After having a better matching of homodyne, we tried to measure the squeezing level before the golden week. However, we failed because of misalignment of homodyne. Besides, we also changed green power to 40mW.

We have a better squeezing level, which is 4.4dB.

We can also see we have two main peaks in this plot. One is around 9kHz and the other is around 20kHz.