Figure 2-26: Finished Shg Assembly - NORTHROP GRUMMAN Iklwa II TEM00 Service Manual

12. Inspect the crystal surface for cleanliness under a 10x microscope. Remove
13. Bridge tack ball plungers with 2216 epoxy.
14. Install the top mount with new SHG crystal into the laser. Align the assembly
15. Remove the aperture assembly.
16. Turn on the chiller. Set the Q Switch to parameters specified on the ATP Test
17. Verify the beam hits the center of the SHG crystal. See Figure 2-28 for ideal
18. See Figure 2-27. If reflections are not vertical, rotate the top of the SHG
19. See Figure 2-27. Place a shim with proper thickness between the SHG
© 2019 Cutting Edge Optronics

Figure 2-26: Finished SHG assembly

any debris using nitrogen or clean, dry air.
so the face of the crystal is perpendicular to the beam path. Don't tighten the
three #8 screws at this moment. Connect the assembly to the TEC Controller.
Report Data Summary. Open the shutter. Set the drive current slightly above
the threshold. Set the TEC temperature at 30ºC for the starting point.
alignment. Base screws can be loosened to center the beam through the SHG
crystal.
assembly so the satellite beams seen on the power meter detector overlap the
main laser beam as shown in Figure 2-27.
assembly base and the laser bench to make the beams overlap in the vertical
direction as shown in Figure 2-27. Loosening the base screws will be
required. Tighten all the screws for the SHG assembly and top mount.
Chapter 3: Tuning and Testing Procedures
33 Patara II and Iklwa II Service Manual