R&D (FilterCavity)
MarcEisenmann - 21:58, Thursday 06 June 2024 (3601)
shg, irmc, mz/grmc recovery

[Logan, Marc]

We checked again SHG scan. Actually, we found that our HOMs were splitted in 2 due to mistuning of the input polarization.

This made our previous mode-matching estimation wrong. Retuning the HWP, we could properly recover the 91% mode-matching. It is not clear why the high order-mode that was spoiling 30% of mode-matching disappeared. Tuning the modulation phase and servo settings we could relock SHG. The DDS1 setting was saved.

We realigned MZ and GRMC and could also lock them without particular issue. Same for IRMC.