[Aritomi, Yuhang, Marco]
We found optimal temperature region which doesn't have mode hopping for three lasers and has beat note with 7 MHz for ML-CC PLL and below 400 MHz for ML-p pol PLL and overlapping of CC and p pol inside OPO.
Current (A) | Temperature (deg) | |
Main Laser | 1.834 | 23.12 |
CC | 1.183 | 38.18 |
P pol | 1.338 | 32.43 |
P pol beat note when CC and p pol is overlapping inside OPO is 69.8 MHz without green.
With green power of 68 mW, p pol overlapping beat note is around 7 MHz. The laser setting is as follows.
Current (A) | Temperature (deg) | |
Main Laser | 1.834 | 23.12 |
CC | 1.183 | 38.1 |
P pol | 1.338 | 32.41 |
We have to lock p pol at p pol beat frequency +- 7 MHz, so p pol beat note around 7 MHz is not good. To change the p pol beat frequency, we changed OPO temperature from 7.05 kOhm to 7.02 kOhm. The p pol beat frequency became 56 MHz.