daniel.sigg@LIGO.ORG - posted 16:26, Friday 31 January 2020 (54834)
CLF power levels
Trending the CLF REFL PD and IR PDs, we can deduce the CLF transmission through the OPO. The OPO IR PD is installed after a 50:50 beampsplitter, so it should see half the power of the squeezer path, when the beam diverter is closed.
| CLF REFL (µW) | IR PD (µW) | sqz path (µW) | Throughput (%) | |
|---|---|---|---|---|
| High power | 120 | 2.75 | 5.5 | 4.6 |
| Medium power | 54 | 1.25 | 2.5 | 4.6 |
Our best LO sensing noise was measured with the 120µW CLF at 1.0×10–6 rad/√Hz, with a CLF sensing noise at 3.7×10–6 rad/√Hz.
Images attached to this report
