[Aritomi, Yuhang]

First we put rubber under phase shifter to damp 500Hz resonance. 500Hz resonance almost disappeared with rubber and finally we could lock CC1 with 4kHz bandwidth and CC2 with 1.5kHz bandwidth. CC2 is still a bit unstable and maybe integrator is necessary for CC2.

Then we measured squeezing spectrum, but the spectrum is similar with before... 

Tomorrow we'll measure free running and closed loop phase noise of CC1,2 to estimate phase noise.