[Aritomi, Yuhang]
We checked nonlinear gain with 56mW green and found that the nonlinear gain is below 20 while the theoretical nonlinear gain is 37.5. So we optimized the nonlinear gain. We measured OPO transmission of BAB with power meter (power meter range: 8.8 mW) while OPO and green phase is scanned.
| green power (mW) | OPO temperature (kOhm) | p pol PLL (MHz) | BAB transmission (V) | nonlinear gain |
| 0 | 7.18 | 270 | 0.0456 | 1 |
| 56 | 7.18 | 127.5 | 1.42 | 31.1 |
Then we measured FDS, but we couldn't find any squeezing with 56mW green. We decided to reduce the green power to 41.5mW (MZ offset 4.5). We optimized OPO temperature and p pol PLL for 41.5mW green. The nonlinear gain is 13.4 and consistent with theoretical value which is 12.8.
| green power (mW) | OPO temperature (kOhm) | p pol PLL (MHz) | BAB transmission (V) | nonlinear gain |
| 0 | 7.164 | 240 | 0.0456 | 1 |
| 41.5 | 7.164 | 135 | 0.612 | 13.4 |