Tsunami - Beckman Institute Laser Resource Center

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Tsunami Generic Troubleshooting (Non-LTC Systems) Symptom: No output Possible Causes insufficient pump power Cavity optics are out of alignment. Bid is incorrectly set for ps configuration Mirrors are in backwards' OptiCS are in wrong locations. A white card was left in the beam path. Chiller is not on. Corrective Action Pump power must be > 8 W for a 12 W pump configuration. Pump power must be >3 W for a 6 W pump configuration. Adjust MI and Mlo as described in chapter 6, "Alignment: Cavity Alignment." If these adjustments fail to restore output, refer to the next cause below. Rotate the optic in its mount. Tsunami will lase at some point during rotation. Refer to chapter 6, 'Alignment: Selecting, Installing and Aligning the Birefringent Filter." Check the optics. Verify that each optic is installed correctly. Refer to chapter 9, "Maintenance," for information on the removal and orientation of optics. Two or more optics might have been swapped to the wrong mounts. Refer to the tables at the end of chapter 10 for a list of part numbers and their related positions. Remove the card. Turn on the chiller. Symptom: Low output power Possible Causes Low pump power. Poor pump laser mode quality. Unstable ion laser. Optics are dirty. Check the pump laser output power. Corrective Action Check the pump laser output power and mode (TEMoo mode from the pump laser is required). 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. Try another aperture setting. 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. P2 6. M3 (both surfaces) 7. M2 8- M4r M5 9. M7, Ms 10. M6, Mg 11. Ml0, M1 12. AOM 13. Beam splitter (highly unlikely it will need cleaning)
Service and Repair Symptom: Low output power (cont.) Possible Causes Corrective Action Tsunami is not optimized. Refer to chapter 7, "Operation: Optimizing Laser Output." Cavity focus mirror alignments are not optimized. Do not move the translation positions of M2 and M3 after initial alignment. If they have been moved, refer to chapter 6, "Alignment: Cavity Alignment." Cavity Optics alignment. are Out Of Pump focus mirror Pp is out of position. Rod position is not optimized. Chiller is not on. Adjust MI and Ml0 as described in chapter 6, "Alignment: Cavity Alignment.'' Unless the position of P2 was moved since installation, this adjustment should not be necessary. Adjust P2 as described in chapter 6, "Alignment: Cavity Alignment." Adjust the rod position as described in chapter 6, "Alignment: Cavity Alignment." Turn on the chiller. Symptom: Laser will not mode lock Possible Causes Pump laser is not warmed up. Tsunami is not optimized. Poor beam mode profile. Improper phase adjustment. Wavelength on or near water or oxygen absorption lines. Possible Feedback Corrective Action Refer to pump laser instruction manual for required warm-up time. Refer to chapter 7, "Operation: Optimizing Laser Output." With the beam directed to far field (e.g., displayed on a wall), adjust M2 to obtain a solid, slightly elliptical mode with high contrast. There should be no spikes on the outer edges of the beam profile. Press the STATUS mode locker enable button on the Model 3955. lncrease the gain on the autocorrelator and angle-tune the doubling crystal to search for the autocorrelator signal. Adjust the fine PHASE control for the highest signal, then adjust the GTI POSITION control to obtain the pulse. If there is no noticeable change in the autocorrelator signal, center the PHASE LED display using the PHASE fine control. Increase the autocorrelator signal by adjusting the coarse phase control inside the Model 3955 (refer to "Coarse Phase Adjustment ..." in chapter 6). Test for proper mode locking (refer to "Test for Proper Mode Locking" in chapter 6). Lower the pump power and repeat the above if a pulse still does not appear. Refer to Figure 7-1 to see if your operating wavelength is on or near the absorption region. If so, purging is necessary. Note that more intense absorption lines require larger quantities of purge gas for longer periods of time. For operation near 900 to 980 nm, a purge rate of >0.17 m3/hr (6 SCFH) for >4 hours is essential for problem-free mode locking. 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.
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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
Page 33 and 34:
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
Page 114 and 115: Tsunami Mode Locking the Laser 6. W
Page 116 and 117: Tsunami - - - 710 nrn - - 790 nrn -
Page 118 and 119: 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 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 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
Page 193 and 194: I I 0 I I 1 1 LI I lillll Ill I!,ll
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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