Chapter Five: Maintenance
© 2019 Cutting Edge Optronics, Inc.
39
Iklwa Laser User Manual
Approved for Public Release; NG19-2099 CEO-UMAN-0055E
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 diode power supply and chiller.
Check the performance with all items set to the values on the laser test report.
The water flow rate and coolant temperature have a significant impact on the
laser performance. Make sure that the flow rate is above 1.4 gpm and the
temperature of the chiller matches results from the original test report.
3.
Peak up the laser power by tuning the temperature of the TEC controller.
Beginning with the TEC Temperature from the ATP Test Report, adjust the
temperature up and down to optimize.
WARNING
. To prevent damaging the HM mirror and LBO crystal, the laser output
power should not decrease more than 10% when adjusting the TEC Temperature.
The phase matching of the SHG crystal is crucial for the Iklwa laser. This is
achieved by setting the proper temperature on the SHG crystal, which is
controlled by the TEC controller.
Figure 5-5
illustrates an example of the dependences of power and pulse-to-pulse
instability of the laser to the SHG crystal temperature. As shown in the example, the mid-
point of the temperature band is around 28.5° C. The laser may have peak power at 29.3°
C in this example, but a small temperature change on the SHG could result in a power
fluctuation.
Figure 5-5. Example of Power Dependence and Pulse-to-Pulse Instability
of the laser to SHG Crystal Temperature
4.
Peak the laser power by increasing the current.
