pressure washer 9 plate 10 rod pressure plate 13 rod Fig 9 Layout of laser pump chamber Warning Failure to follow this procedure precisely can lead to injury and severe equipment damage 30 1 Make sure the laser system is switched off and isolated from mains supply 2 Allow at least two minutes to elapse since the flash lamps were powered the last time 3 Remove the main laser head cover Caution Always wear safety goggles to protect the eyes from flying debris should the flash lamp explode whilst handling 4 From both sides of pump chamber release the screws fixing the lamp end caps see Fig 9 5 Carefully slightly rotating to and fro around the lamp axis take the caps Q off Note Do not make any bending movements nor apply strength otherwise the lamp can break 6 By 3 4 full cy
51. zation and is focused into double pass SBS cell Duration of the compressed pulse can be changed by selecting one lens with proper focal length from lenses L2 Focusing is arranged in the way to compress the Stokes pulse via backward stimulated Brillouin scattering SBS process The backscattered Stokes pulse as its phase is reversed strictly repeats the path of the incoming pulse in the opposite direction and with a reversal divergence The compressed pulse passes the retardation plate QWP1 that transforms polarization of Stokes radiation into linear and perpendicular to the polarization of incoming radiation 15 WU 7901 wu ZEG awayas peondo Jase CECTS 9 314 UN i F ak IP Sas E all ra E pawa E NG Sa j I H YOLVTIOSO YALSYIW MON EE EE 104 Ne at BORER EERE RRR RRR Ree RRR AAA LAIA EEE LLL A a a Ja a a a PAA AA EE Pee LL E FW aA PT a AU E OF zd Y en oo o E EM HV Toy Yoo Ni i EH A V AMH 71d Falo ATEN N da an 3 NE ESS OTAN oe an ETIN DHS TIN TA EdMO EAT iii tt A HE V o FrEx FOR V OW OIN Hi a aasa MA Prva resserernsereressereenseeen DA D 5 3 Amplification system Power amplifier is based on two laser chambers containing Nd YAG rods pumped by flash lamps and include optical components arranging two passes through the active elements and their holders Laser pulses from the master oscillator are reflected by the polarizer P2 and are amp
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