Eleonora (remote) and Yuhang

We found GR_tra becomes very stable after engaging AA/pointing/z_corr loops. Before checking FDS, the BAB was tested today. This kind of test was done long time ago (elog2049), we bascially follow the same method.

1. I put BAB on resonance. However, I notice later that PLL was unstable and unlocked at some point. Apart from that, the IR transmission and detuning was stable.

The second trend and minute trend data is shown in the attached figure 1 and 2.

We could see that GR_tra was not stable, which is due to SHG is not stable at the beginning.

The calibration is done with the method in elog2035, the calibration is shown in attached figure 3.

2. I put BAB in a detuned case. The second trend and minute trend data is shown in attached figure 4 and 5.

We could see that both IR_tra and IR_demo are stable in the detuned case.