Nishino

2024.10.30 (see GROLTF_sub/OLTF.ipynb)

I characterized the GR locking loop. UGF is 1.4 kHz with the phase margin of ~80 degrees.

Figures:

1) Open loop transfer function (G)

2) Filters of SR560, Moku PID controller,  and PZT driver (F)

3) G/F=AH, A: PZT actuator efficiency, H: optical gain

4) Settings of SR560

5) Settings of Moku PID controller.