cheryl.vorvick@LIGO.ORG - posted 17:54, Tuesday 29 May 2018 - last comment - 14:41, Wednesday 30 May 2018(42220)
IO path on the PSL: EOM PD restored, IO GigE camera 2 installed, IMC IN PD recalibrated
EOM PD restored:
- the Thorlabs PD that was originally installed on the EOM pick off path, has been restored to this location
- it was replaced by the ISS PD for a while, but the ISS PD is back in the ISS box
- this Thorlabs PD will be replaced with a large area PD
IO GigE camera 2 installed:
- IO_AB_M12 was swapped, the super polished mirror removed, and a 98% beam splitter installe
- at 7.6W incident on the bottom periscope mirror, there is 6uW on the camera
- since this camera is downstream of the rotation stage, it's SUM will vary as IMC INPUT power varies
- I've set the gain to 1850
- when the IMC IN power is 20W, the camera 2 gain will, in theory, produce a SUM of around 2.7e8, and closely match camera 1's SUM
- camera 1 incident power is 15uW, with the PMC transmitted power of 42.2W
- camera 2 incident power is 6uW, with 7.6W incident on the bottom periscope mirror
IMC power recalibrated:
- before any recalibration, measured the power before the bottom periscope mirror was 7.6W, with a requested power on the rotation stage of 6.9W
- Keita recalibrated the IMC IN PD
- his notes are attached, as a snapshot
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Comments related to this report
H1:IMC-PWR_IN-GAIN and H1:IMC-PWR_DC_IN gain were moved to FM10 of corresponding filter. For some reason these used to have different calibration, but after folding in the new gains the calibration became the same.
STILL TO DO: measure the power in the main beam, downstream of the EOM, to verify the calibration of the EOM pickoff beam PD