NaokiAritomi - 22:40, Thursday 13 August 2020 (2167)
Check of QPD1,2 optimal demodulation phase and WFS1 rotation phase
[Aritomi, Yuhang]
Yesterday we optimized QPD1,2 demodulation phase and WFS1 rotation phase. Today we checked them if they change from yesterday or not. WFS1,2 signals for INPUT PIT measured today is shown in the attached picture. For WFS1, I and Q decoupling is fine, but it is not good for WFS2. Also there are pitch and yaw coupling for both WFS1 and WFS2. We need also WFS2 pitch and yaw rotation.
We optimized WFS2 demodulation phase by DGS. WFS2 DGS demodulation seems working. Optimal WFS2 demodulation phase is 10 deg while it was 0 deg yesterday.
| WFS2 DGS demod (deg) | WFS2_I_PIT | WFS2_Q_PIT |
| 0 | 0.2 | 0.07 |
| 10 | 0.31 | 0.02 |
| 20 | 0.3 | 0.05 |
We optimized pitch and yaw WFS1 rotation. WFS1 pit and yaw rotation phase is now 20 deg while it was 10 deg yesterday.
| WFS1 rotation (deg) | WFS1_I_PIT | WFS1_I_YAW |
| 0 | 0.46 | 0.17 |
| 10 | 0.51 | 0.08 |
| 20 | 0.45 | 0.02 |
Images attached to this report
