[Aritomi, Yuhang]
We measured mode matching when filter cavity is aligned with pitch dithering. The result is as follows. Mode matching was around 90%. We found that when pitch dithering was engaged, pitch misalignment became less, but yaw misalignment became more.
Mode | AOM frequency (MHz) | IR transmission |
TEM00 | 109.03607 | 3000 |
HG10 | 109.43128 | 350 |
HG01 | 109.43219 | 200 |
IG02 | 109.8288 | 115 |
offset | 94 |
IR TEM00 transmission was fluctuating even when dithering was engaged (attached movie). Time scale of the movie is 2s and DC offset is 94.
We measured BAB reflection when BAB is on/off resonance. Off resonance reflectivity is 82% and the reflection might be still cutted.