NAOJ GW Elog Logbook 3.2
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NaokiAritomi - 16:54, Wednesday 19 May 2021 (2514)
CCFC with 20mW pump green
[Aritomi, Michael]
This work is done on 20210518.
We decreased the pump green power from 40mW to 20mW for CCFC. First, we checked the nonlinear gain with 20mW green.
| green power (mW) | BAB maximum (V) | OPO temperature (kOhm) | p pol PLL (MHz) |
| 0 | 0.656 | 7.164 | 245 |
| 20 | 3.28 | 7.164 | 190 |
The measured nonlinear gain is 5 with 20mW green. When we assume the OPO threshold is 80.6mW, the theoretical nonlinear gain is 4. It seems that the OPO threshold is lower than 80.6mW now.
Then we measured CCFC error signal and locking accuracy (Fig 1,2). The CCFC calibration amplitude is 182mVpp.
Images attached to this report
