R&D (FilterCavity)
MarcEisenmann - 23:08, Wednesday 05 June 2024 (3596)
DDS recovery and alignment restart

[Logan, Marc]

Fixed amplifier and clock with kapton tape.

Seems clock and LNVR are quite hot  (no heatsink) maybe the reason for their degradation?

Recabled all DDS connections

SHG alignment : fundamental = 1.6V ; hom = 64+88mV ie 91.3% mode-matching. not sure why the previous spurious HOM diaspeared..

after some tweaking we got kind of similar values so it seems hard to further optimize without moving the matching lens.

IRMC fund = 320mV, hom = 32 + 18mV ie 87% mode-matching after alignment (only acting on lens) funad = 364mV and hom = 24mV ie 94% mode-matching