Chapter Five: Maintenance© 2018 Cutting Edge Optronics, Inc. 46 Patara I and II Laser User Manualcurrent to reach 99.5 percent of the peak power. This is the proper operatingcurrent. In this example, the operating current would be 22.9 A.The slight difference between the actual operating current and the test report valuemay be due to the performance difference of the chillers. An increase in theoperating current can compensate for the aging of the Patara laser diodes.Figure 5-5. Example of Laser Performance Dependence on the Operating Current6. Peak up the laser with adjustment of the cavity mirrors.WARNING. Making mirror adjustments can be non-reversible. Do this step only when allthe steps above have been completed and the laser does not meet the specificationswith the correct settings.a. Locate the access holes for high-reflection mirror (HR) and harmonicmirror (HM). Notice the positions of HR and HM mirrors with respect tothe direction of the laser output in Figure 5-6.b. Remove screws from access holes only in a dust free environment.c. Use a 1/8" ball driver to make adjustments. A fine adjustment is a 1 degreeor less rotation. A small adjustment is about a 2° rotation. A coarseadjustment is 15° to 20° rotation. If coarse adjustments are needed toobtain performance, reduce operating current by 2 A. Return to normaloperating current when making small and fine adjustments.d. The screws for the adjustments of the vertical tilt angle and the horizontaltilt angle are illustrated in Figure 5-6.
