Alignment
6-39
Note: these last two steps are required to reestablish correct cavity
length because the prisms are being added to the beam path.
9. Verify the fluorescence from M
4
is centered on M
5
.
If not centered, adjust M
4
vertically and horizontally until it is centered.
10. Move Pr
1
and Pr
4
into the beam path.
a. Loosen the dovetail setscrew on each prism dovetail mount (see
Figure 6-22).
b. Physically push the prism all the way down to the bottom of its
travel.
c. Tighten the setscrews, but do not over-tighten.
11. Place a white card about 10 cm outside the output window and use an
IR viewer to see the fluorescent image.
12. Adjust M
5
to direct the fluorescence through the prism sequence and
out the laser.
13. Align M
10
.
a. Place a white card with a 2.5 mm diameter hole in it between M
4
and M
5
so that the hole is centered on the reflected fluorescent
image from M
4
.
b. Adjust M
10
vertically and horizontally to direct the reflected image
from M
10
back through the hole in the card, and overlap it with the
image coming from M
4
.
To determine which reflected image comes from M
10
, watch the M
5
side of the card and slightly adjust M
10
until one image moves.
c. Remove the card; lasing should begin.
d. Adjust M
1
and M
10
to optimize Tsunami output power.
14. Close the shutter and remove the bi-fi.
a. Turn the bi-fi micrometer fully clockwise.
b. Loosen the setscrew on the bi-fi mount holding the filter (Figure 6-
15), and carefully lift the filter out. Store the filter in its case.
15. Remove M
10
and replace it with the appropriate optic for fs operation.
Refer to the optics tables in Chapter 10.
16. Open the shutter.
17. Repeat Step 13, then adjust M
3
to center the beam on M
10
.
18. Turn on the Model 3955 electronics module and let it warm up for 20
minutes.
19. Adjust the photodiode pc board if required.
Because M
10
is wedge-shaped, the photodiode pc board might require
adjustment in order to maximize the photodiode signal (as seen on the
Model 3955 photodiode indicator). Refer to “Aligning the Photodiode
PC Board” earlier in this chapter.
20. Install the tuning slit assembly.
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