CAL & ADJUST
3-9
Versapulse Select Service Manual
0621-499-01 03/94
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The burn should be centered over the cross hairs. If not, adjust ("walk" as described
in the following subparagraph) the OC/HR positions to bring the burn into center,
rechecking as necessary as in step "b" above. Continue adjustment until the burn
footprint is centered in the cross hairs.
"Walking" the beam refers to the method of adjusting the OC and HR in the
same direction and distance, so that the two mirrors remain in the same
orientation with each other, but are brought to a new orientation with
respect to the rod. Each mirror mount has a horizontal and a vertical
adjustment screw. For example, to walk the beam "up" with respect to the
hole, the OC vertical adjustment would be turned in, then the HR vertical
adjustment would be turned out the same amount (don't be fooled as to the
direction to turn the adjustment screw by the fact that the two screws are
mounted in opposite directions - one screw is being turned in and the other
is being turned out, but because the screws are mounted in opposite
directions the screws rotate in the same direction).
d.) Once the burn has been centered in the cross hairs, remove the cross hair aperture and
place the power meter head behind the hole, so that the YAG energy through the hole will
strike the power meter head. Fire the laser into the head and adjust the OC to peak the cavity
power output.
e.) Replace the cross hair aperture and recheck the beam centering through the hole as in step
"b" above. Some slight readjustment of the HR may be necessary to recenter the burn in the
cross hairs.
f.) Repeat steps "d" and "e" until the power is peaked and the burn is centered in the cross
hairs, with the HR and OC adjustment mechanisms locked down.
5. Center the YAG beam through the wedge optics and into the fiber port.
For each channel, two optics are adjusted to position the YAG beam down the intended optical path
into the center of the fiber; the first relay mirror and the second (plano) relay mirror.
The second relay mirror seldom needs to be adjusted. It provides a much wider range of
movement of the beam than the first relay mirror. The four second relay mirrors are all
mounted on the cavity OC wall. Although the second relay mirror mounts are shaped
differently than the other channel mirror mounts, the mounting and adjusting hardware is
the same - each is held in place by a spring loaded mounting screw and each has a horizontal
and vertical adjusting screw with locking nut.
The first relay is normally the only adjustment needed to get the YAG beam centered through
the wedge optics and centered into the fiber port.
a.) Use the test aperture to check the YAG channel centering into the second wedge optic opening.
Examine the burn and proceed as follows:
An acceptable burn is to be centered and no clipping should be seen. If the burn is
acceptable, go on to step "b" below.
12/95
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