Sheila, Haocun

We tried to inject squeezing CLF into the main IFO, and we saw some squeezing+anti-squeezing floating around.

• We did the squeezing beam alignment yesterday, and it seems the alignment was still good enough today.
• To get the 3MHz OMC Demod signal, we tuned the squeezer laser frequency to change the sign of the Beatnote (Laser temperature changed from 25.59 to 25.62). Current Temp Polarity setting on TTFSS: Negative with Beat note error signal; Positive with PZT Frequency.

I retrieved the DARM spectrum (GPS time: 1227658712 to 1227659075 and then the interferometer lose lock.), and the estimated anti-squeezing level is >~10dB? (Pink curve as reference with the beam diverter closed.) 

The loss is hard to tell, but a conservative estimation of 75%~80% is reasonable. With green power input ~16.5mW and NLG ~6. We should get 11dB anti-squeezing and ~4dB squeezing, which agrees with the quantum effects we saw.