[Umran,Torrey]

We are profiling the two beams heading to OFC 2. Took a 60 second cumulative particle count that reads 1/0/0 at the start of the work. Random aside, we noticed on the new set of forks fully tightening the screw does not fully secure an optic. Something to look out for.

We first profile the beam coming out of the collimators, record these waists and waist locations, and use these as inputs for a JAMMT mode matching solutions. Current beam profiles for OFC2 can be found at "C:\Users\torre\Nextcloud\GQuEST\B102\Output Filter Cavities\OFC2\ModeMatching\* Beam profile.ipynb".

Then use JAMMT to calculate the mode matching of the second filter cavity. For now please note that I am using two 1/8 inch spacers to make OFC2 a total of 1/4 inch longer than OFC1. However, including and not including this quarter inch in my calculations for MM yields results that differ by amounts smaller than the precision in this process. JAMMT solutions can be found in the same directory, with screenshots.

I then implemented these solutions, note they differ by location by +/- inch, similar to other solutions. With the lenses in place I re-profiled (numbers in the same notebooks linked above). I can then plug these numbers into my finesse models for the second filter cavity. Attached are the results:775_OFC2_model.png 1550_OFC2_model.png. These calculation both expect having a mode mismatch of <1%. 

Besides alignment, the light should be ready for OFC2. Superoptics most likely tomorrow. End of work particle cound was 1/0/0. 

Other notes: The 1550 light is fairly astigmatic. We fiddled trying to fix this but am unsure where this is coming from. Long term this is a not a problem as this light wont be in the cavity anyways.