Precision II Operation and Maintenance Manual
C
2-10
996-0255 rev. b
Initial alignment
1) Block rear mirror of the oscillator and then adjust the LNE
(Line Narrowing Etalon) normal to the optical axis so that
the system will lase on the LNE itself. Monitor lasing by
using either an IR card, a photodiode or by observing the
532 nm after the Second Harmonic Crystal.
2) Adjust the LNE in the vertical axis until the system stops
lasing off the LNE.
3) Turn off the Q-switch at the remote box but leave cavity
shutter open.
4) Unblock rear mirror and then check free running thresh-
old by increasing the pump voltage on the flashlamps by
80 volts. There should be no lasing. If lasing is observed,
refer to index of Troubleshooting section of this manual
for the procedure for eliminating free-running.
5) Return the lamp voltage to the normal setting.
6) Proceed with normal operation.
Fine adjustment
1) Perform the initial alignment of the LNE.
2) Using a 10mm etalon, generate Fabry-Perot fringe pattern
in using the 532 nm output of the laser.
3) Using the vertical control of the LNE, make fine adjust-
ments in the position of the etalon to make the Fabry-
Perot rings as distinct as possible.
4) Verify that there has been no change in the free-running
threshold. If the free-running buffer is reduced, refer to
index of Troubleshooting section of this manual for the
procedure for eliminating free-running.
5) Check to make sure that the Fabry-Perot rings are still
distinct, if not, repeat steps 3 and 4.
6) Proceed with normal operation.
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