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4.
Verify that there are no objects in the laser beam path except for the negative lens
and power meter.
5. Once all the parameters are set correctly, and temperature of the chiller is stabilized,
set the current to 5 A and press the EMISSION button.
6.
Press the SHUTTER button to open the laser shutter. Gradually increase the current
up to slightly above the threshold. Move the negative lens and power meter so that
the beam is going through the center of the lens and hitting the center of the power
meter.
7.
Allow the TEC to reach optimum temperature. Gradually increase the current set
point to the operating current specified in the ATP test report. Don't touch any part
of the laser and wait for the laser to stabilize for thirty minutes (usually the laser
takes around 20 minutes to reach 95% of the maximum power). Then check if the
power is close to the result on the test report.
Occasionally the laser needs optimization for the first installation due to the slight
differences of environments, chiller settings, and transportation vibration.
Laser Performance Optimization
Optimization of the laser may be required when the laser is initially installed or the laser
performance has degraded due to aging laser diodes.
NOTE:
which can be found on the Knowledge Center.
For this procedure, a green light should be visible from the laser. In the absence of any
visible output, contact Northrop Grumman for assistance. To obtain the best performance,
small adjustments may optimize the laser. To optimize the laser, follow these steps:
1. Wait for the laser to reach thermal stabilization.
Both the laser bench temperature and environmental temperature significantly impact the
laser power. Wait for the laser to be thermally stabilized before attempting any
adjustment.
2.
Check the settings of the eDrive and chiller.
Check the performance with all items set to the values on the laser ATP test report data
summary. Verify that all of the eDrive settings are correct.
© 2019 Cutting Edge Optronics, Inc.
WARNING.
Wear proper laser safety eyewear to protect the eyes.
Record optimization data on SVC-FORM-0019 (EPL Optimization Worksheet),
Chapter Three: Laser Optimization and Tuning
21
Patara End-Pumped Laser Quick Start Guide
Approved for Public Release; NG19-1901
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