NaokiAritomi - 19:18, Sunday 07 July 2019 (1442)
Further improvement of IR alignment
[Aritomi, Eleonora P&C, Yuhang]
This is work on July 5th.
We scanned green phase at 1kHz and scanned AOM again. The result of AOM scan and TEM00 are attached. With 1kHz green phase scan, TEM00 peak isn't measured properly. After AOM scan, we locked IR on TEM00 and HG01,10 and measured each power with dataviewer.
| AOM frequency (MHz) | IR transmission | mode |
| 109.03643 | 500 - 1200 | TEM00 |
| 109.43154 | 100 - 200 | HG10 |
| 109.43199 | 150 - 400 | HG01 |
Then we tried to improve the alignment of IR. TEM00 and HG10,01 with 10 Hz green phase scan after the alignment is as follows.
| AOM frequeny (MHz) | IR transmission | mode |
| 109.03646 | 100 - 5500 | TEM00 |
| 109.43156 | 100 - 300 | HG10 |
| 109.43204 | 100 - 400 | HG01 |
We haven't measured all the higer order modes, but mode matching should be around 90% now.
Images attached to this report
