NORTHROP GRUMMAN Patara EPL-016-QTG Quick Installation Manual

NORTHROP GRUMMAN Patara EPL-016-QTG Quick Installation Manual Manual pdf 33 page image

Chapter Three: Laser Optimization and Tuning© 2019 Cutting Edge Optronics, Inc. 21 Patara End-Pumped Laser Quick Start GuideApproved for Public Release; NG19-19014. Verify that there are no objects in the laser beam path except for the negative lensand power meter.WARNING. Wear proper laser safety eyewear to protect the eyes.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 currentup to slightly above the threshold. Move the negative lens and power meter so thatthe beam is going through the center of the lens and hitting the center of the powermeter.7. Allow the TEC to reach optimum temperature. Gradually increase the current setpoint to the operating current specified in the ATP test report. Don’t touch any partof the laser and wait for the laser to stabilize for thirty minutes (usually the lasertakes around 20 minutes to reach 95% of the maximum power). Then check if thepower is close to the result on the test report.Occasionally the laser needs optimization for the first installation due to the slightdifferences of environments, chiller settings, and transportation vibration.Laser Performance OptimizationOptimization of the laser may be required when the laser is initially installed or the laserperformance has degraded due to aging laser diodes.NOTE: Record optimization data on SVC-FORM-0019 (EPL Optimization Worksheet),which can be found on the Knowledge Center.For this procedure, a green light should be visible from the laser. In the absence of anyvisible 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 thelaser power. Wait for the laser to be thermally stabilized before attempting anyadjustment.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 datasummary. Verify that all of the eDrive settings are correct.