Output Power Control - NORTHROP GRUMMAN Patara I User Manual

Shut Down Procedure

Output Power Control

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2. Resume operation by pressing SHUTTER again. The laser will resume
operation with no audible warning. The EMISSION and LASER ON
indicators will become steady. The laser will automatically ramp the current to
the set point with the preset slew rate.
1. Press SHUTTER key to stop lasing.
2. Press EMISSION on the eDrive. The laser diodes cease emission.
3. Press POWER on the eDrive and hold for 5 seconds until display turns dark.
4. Turn the eDrive power enable key switch to OFF. Let chiller run for 1 to 2
minutes.
5. Turn off chiller.
Please refer to the separate Operation and Maintenance Manual for the eDrive for
detailed operating instructions.
Every laser application requires specific laser power settings for the best results.
In some cases, the output power has to be changed at different stages even in the
same laser process. Typically, the output power of a laser can be varied by
changing the operating current. However, the active laser crystals can exhibit
strong thermal lensing, which is related to the operating current. Variation of the
operating current results in the change of the thermal lensing. Therefore, the
position of the focal point moves as the pump current is varied. This is not
desirable for most laser applications especially laser micro-machining.
The output power of Patara laser can be changed either by changing the operating
current or by changing the Q-switch power. This unique, patented technology
allows users to adjust the laser output power continuously without changing the
operating current. The focal point is kept at the same position regardless of the
power level. This feature is very useful for precision micro-machining requiring
different power levels to complete the process.
Chapter Four: Installation and Operation
37 Patara I and II Laser User Manual