Figure 5-6. Accessible Holes For Hr And Hm Cavity Mirror Adjustment - NORTHROP GRUMMAN Patara I User Manual

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Figure 5-6. Accessible Holes for HR and HM Cavity Mirror Adjustment

e. Optimize power:
 Make small adjustments to the horizontal angle of HM mirror and
observe the output power.
 Once a maximum is found, adjust the vertical control of HM mirror to
maximize power.
 Make small adjustments to the horizontal angle of HR mirror and
observe the output power.
 Once a maximum is found, adjust the vertical control of HR mirror to
maximize power.
 Repeat the optimization steps with both the HR and HM until there is
no significant performance improvement.
 If Laser is still not within 5% of the original power or not stable,
repeat the steps of TEC optimization, eDrive current optimization, and
HM, HR adjustment until there is no significant performance
improvement.
 If the laser power can't be restored to the specification, or the laser is
not stable, then the "walking the cavity" procedure can be tried.
Walking the cavity is sometimes required to optimize the laser and
involves combining mirror mount and SHG crystal temperature
adjustments.
 Reduce current by 2 A while making coarse adjustments. Return
current to normal when making fine adjustments.
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Chapter Five: Maintenance
Patara I and II Laser User Manual