Tsunami - Beckman Institute Laser Resource Center

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Tsunami Pulse Width Selection Purging the Tsunami The pulse width tuning characteristics of the Ti:sapphire laser are influenced by two factors: those inherent in the Ti:sapphire material itself and those from cavity parameters. While we cannot readily modify the Ti:sapphire material to change pulse width, we can modify the net group velocity dispersion (GVD). The optical components in the laser cavity introduce positive GVD and cause pulse spreading. Further pulse spreading is caused by self-phase modulation (SPM) in the Ti:sapphire rod, which results from the interaction of the short optical pulse with the nonlinear refractive index. In order to obtain stable, short output pulses, these effects must be compensated with negative GVD. fs systems. Prism pairs are used to produce a net negative intracavity GVD in the fs system. This allows the system to produce < 80 fs near transformlimited pulses over most of the Tsunami wavelength regime. ps systems. In the ps configuration, a GTI is used to provide negative GVD in a patented mode locking design. This device is similar to a Fabry- Perot interferometer, except the first mirror is a partial reflector instead of a high reflector. It has the advantage of being highly reflective over a broad spectral range, yet provides a frequency-dependent optical phase shift. It also provides adjustable negative GVD when the distance between the mirrors is varied. The GTI produces a fairly large negative GVD that is linear over a narrow bandwidth. It, therefore, must be readjusted whenever a new wavelength is selected. The GTI POSITION control adjusts this spacing and allows you to obtain < 2 ps near transform-limited output pulses - over the entire Tsunami wavelength regime. For a full review of GVD and compensation, please refer to appendix A, "Mode Locking: Group Velocity Dispersion." The Tsunami head is sealed so it can be purged. The Model 3910 regulatorlfilter purge unit is provided for filtering and drying bottled nitrogen gas. Purging the laser cavity with this gas not only eliminates the typical problems associated with dust and contamination, but also prevents tuning discontinuities caused by oxygen and water vapor. Reduction of the latter is important for operation in the long wavelengths (Figure 3-7). -
I IIIIIN III I I 1 I 11111 i~ I I I u 11 I I I I i I I I r I I II 11 Plmi 111 I Laser Descri~tion WAVE NUMBER (cm-1) 14000 13000 12000 1 1000 I0000 1 .oo 0.99 . . . . , , , . s , . , . , , , , s , s . . , . . . , , , , , , , , , , LU , , , . . , . . . 0 , , , , , , , , z . . . , , , , , . . . a , . , , , , , , , , , , , . , . , , , . , , , . . , . . , , , . . , , , , . . . , , , , , , . . , , , , , , . . . s , . . . . . . , 0.98 : : , . . . , , , , , , , , , , , 5 . . . . . . . . . , , , , , , , , s . . , , , . Z s . . , . . , . . , . , , , , a , , , . . . , , . . , . , LT , . , , . , , , . , I- . . . , , , . , , , , , , . , s , . . . . , . . . . . , , , , . , , , , s . . , , , . , . . . . , , , , . . . . , , , . , , , , , . . , . , , . , ., . , , , . s . . . . , , . , , , , . , , , . . , , , . . . . . , . . , , . . , . , , , , , . . . . . 700 800 900 1000 1100 WAVELENGTH (nm) Figure 3-7: lhnsrnittance vs. Wavelength for Oxygen and Water Vapor.
Page 1: Tsunami Mode-locked Ti: sapphire La
Page 5 and 6: Table of Contents ... Preface .....
Page 7 and 8: Table of Contents . Chapter 6: Alig
Page 9 and 10: Table of Contents Chapter 10: Optio
Page 11 and 12: Table of Contents Figure 4-7: Typic
Page 13 and 14: Table of Contents Figure A-6: The f
Page 15: Warning Conventions The following w
Page 19: List of Abbreviations Used in this
Page 22 and 23: Tsunami Figure 1-1: The Tsunami Las
Page 25 and 26: Chapter 2 Laser Safety DANGER The T
Page 27 and 28: Laser Safety CA UTlON Use of contro
Page 29 and 30: 1 1 1 Il I 11 I I 1 El l11111II~Ill
Page 31 and 32: Chapter 3 Laser Description General
Page 33 and 34: Laser Description growth techniques
Page 35 and 36: Laser Description - AOM OC n Fast P
Page 37: Laser Description 2.4 - 2.2 - 2.0 -
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 86 and 87: 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
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I I1 ! I : I I I ill 8 I !Il! I1I l
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Lok-to-Clock Electronics LEVEL cont
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Lok-to-Clock Electronics AOM M5f-4
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Lok-to-Clock Electronics Installing
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I I1 I i l l I iil 111 ,111 Ill ,il
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P Lok-to-Clock Electronics Model 20
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I 1 1 I 1~~~ 11 I 1 1 1 1 .III :ill
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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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Tsunami - Beckman Institute Laser Resource Center

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