[Sheila, Karmeng]

To align OPO IR beam, we try to lock the IR dither lock at fundamental, but we were unable to see the error signal and dither. CLK_gain were changed from 0.1 to 1000, and the demodulation phase from 245 to 225. The resulting error signal as attached. A 200Hz wide bandpass filter added to the PD input dither around 3kHz, LSC_servo_gain changed from -10 to -300 to lock the OPO.

We also adjusted the beamsplitter (position before the IR camera) to center the IR beam on SQZT7 IR camera.