Tsunami - Beckman Institute Laser Resource Center

I1 I1 I I I iil I miin II I l I Lllll lli U il Ill i i ill I1 I I I UQ I I I I
Alignment
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Requirements for Conversion
I
To convert Tsunami from fs to ps operation requires the following:
Changing output coupler Mlo.
Removing the tuning slit and adding the appropriate bi-fi into the
cavity.
Moving Prl and Pr4 out of the beam path.
Replacing the high reflector at M1 with the GTI.
To convert from ps to fs operation, simply reverse this procedure.
NOTE
When changing between fs and ps measurements, the scan range of the
Spectra-Physics Lasers Model 409 autocorrelator must be modified in
order to accommodate for the large change in pulse width. Consult your
autocorrelator manual for this procedure.
Fs to ps Conversion
Verify the Tsunami laser is lasing prior to beginning this procedure, and
maximize its output power.
1. Close the pump laser shutter.
2. For safety, turn off the Model 3955 electronics module.
3. Remove the high reflector assembly.
a. Loosen the three screws holding the high reflector mounting ring
in the rear mirror plate, and turn the three D-shaped cam locks so
the flat portion of the cam disengages the mounting ring. The
high reflector assembly is removed in a manner similar to that for
the GTI shown in Figure 6-17.
b. Pull the high reflector assembly with its mounting ring from the
rear mirror plate and store it in a safe place.
4. Install the GTI (Figure 6- 17).
Refer to chapter 5, "Installation: Installing the GTI."
5. Turn on the Model 3955 and allow about 20 minutes for the GTI and
AOM to warm up.
You may continue with the installation while you wait for the heaters
to warm up.
6. Open the shutter, and re-establish lasing.
a. Place a white card in front of mirror M5.