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Message ID: 1637     Entry time: Wed Jun 1 18:43:09 2016
 Author: awade Type: DailyProgress Category: Laser Subject: Calibration of laser head power

I put a thorlabs power meter (S130C) to see what the actual output of the south laser (M126N-1064-500) was. I expected 500 mW, but the power was turned down to about 184 mW. The power indicated on the laser controler was 308 mW.  After playing around it seems that you can set the calibration point for the laser head.  Error on ThorLabs heads is ussuallaly about $\pm7\%$ so not brilliant, but I adjusted the set calibration point down to match what the power meter was actually measuring at the ouput.  Hopefully this means the head better reports the power.

Let me know if there is a reason for this offset and I can change it back.

-AW Wed Jun 1 18:42:29 2016

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