Operation
7-11
2. Align the Tsunami so that the Millennia beam passes through the cen-
ter of the brewster window and hits P
1
above its center.
The beam must hit the top of the mirror without missing the coating.
This ensures that the beam from P
2
to M
3
does not clip P
1
.
3. Direct the beam to the center of both
M
2
and M
3
.
Use the vertical and horizontal controls on
P
1
and P
2
to direct the beam
to the center of M
2
and M
3
. This step is critical if you are to realize per-
formance consistent with that of a system aligned at the factory.
4. Direct the beam from M
2
onto M
1
. Do not hit the top of M
1
nor clip the
bottom of the P
1
bracket.
5. Set the Millennia output power to 5.0 W.
6. Close the shutter and remove the tuning slit.
Loosen the setscrew holding the slit assembly to the spindle of the
micrometer (Figure 6-8), and slide the slit down and off the microme-
ter shaft.
7. 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 normal fs
operation.
Small holes in the beam shields provide access to the drive screws.
c. Tighten the setscrews, but do not over-tighten.
8. Place a business card in front of M
5
.
9. Adjust
M
3
so that the fluorescence from it hits where the center of M
5
would be.
This fluorescence looks like a square, approximately 3 by 4 mm.
10. Adjust M
1
so that the fluorescence from M
1
is centered in the square
seen in Step 9. This fluorescence should look like a small spot.
11. Remove the card from in front of M
5
.
12. Place a white card about 6 in. outside the laser cavity in front of the
output window and, using an IR viewer, view the fluorescence through
the output coupler. Adjust M
3
for the brightest spot.
13. Adjust
M
1
for the brightest spot.
14. Adjust the OC to until the unit lases.
15. Using an IR viewer, look at the back of M
8
and adjust the OC so that
the reflection from the OC overlaps the intracavity fluorescent spot as
Support the slit assembly with your hand when loosening the setscrew
to prevent it from falling off and damaging the optics below.
Warning!
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