Nishino,

2024.12.04

See

LockAqu/DataLogger.ipynb

Noise2/DataLogger2.ipynb

Fig.1 shows lock acquisition process. IR and GR are phase-locked. First, the main IR is locked to the main cavity. Second, by changing voltage to the piezo on PCM, one finds the optimal position of the PCM which realizes speed meter. Third, by changing the local oscillator frequency for PLL, one makes the fundamental mode of the GR laser resonate in the PCC. Finally, by turning on the loop, the PCC is locked.

Fig.2 shows the IR transmission, which is the interference of the first and second circulation light. This reflects the fluctuation of the PCC length for the IR. Red and blue are the ASD when turning the PCC locking on and off.