Alignment
6-27
Go to Step 3 if your laser is configured for fs operation, otherwise skip to
Step 6.
3. Carefully remove the slit assembly (if present).
a. Close the shutter.
b. Support the slit assembly with your hand and loosen the setscrew
that holds it onto the spindle of the micrometer (Figure 6-8), then
slide the assembly down and off the micrometer shaft.
c. Open the shutter.
d. Using the prism dispersion compensation control, adjust the prism
Pr
2
/Pr
3
assembly so the beam is at least 5 mm from the apex.
4. Replace the high reflector at M
1
.
Unscrew the high reflector holder, replace the high reflector in the
holder with the appropriate optic for the chosen wavelength, and screw
the holder back in.
5. Set the position of Pr
1
and Pr
4
(Figure 6-9) to maintain the position of
the fluorescent spots outside the cavity.
The fluorescence from the beam might pass over the apex of Pr
1
and
Pr
4
, missing them, and pass through the AOM and out the laser. To
ensure the alignment is performed correctly, temporarily move the
prisms a bit further into the beam to ensure the fluorescence passes
through them. Refer to Table 6-6 and Figure 6-22.
a. Loosen the setscrew that locks prism Pr
1
in place, and move the
prism up by turning its prism translation adjust screw 3 to 4 turns
(Figure 6-19). Small holes in the beam shields provide access to
the drive screws. Tighten the setscrew.
b. Repeat Step a for prism
Pr
4
.
c. Skip to Step 8.
6. Temporarily remove the bi-fi filter and set it aside.
7 Replace the GTI at M
1
with the new GTI.
a. Turn off the Model 3955 electronics module.
b. Remove the plastic cover from the laser head pc board (3 screws)
and disconnect the gray GTI heater cable from connector J
2
(Figure
6-20).
c. Disconnect the black coaxial control cable from the GTI by pulling
it straight off.
Be sure to support the slit assembly as you loosen its clamping setscrew
to prevent it from falling off and damaging the optics below.
Warning!
The pc board on the floor of the laser head contains high voltage. Turn
off the Model 3955 electronics module to disable this board when
changing the
GTI.
Danger!
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