Tsunami Mode-Locked Ti:sapphire Laser
9-8
Figure 9-3: Birefringent Filter
6. Open the pump laser shutter and use the vertical and horizontal con-
trols of M
10
to adjust for maximum output power.
Pump Mirrors P
1
and P
2
The P
1
/P
2
mirror set is not changed when wavelength ranges are changed.
And because they are not part of the laser cavity, they are less sensitive to
contamination and need little cleaning. Therefore, they rarely need to be
removed. Furthermore, since the pump beam alignment is very dependent
on the orientation of these mirrors, any removal or replacement might
require a more extensive realignment of the entire laser. However, if these
mirrors do become excessively dusty, cleaning them might improve laser
performance.
Unlike the other mirrors, P
1
is held in place by a spring-clip (Figure 6-5).
1. Close the pump laser shutter.
2. Remove the beam shield to access
P
1
.
3. Remove the
P
1
optic by pulling back on its retaining spring with a
small, clean screwdriver while extracting the optic with a plastic
hemostat.
4. Wearing clean gloves or finger cots, clean the surface using the “drop
and drag” method outlined in Step 2 of “General Procedures for Clean-
ing Optics.”
5. Return the optic to its mount. Be sure the optic seats properly.
Bi-fi Wavelength Selector (ps)
Location
for Bi-fi
Filter Holder
Setscrew
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