Naoki, Vicky

We measured NLG with seed. The measured NLG is 12.78, which corresponds to generated squeezing of 15.8 dB. The NLG calculator gives 12.64 so the calibration on February 3 is still OK.

Seed without pump: 0.00078
Seed with pump: 0.00997
NLG: 12.78

How to measure NLG

• request SQZ MANAGER guardian to NO SQUEEZING
• request CLF and OPO guardian to DOWN
• request FC guardian to DOWN or MISALIGNED to avoid the seed resonance in FC
• close pump and push the Toggle Seed/CLF button to switch from CLF to seed
• scan OPO PZT1 by pushing the scan enable button. The OPO seed trans channel is H1:SQZ-OPO_IR_PD_LF_OUT_DQ. Measure the seed peak height
• stop the scan and request OPO guardian to LOCKED CLF DUAL 
• push the Toggle Seed/CLF button to switch from CLF to seed, and measure the seed peak height
• after the measurement, push the Toggle Seed/CLF button to switch from seed to CLF, and request SQZ MANAGER guardian to SQZ READY IFO or FDS