Figure 2-11: Pinhole Alignment With Pinless Aperture - NORTHROP GRUMMAN Iklwa II TEM00 Service Manual

8. Torque the 8-32 laser module mounting hardware to 25 in-lbs. Tighten the
9. Verify HeNe alignment to pinhole in location 4 of Figure 1-3. Rotate and
10. See Figure 2-11, above. Place the pinless alignment aperture in the beam path
11. Replace SHG assembly and mount in the center of the mounting slots. Ensure
12. Remove the pinless alignment aperture.
13. Reposition Q-switch to original location in the beam path. Make sure the
14. Align the HeNe reflection to the first pinhole by rotating the Q-switch
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plumbing jumpers.
shim the Output Coupler if needed to align the front surface reflection
(reflection closest to the module) to pinhole location 4. Replace HM
assembly.

Figure 2-11: Pinhole Alignment with Pinless Aperture

between the Output Coupler and the HM. Center the alignment aperture with
the HeNe so that the HeNe passes through the pinhole. Adjust the HM
reflection back onto the pinless alignment aperture.
NOTE:
Pinless alignment aperture may not be perfectly aligned in the vertical axis
during HM alignment. It is acceptable as long as a significant amount of green light
passes through the pinhole for alignment.
that the HeNe passes through the center of the crystal. Align crystal reflection
to the pinless alignment aperture.
HeNe goes through the center of the Q-switch crystal.
assembly in the horizontal axis. Tighten the mounting screws.
NOTE:
Vertical axis reflection may not be perfectly aligned with the pinhole. No
adjustment is needed to correct this.
Chapter 3: Tuning and Testing Procedures
22 Patara II and Iklwa II Service Manual