Tsunami - Beckman Institute Laser Resource Center

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Tsunami To measure pulses, use a Spectra-Physics Lasers Model 409 -08 autocorrelator (or equivalent). Avoid saturating the autocorrelator. Subtle adjustments to the phase-matching angle of the nonlinear crystal will be required to obtain an optimum autocorrelation signal. Refer to the autocorrelator manual for setup and operation instructions. 3. Open the pump and Tsunami shutters and adjust the pump laser until your Tsunami achieves the output power specified in Table 3-1 or Table 3-2. 4. Test for proper mode locking. Aligning the A10 Modulator (AOM) While watching the pulse on the oscilloscope, block the intracavity beam for a couple of seconds with a card, then remove the card. If the mode locker system is operating properly, the pulse on the oscilloscope should return immediately. If it does, you do not need to align the AOM and cavity alignment is completed. If there was no pulse initially, or if the pulse did not return after interrupting the intracavity beam, continue with "Aligning the A10 Modulator (AOM) . The photodiode alignment earlier in this chapter must be performed before you align the AOM. It assures a maximum photodiode signal for reliable mode locking. Proper AOM alignment is critical for both ps and fs Tsunami lasers. The following procedure assures good AOM beam alignment for optimum mode locking. Figure 5-3 is a system interconnect diagram to assist you in verifying correct cable connections. Figure 6-12 shows the location of the AOM. 1. Verify the output beam is centered on Mlo. Place a white card between M10 and the beam splitter, and use the edge of the card to detect the position of the beam. 2. Using the vertical control knob of MI0, detune the laser until it stops lasing. 3. Verify the intracavity beam is centered in the AOM. Use an ir viewer to see that the M3/M1 fluorescence is centered through the silhouette of the AOM crystal. The fluorescence should not be near the edges of the crystal. If necessary, loosen the AOM mounting bracket to adjust it vertically and horizontally. Two 2-56 setscrews hold it horizontally while two in. cap screws keep it secured vertically.
1 l1 I Ill I 1 0 II I I Il lllll lll U ii I Ill I I i Ill Llill I I Ill I I Alignment - Output Coupler (MlO) Positioning Controls Horz. Vert. AOM SMA Connector AOM Pitch Control AOM Aperture Window Photodiode PC Board Mounting Screws (2) AOM Mounting Screws (2) Beam Splitter Output Coupler (Mlo) AOM Horizontal Angle Control Figure 6-12: AOM, Output Coupler, Photodiode PC Board, and Beam Splitter 4. Readjust M10 vertically to re-establish lasing and to optimize output. 5. Adjust the mode locker phase. If the signal displayed is not a short pulse (about 80 fs for the fs configuration or 2 ps for the ps configuration), adjust the fine PHASE control on the Model 3955 electronics module until either a short pulse appears on the oscilloscope or the autocorrelator signal is maximized. If the phase adjustment is far from the optimum setting, the pulses might be too broad to see individual pulses on the oscilloscope. If this occurs, see "Symptom: Laser will not mode lock" in the troubleshooting guide in chapter 11. If you are using cables other than those shipped with the system, converted from ps to fs, or vice versa, or changed from extra-long to standard wavelength, or vice versa, the phase signal might have moved outside the range of the fine PHASE control. Note: an 80 MHz pulse train corresponds to a pulse every 12 ns and the fine PHASE control provides only 100 ps of phase adjustment. If you cannot see
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Tsunami Mode-locked Ti: sapphire La
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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
Page 35 and 36: Laser Description - AOM OC n Fast P
Page 37 and 38: Laser Description 2.4 - 2.2 - 2.0 -
Page 39 and 40: I IIIIIN III I I 1 I 11111 i~ I I I
Page 41 and 42: I II li I I I i 1 il I 1 11 I 1 1 1
Page 43: I Laser Description . Outline Dimen
Page 46 and 47: Tsunami Input Bezel Connections The
Page 48 and 49: Tsunami Opto-Mechanical Controls Al
Page 50 and 51: Tsunami Blue Knob: Vertical Adjust
Page 52 and 53: ~lpl~ f \ Tsunami Opto-Mechanical C
Page 54 and 55: Tsunami Figure 4-7: 'Qpical MONITOR
Page 56 and 57: Tsunami r @ Spectra-Physics - - 4 2
Page 58 and 59: Tsunami Laser Installation Installi
Page 60 and 61: Tsunami Setting up the Routing Mirr
Page 62 and 63: Tsunami Aligning the Tsunami Laser
Page 64 and 65: Tsunami A -----------. PHOTODIODE O
Page 66 and 67: Tsunami Removing the Purge Line fro
Page 68 and 69: Tsunami Motorized Mount "Dm-shaped
Page 70 and 71: Tsunami I I J3 3930 - - - #,-,I --J
Page 72 and 73: Tsunami CA UTION DO NOT remove or a
Page 74 and 75: Tsunami Refer to the tables at the
Page 76 and 77: Tsunami b. Move the stage by hand a
Page 78 and 79: Tsunami There will be one or two re
Page 80 and 81: Tsunami Figure 6-9: The Slit Contro
Page 82 and 83: Tsunami b. Place a white card with
Page 84 and 85: Tsunami Aligning the Photodiode PC
Page 88 and 89: Tsunami pulses, adjust the coarse c
Page 90 and 91: Tsunami Selecting, Installing, and
Page 92 and 93: Tsunami Unless you are certain the
Page 94 and 95: Tsunami Prism Translation Adjust Fi
Page 96 and 97: Tsunami i. Route the GTI heater cab
Page 98 and 99: Tsunami Figure 6-18: Pr1/Pr4 prisms
Page 100 and 101: Tsunami Converting Between fs and p
Page 102 and 103: Tsunami b. Using an ir viewer, adju
Page 104 and 105: Tsunami g. Open the shutter. 15. Al
Page 106 and 107: Tsunami 10. Move Prl and Pr4 into t
Page 108 and 109: Tsunami 21. Mode lock Tsunami. Refe
Page 110 and 111: I " n 3 1 ' ! ' I . I 8 8 8 " t 8 0
Page 112 and 113: 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
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Page 133 and 134: P Lok-to-Clock Electronics Model 20
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Lok-to-Clock Electronics Figure 8-9
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I I1 I l I 1 bll Lok-to-Clock Elect
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Tsunami "Clean" is a relative descr
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Tsunami Figure 9-1: Drop and Drag M
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Tsunami With the exception of pump
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Tsunami On rare occasions, the lowe
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Tsunami 8. Open the pump laser shut
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Tsunami 7. Remove the screws (4) ho
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Tsunami DryJClean Flow Adjust Nitro
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Tsunami diode such as the Model 393
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€968-PEP0 ES68-PEP0 PS68-PEP0 ES6
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Tsunami Check marks indicate which
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Tsunami Table 10-11: GTI and Bi-Pi
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Tsunami Generic Troubleshooting (No
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Tsunami Symptom: Laser will not mod
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Tsunami Symptom: Unable to mode loc
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Tsunami Symptom: Unable to mode loc
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Tsunami Symptom: Cannot see individ
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Tsunami Symptom: PZT oscillates whe
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I I ill ; I l l I I lll.l1 I I I *
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I I 111 il I iil i lllill ll I I ll
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I I il : I I I 1 I Appendix A Mode
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Mode Locking is chosen to be the sa
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I I 0 I I 1 I )I Ulllllll ill I Mod
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Mode Locking SPM will, thus, broade
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Mode Locking The net intracavity GV
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Appendix B Pulse Width Measurement
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I I 0 I I 1 1 LI I lillll Ill I!,ll
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Pulse Width Measurement -% GVD Comp
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I I I I I I I I ti 911 I1 I Pulse W
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I I I I I I B I IL 1 1 i 1111 I L I
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I I 0 I I 1 1 L I I Pulse Width Mea
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Appendix C Setting the Line Voltage
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Appendix D Material Safetv Data She
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Material Safety Data Sheets MATERIA
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I I I 1 r $1 I Bill II I I I I Ill
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Material Safety Data Sheets MATERIA
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