Tsunami Mode-Locked Ti-sapphire Laser
6-36
8. Close the shutter and remove the tuning slit.
Loosen the screw holding the slit assembly to the spindle of the
micrometer (Figure 6-8), and slide the slit down and off the microme-
ter shaft.
9. Move Pr
1
and Pr
4
out of the beam path.
a. Loosen the setscrew on each prism dovetail mount (Figure 6-19).
b. Using a hex ball driver, adjust the screw on each mount exactly 10
turns clockwise to drive the prisms out of the beam path.
Be exact in your turns because the prism has to be returned to its
original position when you convert the laser back to fs operation.
Small holes in the beam shields provide access to the drive screws.
c. Tighten the setscrews, but do not over-tighten.
10. Install the bi-fi.
Refer to “Selecting, Installing, and Aligning the Birefringent Filter”
earlier in this chapter for information on installing the bi-fi.
a. Once installed, open the pump laser shutter.
b. If lasing is not reestablished, perform Step 6.
c. Adjust M
2
to recenter the beam on the GTI.
d. Place a white card in front of M
5
and overlap the two fluorescent
images of M
1
and M
3
on the card (the image again becomes cross-
shaped).
e. Remove the card.
11. Remove the M
4
mirror holder from its fs mounting position and install
it into the ps mounting position near the output end of the laser head
(see Figure 6-7).
12. In like manner, remove the M
5
mirror holder from its fs mounting posi-
tion and install it into the ps mounting position near the input end of
the laser head (Figure 6-7).
Note: these last two steps are required to reestablish correct cavity
length now that the prisms are out of the beam path.
13. Verify the fluorescence from
M
4
is centered on M
5
.
If not correctly positioned, adjust M
4
vertically and horizontally until it
is correctly positioned. If you adjust M
4
, readjust M
5
to recenter the
beam from M
5
on the AOM.
Support the slit assembly with your hand when loosening the setscrew
to prevent it from falling off and damaging the optics below.
Warning!
During the next two steps, do not disturb the M
4
and M
5
mirror mounts
themselves. Their positions were preset at the factory.
Caution!
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