Tsunami - Beckman Institute Laser Resource Center

I1 I1 il ; I I I I iil I
Alignment
a. Disconnect the gray GTI heater cable at connector Jp on the laser
head pc board (refer to Figure 5-5).
b. Disconnect the black coaxial cable from the GTI (pull it straight
off), and from the J6 connector on the pc board (unscrew it).
The black cable can be left in the bottom of the laser head for
storage, but it must be disconnected from the pc board. This is a
high voltage connection.
4. Remove the GTI module.
a. Loosen the three screws holding the GTI to the rear mirror plate,
and turn the three D-shaped cam locks so the flat portion of the
cam disengages the GTI mounting ring (Figure 6-17).
b. Slide the GTI from the mirror plate, taking care not to snag the
gray heater cable on anything. Store it in its box.
5. Install the high reflector (HR).
a. Verify the correct optic is installed in the mounting ring.
Read the part number printed on its barrel. Its description and
part number is found in the tables at the end of chapter 10, "Options
and Accessories." The v-shaped arrow on the barrel points
to the coated, intracavity surface.
b. Slide the HR mounting ring into the rear mirror plate, turn the
three cam locks so the round portion of the cam captures the ring,
and tighten the screws.
6. Open the shutter and reestablish lasing.
a. Place a white card in front of mirror M5.
b. Adjust M1 vertically and horizontally to overlap the horizontal
oval fluorescent image from M1 over the vertical image from M3
on the card to form a cross-shaped image (Figure 6-7).
c. Remove the card.
7. Remove the M4 mirror holder from the ps mount position and install it
into the fs mount near the input end of the laser head (Figure 6-8). Do
not relocate the mount.
8. In like manner, remove the M5 mirror holder from its ps mount position
and install it into the fs mount near the output end of the laser
head (Figure 6-8).
Note: these last two steps are required to reestablish correct cavity
length now that the prisms will be placed in the beam path. These
mirror positions were preset at the factory.
9. Venfy the fluorescence from M4 is centered on M5.
If not centered, adjust M4 vertically and horizontally until it is.