Tsunami - Beckman Institute Laser Resource Center

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Tsunami Symptom: Unable to mode lock during broad pulse ps operation Possible Causes Corrective Action Same as those listed under "Unable to mode lock under specific ps wavelengths." Matching network not installed. In addition to the item referenced, note that the broader the pulse, the more sensitive the system is to any environmental change. For this reason, it is even more important that the Tsunami mode be optimized. Install the special matching network assembly in series with the AOM for systems with pulse width capability over 10 ps. Symptom: Long-term Stability is Poor Possible Causes Corrective Action Avoid temperature swings 1 * 3°C; avoid turbulent airflow over the entire sys- Environmental problem tem. Do not allow the cooling water to change temperature drastically or to cycle. Improper alignment of the routing mirror assemblies. A mirror in the routing mirror assembly is not properly seated. A tube in the routing mirror assembly is not properly installed. A mirror in the Tsunami is not properly seated. Loose mechanics. Poor beam mode profile. Electronics phase shift. Unstable ion laser. Faulty chiller system. Or Check the alignment of the routing mirror assemblies between the pump laser and the Tsunami laser. The dust tubes may be binding against the mirrors. Optimize Tsunami laser output, then tap the back side of each routing mirror holder while watching the output power level. If the power falls, you have a seating problem with that mirror. Each tube should slide freely inside the mirrors, over the laser snout or input window, and with respect to each other. All tubes should be at the same height and parallel with the table, and the beam should be centered in the tubes. Refer to chapter 5, "Installation: Set up the Routing Mirrors." Optimize Tsunami laser output then, one at a time, tap the back side of each mirror holder while watching the output power level. If the power falls, you have a seating problem with that mirror. Reseat the mirror, then optimize the laser output by adjusting that mirror before proceeding on to the next mirror. Optimize Tsunami laser output, then systematically verify all the mechanics are secured. Start with the ion laser locknuts on the feet, then proceed to the lock-down clamps, and the routing mirror assemblies. Next, check the internal Tsunami mechanics, then its locknuts and, finally, its foot clamps. With the beam directed to far field (e.g., displayed on a wall), adjust Mp to obtain a solid, slightly elliptical mode with high contrast. There should be no spikes on the outer edges of the beam profile. The cover of the Model 3955 must be in place. Otherwise, you can get unstable operation. Do the following (refer to the ion laser user's manual for details): 1. Clean and inspect the windows and the mirrors. 2. Clean and inspect the light pick-off beam splitter and the BeamLok beam splitter. 3. Peak the ion laser. 4. Check ion laser mode. 5. Tw another a~erture settina. 1. Verify the Tisapphire rod housing is cool (about 18°C or 64°F). 2. Verify the water level in the chiller is adequate. Refer to its user's manual. 3. Faultv chiller. Refer to its user's manual for troubleshootina.
Service and Repair Symptom: Laser is mode locked but has noisy >2 ps pulses with side lobes or baseline noise (ps configuration only) Possible Causes Poor cavity mode. Contact your Spectra-Physics Lasers field service representative. Do not at- GT' might be misaligned' tempt disassembly You will void your warranty. Pump power is too high. Possible oxygen or moisture contamination from the purge Corrective Action Verify M2 and M3 are properly aligned. Refer to chapter 6, "Alignment: Cavity Alignment." Reduce pump power until the side lobes or the baseline noise disappears. Use only dry, oil-free, Electronic Grade 5 nitrogen gas from a cylinder. Avoid boil-off tanks which might contain oxygen or water vapor. Check the color of the desiccants in the molecular-sieve assembly in the Model 391 0 and make sure they are not pink. If they are, replace the assembly (refer to chapter 9). Symptom: Pulses are broad with low power Possible Causes Fine PHASE adjust is not set properly. ' and photodiode cable(s) are not the originals. Pump power is too low. Possible oxygen or 'Ontamination from the purge source. Corrective Action Use the fine PHASE adjust on the Model 3955 electronics module to set the system for short, high-power pulses. Refer to "Coarse Phase Adjustment ..." in chapter 6. Increase pump power. Use only dry, oil-free, Electronic Grade 5 nitrogen gas from a cylinder. Avoid boil-off tanks which might contain oxygen or water vapor. Check the color of the desiccants in the molecular-sieve assembly in the Model 3910 and make sure they are not pink. If they are, replace the assembly (refer to chapter 9). Symptom: Satellite pulses are evident when viewed on an autocorrelator Possible Causes Room lights are too bright. Pump power is too high (ps configuration) Pump power is too high (fs configuration) Corrective Action Turn off the room lights. If the pulses disappear, they are phantom satellite pulses. To eliminate them, cover the autocorrelator to block room light. Check for real satellite pulses by turning the GTI POSITION control on the laser head control panel. If the pulses are real, i.e., they move away from or closer to the main pulse as the POSITION control is adjusted, they are caused by high pump power (cw breakthrough). Turn pump power down until the satellites disappear. Refer to appendix B, "CW Breakthrough." Tsunami power should still meet specification. If not, contact your Spectra-Physics Lasers service representative for help. If the satellite pulses are real, they disappear when you block the pump beam to the Tsunami. If they are phantom, see "Room lights" above. If you have real satellites, they are caused by high pump power (cw breakthrough). Turn pump power down until the satellites disappear. Refer to appendix B, "CW Breakthrough." Tsunami power should still meet specification. If not, contact your Spectra-Physics Lasers service representative for help.
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Tsunami Mode-locked Ti: sapphire La
Page 5 and 6:
Table of Contents ... Preface .....
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Table of Contents . Chapter 6: Alig
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Table of Contents Chapter 10: Optio
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Table of Contents Figure 4-7: Typic
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Table of Contents Figure A-6: The f
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Warning Conventions The following w
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List of Abbreviations Used in this
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Tsunami Figure 1-1: The Tsunami Las
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Chapter 2 Laser Safety DANGER The T
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Laser Safety CA UTlON Use of contro
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1 1 1 Il I 11 I I 1 El l11111II~Ill
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Chapter 3 Laser Description General
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Laser Description growth techniques
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Laser Description - AOM OC n Fast P
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Laser Description 2.4 - 2.2 - 2.0 -
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I IIIIIN III I I 1 I 11111 i~ I I I
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I II li I I I i 1 il I 1 11 I 1 1 1
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I Laser Description . Outline Dimen
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Tsunami Input Bezel Connections The
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Tsunami Opto-Mechanical Controls Al
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Tsunami Blue Knob: Vertical Adjust
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~lpl~ f \ Tsunami Opto-Mechanical C
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Tsunami Figure 4-7: 'Qpical MONITOR
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Tsunami r @ Spectra-Physics - - 4 2
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Tsunami Laser Installation Installi
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Tsunami Setting up the Routing Mirr
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Tsunami Aligning the Tsunami Laser
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Tsunami A -----------. PHOTODIODE O
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Tsunami Removing the Purge Line fro
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Tsunami Motorized Mount "Dm-shaped
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Tsunami I I J3 3930 - - - #,-,I --J
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Tsunami CA UTION DO NOT remove or a
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Tsunami Refer to the tables at the
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Tsunami b. Move the stage by hand a
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Tsunami There will be one or two re
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Tsunami Figure 6-9: The Slit Contro
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Tsunami b. Place a white card with
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Tsunami Aligning the Photodiode PC
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Tsunami To measure pulses, use a Sp
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Tsunami pulses, adjust the coarse c
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Tsunami Selecting, Installing, and
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Tsunami Unless you are certain the
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Tsunami Prism Translation Adjust Fi
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Tsunami i. Route the GTI heater cab
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Tsunami Figure 6-18: Pr1/Pr4 prisms
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Tsunami Converting Between fs and p
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Tsunami b. Using an ir viewer, adju
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Tsunami g. Open the shutter. 15. Al
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Tsunami 10. Move Prl and Pr4 into t
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Tsunami 21. Mode lock Tsunami. Refe
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I " n 3 1 ' ! ' I . I 8 8 8 " t 8 0
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Tsunami recommend using 99.999% pur
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Tsunami Mode Locking the Laser 6. W
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Tsunami - - - 710 nrn - - 790 nrn -
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4 Tsunami Beam % 2 mm (0.08 in.) Pr
Page 120 and 121: Tsunami Table 7-1: Bi-fi Selection
Page 123 and 124: I I1 ! I : I I I ill 8 I !Il! I1I l
Page 125 and 126: Lok-to-Clock Electronics LEVEL cont
Page 127 and 128: Lok-to-Clock Electronics AOM M5f-4
Page 129 and 130: Lok-to-Clock Electronics Installing
Page 131 and 132: I I1 I i l l I iil 111 ,111 Ill ,il
Page 133 and 134: P Lok-to-Clock Electronics Model 20
Page 135 and 136: I 1 1 I 1~~~ 11 I 1 1 1 1 .III :ill
Page 137 and 138: Lok-to-Clock Electronics Figure 8-9
Page 139: I I1 I l I 1 bll Lok-to-Clock Elect
Page 142 and 143: Tsunami "Clean" is a relative descr
Page 144 and 145: Tsunami Figure 9-1: Drop and Drag M
Page 146 and 147: Tsunami With the exception of pump
Page 148 and 149: Tsunami On rare occasions, the lowe
Page 150 and 151: Tsunami 8. Open the pump laser shut
Page 152 and 153: Tsunami 7. Remove the screws (4) ho
Page 154 and 155: Tsunami DryJClean Flow Adjust Nitro
Page 156 and 157: Tsunami diode such as the Model 393
Page 158 and 159: €968-PEP0 ES68-PEP0 PS68-PEP0 ES6
Page 160 and 161: Tsunami Check marks indicate which
Page 162 and 163: Tsunami Table 10-11: GTI and Bi-Pi
Page 164 and 165: Tsunami Generic Troubleshooting (No
Page 166 and 167: Tsunami Symptom: Laser will not mod
Page 168 and 169: Tsunami Symptom: Unable to mode loc
Page 172 and 173: Tsunami Symptom: Cannot see individ
Page 174 and 175: Tsunami Symptom: PZT oscillates whe
Page 177 and 178: I I ill ; I l l I I lll.l1 I I I *
Page 179 and 180: I I 111 il I iil i lllill ll I I ll
Page 181 and 182: I I il : I I I 1 I Appendix A Mode
Page 183 and 184: Mode Locking is chosen to be the sa
Page 185 and 186: I I 0 I I 1 I )I Ulllllll ill I Mod
Page 187 and 188: Mode Locking SPM will, thus, broade
Page 189 and 190: Mode Locking The net intracavity GV
Page 191 and 192: Appendix B Pulse Width Measurement
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Page 195 and 196: Pulse Width Measurement -% GVD Comp
Page 197 and 198: I I I I I I I I ti 911 I1 I Pulse W
Page 199 and 200: I I I I I I B I IL 1 1 i 1111 I L I
Page 201 and 202: I I 0 I I 1 1 L I I Pulse Width Mea
Page 203 and 204: Appendix C Setting the Line Voltage
Page 205 and 206: Appendix D Material Safetv Data She
Page 207 and 208: Material Safety Data Sheets MATERIA
Page 209 and 210: I I I 1 r $1 I Bill II I I I I Ill
Page 211 and 212: Material Safety Data Sheets MATERIA
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Tsunami - Beckman Institute Laser Resource Center

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