I checked the IR mode matching to filter cavity and improved it. The injected BAB was 440uW.
We must check TEM00 power and injected BAB power at the same time to confirm the mode matching.
Mode matching before improvement: 77%
| TEM00 | 410 |
| yaw | 155 |
| pitch | 110 |
| Laguerre | 110 |
| offset | 94 |
Mode matching after improvement: 94%
| TEM00 | 500 |
| pitch | 110 |
| Laguerre | 105 |
| offset | 94 |