Torrey Cullen - posted 12:08, Wednesday 29 November 2023 - last comment - 16:15, Wednesday 29 November 2023(11388)
Filter Cavity
The optical table with the filter cavity remains very clean: 0/0/0 over a 60 second measure.
[Daniel, Torrey]
We have a rough round trip of the cavity aligned. Added a halfwave plate, PBS, and PD as an input power reference. We made a mode matching solution but found that the few inches before the cavity are not allowable to use as a shifting range for the lens as the beam from the round trip of the cavity will not clear the lens. Quick trig says we can't put a lens within 7 inches of the input of the cavity. Will redo this after lunch.
I created a rough MM solution and installed it that puts a waist of ~700 um at M3. Took off M3 and used the profiler to check beam size at this location. My code in finesse says ~605 um is the actual size required, but this will do for now. I also hooked up the EOM and ensured it was working. Installed the curved optic at the M1 location and am ready to try for cavity alignment.