Yuhang, Eleonora
We check the power at different points on the bench and compared with nominal values. We only had to realign IRMC. After re-alignment its trasmission is above 80% (much larger than GRMC)
Here the current values for reference:
| GR power before green EOM | 280mW |
| GR power before AOM | 51 mW |
| GR power before MZ | 220mW |
| GR power after AOM | 16 mW |
| GR before GRMC | 48 mW |
| GR after GRMC | 93 mW |
| GR into the viewport | 14mW |
| GR pump before entering OPO | 19 mW |
| IR power before IRMC | 2.2mW |
| IRMC transmission | 1.8mW |
Then we adjust the setup to measure FIS. We recovered the alignment of homodyne and measured the squeezing, finding values similar as before (~ 6 dB). Plots will be updated soon. We remarked that the CC1 loop is not stable and keeps unlocking. We plan to repace soon the GR phase shifter, hoping this will impove the situation.
We also checked the alignement of BAB into FC. It was still fairly good.