Tsunami - Beckman Institute Laser Resource Center

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Tsunami CW Breakthrough Under certain circumstances, it is possible for a mode-locked Tsunami laser to exhibit a small continuous wave (cw) component along with the pulsed output. This phenomenon is generally restricted to systems operating in the fs regime where intracavity prisms are used for dispersion compensation. It usually occurs when either the input pump power is too high or the intracavity dispersion compensation is incorrect. It can easily be removed by reducing the ion laser pump power or by adjusting the prism dispersion compensation control on the Tsunami laser. There appears to be no analogous dual mode operation in the ps regime (where a GTI is used for dispersion compensation). Too high an input power in a ps system usually results in satellite temporal pulses. Because of the dynamic range limitation of photodetectors, a direct measurement of the cw background for a fs mode-locked Tsunami is impossible. For a mode-locked repetition rate of 100 MHz (105 duty cycle), with 1% of the energy in a cw component, this amounts to a base line signal 10-7 times smaller than the peak pulse height. In order to detect this cw signal level directly, a detector with a resolution of 100 fs and dynamic range of > lo7 is required. A successful measurement can be made if we take into account the fact that the cw component has a very different bandwidth than that of a sub 100 fs pulse. It is possible to determine a cw component of less than 1% with a conventional detector in conjunction with a spectrally selective device. We recommend a monochromator with a CCD detector. This also provides an accurate measurement of the output wavelength (usually required for an experiment) and the bandwidth of the pulse (required for determining the pulse time-bandwidth product and, thus, its relationship to a transform-limited pulse). Figure B-6 shows a standard setup. For a typical c 80 fs output pulse, the ratio of bandwidth to the cw linewidth is about 100 (10 nm vs. 0.1 nm). Consequently, a 1 % cw component has the same peak height as the spectral peak of the pulse. The signal detection limit of this technique is governed by the ultimate resolution of the monochromator but, with a conservative signal detection limit of about 10% of the peak height, it is possible to detect a cw component of about 0.1% (Figure B-7). During final test procedures at Spectra-Physics Lasers, all Tsunami systems are tested using an external monochromator and CCD diagnostic to ensure any cw component is less than 0.1%. d --
I I 0 I I 1 1 L I I Pulse Width Measurement CCD Camera Monochromator Variable Attenuator 95% Attenuator Video Analyzer Outpu I I Table Layout I Display - Figure B-6: A Typical Monochromator/CCD Setup Figure B-7: Output spectrum of the Tsunami monitored with an external monochromator/CCD system. (a) shows a cw component of 1 %, (b) shows a cw component of less than 0.1 %.
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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
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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
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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
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 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: I I I I I I B I IL 1 1 i 1111 I L I
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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