Tsunami - Beckman Institute Laser Resource Center

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Tsunami Symptom: Cannot see individual pulse on the oscilloscope Possible Causes Phase adjustment is significantly away from optimum. Autocorrelator not optimized. Corrective Action Adjust the fine PHASE control on the electronics module. If unsuccessful, refer to "Coarse Phase Adjust ..." in chapter 6 for information on coarse adjustment. See autocorrelator manual. Troubleshooting LTC Systems Symptom: When LOCK is enabled, only the top and bottom LEDs are illuminated on the STATUS display. Possible Causes The M4 PZT is not connected. Corrective Action Verify the driver cable is attached to the M4 PZT mirror. Symptom: More than two LEDs on the STATUS bar display are illuminated when LOCK is enabled (ps conf"1guration only). Possible Causes GTI and'or the fine PHASE control not optimized. Pump power too low or too high. Optics are dirty. Tsunami is not optimized. Corrective Action Maintain LOCK and adjust the fine PHASE control and the GTI position control until less than two LEDs are lit in the STATUS bar display. Adjust pump power, the GTI, and the fine PHASE control until the autocorrelator scope trace becornes stable. Inspect the optics for dirt or contamination. If dirty, clean the optics in the following order, using the cleaning procedure in chapter 9, "Maintenance." This list orders the optics by influence in power loss. If an optic is dirty, an ir viewer will show unusual scatter. 1. Input and output Brewster window surfaces 2. Prisms 3. Rod surfaces 4. Bi-fi (ps configuration), outside surfaces only 5. p1, p2 6. M3 (both surfaces) 7. M2 8. M4i M5 9. M7, Ms 10. M6, M9 11. Mia, Mi 12. AOM 13. Beam splitter (highly unlikely it will need cleaning) Refer to chapter 7, "Operation: Optimizing Laser Output."
I I I il l I 11 I I I I l l I , I Ill , I1 I Ill. .ll i I I. 111 I 11 1 1 Service and Repair Symptom: The entire STATUS bar display flashes when Model 3930 LOCK is enabled. Possible Causes Difference in reference and cavity frequencies exceeding 100 Hz. PZT connections have not been made. Tsunami is not properly aligned and optimized. Possible Feedback Corrective Action Disable the LOCK and adjust cavity frequency to match the reference frequency to within 100 Hz (the last digit on the display reads tens of Hz). Disable the LOCK. Inspect all cables and connections from the Model 3930 to the PZT. Disable the LOCK. Verify Tsunami is operating properly. Feedback occurs when a reflection from a flat surface (such as a mirror, fiber, or the plano surface of a lens) enters the laser cavity. Feedback radiation of a few mW may disrupt mode locking. To test for possible feedback, set up a fast photodiode (or the Model 409 autocorrelator) to monitor the Tsunami pulse using a beam splitter between the Tsunami and the suspected feedback source. If stable pulse operation is obtained after blocking the beam to the suspected source, you have a feedback problem. Try realigning the suspected device to the Tsunami laser. If this does not work, try installing a Faraday or other isolator in your optical system. When selecting an isolator, be sure it can accommodate the Tsunami wavelength tuning range. Symptom: System locked up but drifts out of the capture range of the PZT. Possible Causes Ion laser not stable. Tsunami not stable. Reference oscillator not fully warmed up. Environmental problem. Corrective Action Refer to the ion laser troubleshooting section in its user's manual. Refer to "Long-term stability is poor" in this troubleshooting guide. The Model 3930 must be warmed up for over 24 hours before stable operation can be expected. Avoid temperature swings r + 3°C; avoid turbulent airflow over the entire system. Do not allow the cooling water to change temperature drastically or to cycle. - I Symptom: High phase noise in fs operation but the STATUS bar display is normal. Possible Causes Tsunami drifted Off alignment. Pump power too high Or too low. Too much prism glass in the cavity. 'lit width too narrow Or too wide. Corrective Action Refer to chapter 7, 'operation: Optimizing Laser Output." Monitor the bandwidth for cw breakthrough with either a camera through a monochromator or a grating, disable the LOCK and adjust the pump power to get rid of cw breakthrough. Refer to appendix B, "CW Breakthrough." Monitor the bandwidth for cw breakthrough as above, then disable the LOCK and back prism glass out of the beam by adjusting the prism pair Pr2/Pr3. Monitor the autocorrelator trace and adjust the slit and prisms Pr2 and Pr3 to maximize the signal. (The wider the slit, the larger the amount of prism glass in the cavity). For a given wavelength, pump power, and prism quantity, there is a specific slit width that yields maximum bandwidth and power and prevents cw breakthrough.
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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
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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 170 and 171: Tsunami Symptom: Unable to mode loc
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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