Chapter Five: Maintenance
© 2019 Cutting Edge Optronics, Inc.
40
Iklwa Laser User Manual
Approved for Public Release; NG19-2099 CEO-UMAN-0055E
Figure 5-6
illustrates an example of the dependence of the output power and pulse-to-
pulse instability of the Iklwa laser to operating current. Notice that the laser power
increases as the operating current is increased. The laser reached peak power around 23
A. Search for the peak power by changing the current 0.1 A increments around the
operating current. Once the peak power is found, lower the current to reach 99.5 percent
of the peak power. This is the proper operating current. In this example, the operating
current would be 22.9 A.
The slight difference between the actual operating current and the test report value may
be due to the performance difference of the chillers. An increase in the operating current
can compensate for the aging of the system’s laser diodes.
Figure 5-6. Example of Laser Performance Dependence on the Operating Current
5.
Peak up the laser with adjustment of the cavity mirrors.
WARNING
. Making mirror adjustments can be non-reversible. Do this step only when all
the steps above have been completed and the laser does not meet the specifications
with the correct settings.
a.
Locate the access holes for high-reflection (HR) and harmonic mirrors
(HM) . Notice the positions of HR and HM mirrors with respect to the
direction of the laser output in
Figure 5-7
.
b.
Remove screws from access holes only in a dust free environment.
c.
Use a 1/8" ball driver to make adjustments. A fine adjustment is a 1° or
less rotation. A small adjustment is about a 2° rotation. A coarse
adjustment is 15° -20° rotation. If coarse adjustments are needed to obtain
performance, reduce operating current by 2 A. Return to normal operating
current when making small and fine adjustments.
d.
The screws for the adjustments of the vertical tilt angle and the horizontal
tilt angle are illustrated in
Figure 5-7
.
