nikhil.mukund@LIGO.ORG - posted 15:16, Tuesday 25 July 2023 (71691)
OPO NLG gain & IFO sensitivity
[nikhil, vicky]
We looked at Saturday's corrective maintenance period (see Corey's entry: 71613), where the nonlinear gain of the OPO pump power was varied by changing the OPO ISS set points. NLG gain of close to 80 uW provides the best broadband squeezing. A higher power level seems to degrade the SQZ level and injects extra noise below 40 Hz. Currently, the non-linear gain is set to 50 uW.
| UTC | Dur (s) | ISS Setpoints | Plot label |
Angle-averaged range [SNSL][Mpc] |
| 2023-07-22 20:10:00 | 1200 | - | SQZ Off | 136.8 |
| 2023-07-22 17:30:00 | 1200 | 50 uW | NLG Low | 140.5 |
| 2023-07-22 21:00:00 | 1200 | 80 uW | NLG High | 144.5 |
| 2023-07-22 12:30:00 | 1200 | 90 uW | NLG Highest | 145 |
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