[Aritomi, Yuhang]
We checked the nonlinear gain with 25mW green (MZ offset: 4.2), but it is only ~2. It was 6.8 one year ago in elog2577. We optimized green alignment to OPO, OPO temperature, and p pol PLL frequency, but the nonlinear gain is still around 2. Here is the summary of today's measurement.
| green power (mW) | 0 | 25 | 25 | 25 | 25 |
| OPO temperature (kOhm) | 7.166 | 7.166 | 7.156 | 7.146 | 7.136 |
| p pol PLL (MHz) | 295 | 255 | 235 | 220 | 200 |
| BAB maximum (mV) | 98.4 | 216 | 226 | 230 | 232 |
| Nonlinear gain | 1 | 2.2 | 2.3 | 2.3 | 2.4 |