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Check Hold Off
Checking hold off is a technique needed to verify proper operation of the laser. To check
hold off, perform the following steps:
1.
Turn on the laser and run for at least 20 minutes.
2.
Lower the pump current to 5 A.
3.
Press EMISSION to stop lasing.
4.
Set the Q-Switch internal trigger (or external gate) mode to External Trigger mode in
the Channel Menu on the eDrive. Ensure there is no input to the external gate BNC
on the rear panel of the eDrive.
5.
Press EMISSION and open the shutter to start lasing.
6.
Gradually increase the current to the full operation current level.
7.
Observe the beam output on the power meter. Hold off condition is met when no
green light is visible or only a few mW.
8.
If significant green power is observed, the laser does not hold off and may need
internal repair.
9.
Reduce the current to 5 A.
10. Press EMISSION to stop lasing.
11. Return the eDrive to internal trigger (or external gate) mode.
12. Press EMISSION and open the shutter to start lasing.
13. Gradually increase the current to the operation current.
Daily Operation
Output energy and repetition rate of the Patara EPL system are adjustable over a wide
range. However, operating protocols must be observed to assure operation without
risking internal damage to optical components.
© 2019 Cutting Edge Optronics, Inc.
Perform the same procedure with the vertical adjustments of the
HR and HM mount.
Periodically check for hold off when making these adjustments
(see Check Hold Off section below).
If laser power is within +/-5% of nominal (typical power meter
accuracy), and it has good beam shape and stability, stop and
replace the access screws in the cover.
If the power is low, check the hold off (see next section).
24
Chapter Three: Laser Optimization and Tuning
Patara End-Pumped Laser Quick Start Guide
Approved for Public Release; NG19-1901
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