Tsunami - Beckman Institute Laser Resource Center

Tsunami
b. Using an ir viewer, adjust M1 vertically and horizontally to overlap
the reflected horizontal oval fluorescent image onto the vertical
oval from M3 as seen on the white card. A cross-shaped image
results.
c. Remove the card.
Lasing should begin.
d. Adjust the laser for maximum output power.
7. Remove the tuning slit.
WARNING
Support the slit assembly with your hand when loosening the setscrew
to prevent it from falling off and damaging the optics below.
I
-,
a. Close the shutter.
b. Loosen the setscrew holding the slit assembly to the spindle of
the micrometer (Figure 6-9), and slide the slit down and off the
micrometer shaft.
8. Move Prl and Pr4 out of the beam path.
a. Loosen the setscrew on each prism dovetail mount (Figure 6-16). I
b. Using a hex ball driver, adjust the screw on the mount exactly 10
turns clockwise to drive each prism out of the beam path. You
need to be exact in your turns because, when you convert the
laser back to fs operation, you must return the prism to its original
position.
Small holes in the beam shields provide access to the drive
screws.
c. Tighten the setscrews. Do not over-tighten.
9. Install the bi-fi.
Refer to "Selecting, Installing, and Aligning the Birefringent Filtery'
earlier in this chapter for information on installing the bi-fi.
a. Once installed, open the pump laser shutter.
b. If lasing is not re-established, return to step 6.
c. Adjust M2 to recenter the beam on the GTI.
d. Place a white card in front of M5 and overlap the two fluorescent
images of MI and Mg on the card (it becomes a cross-shaped
image).
e. Remove the card.