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YuhangZhao - 01:36, Wednesday 15 May 2019 (1351)Get code to link to this report
Found power fluctuation and Necessary to install the second FI for main laser

Chien-ming, Yu-hang, and Aritomi

Today we found power fluctuation after we lock IRMC. Then we did lots of investigation. Especially we put power meter at some position to monitor laser power coming from the main laser. However, as we found before, we didn't see power fluctuation from it.

However, later we used photodetector directly monitor the part of the beam from the main laser. The signal from PD is shown in the attached figure. We could see a clear signal fluctuation.

Then we blocked the light going to SHG, and this power fluctuation disappears.

This proves that it is really necessary to install the second FI for the main laser.

Images attached to this report
1351_20190514183556_wechatimg423.jpeg 1351_20190514183603_wechatimg425.jpeg 1351_20190514183610_wechatimg424.jpeg