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The cross hair aperture is used to align an individual cavity (OC and HR) into the center of the first relay
mirror. To install it, the first relay mirror mount is removed, then the aperture slides into a hole in the wall
directly behind the spot the channel first relay mirror was mounted (insert from the outside of the wall, so that
it is further from the channel OC). The aperture has two small wires running across it that block a small
portion of the beam (perpendicular to each other and crossing in the center of the aperture). The resulting
burn will have the cross hairs superimposed on it. The cavity optics are adjusted to center the burn in the cross
hairs.
INSERT THE TEST APERTURE HERE
IN THE MOUNTING HOLE FOR THE
SECOND WEDGE OPTIC, BE SURE THE
TWO KEY POSTS ON THE APERTURE IS INSERTED
INTO THE TWO HOLES ON THE MOUNT.
FIG. 3.1
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