R&D (FilterCavity)
MarcEisenmann - 10:43, Monday 01 July 2024 (3629)
p-pol pll recovery

[Logan, Marc]

We started with some issues to see the beatnote signal that was fluctuating and disappearing randomly. Some monitoring cables were cutting the main laser beam and this issue was resolved after moving them.

We recovered about 20% mode-matching for each beam.

We  could not change the DDS3 DAC1 frequency. What is surprising is that it can change when reloading a new config but not when just loading new frequency in an existing frequency.

We moved p-pol pll lo to DAC0 that is working properly.

To achive the lock, we had to change the phase detector polarity to negative as saved in the latest config file