enter Wed Jan 27 09:11:13 2021
Facilities mentioned to Paco yesterday that they'd return this morning to complete repairs on the HVAC. I missed him at 9, but around 1pm, Modesto from facilities stopped by to check the air temperature. He measures 63 F at the lab's air intake, and 72 F near the electronics rack. He's checking on our upstream filters to ensure we're getting clean air. Also mentioned that our temperature is centrally controlled, not by the thermostat in the lab -- I was a little confused by this, but sounds like we'll have to contact them to change the temperature. The lab is comfortable for now
I'm plotting the three beat note spectra I took Monday them with the help of ctn-scripts. After fixing some improperly set conda permissions on spirou, I didn't untangle its package mess before needing to leave. I've grabbed the files to finish up later.
I'm putting together a Thorlabs order for cable management and fiber optomechanics -- mounts for our fiber splitters and other pigtailed components.
In the meantime, I'm rearranging the electronics rack and cables for increased sanity.
The 40m uses these fixed focus collimators (F220APC-1064) in a locking kinematic mount (K6XS) for their fiber launch. Thorlabs also offers similar fixed-focus collimators in 'large beam' (7mm waist for 1550nm) and 'low aberration' varieties. It looks like the triplet lens, low aberration variety uses a slightly different mounting adapter (unthreaded c-clamp, compared with the threaded adapter for F220APC). Thorlabs suggests using epoxy for 'stacked threaded' systems where the internal and external bores both have threads, to avoid inadvertedly loosening one set of threads.
I'm inclined to go with the low aberration version, either T18APC-1550 (3.33 mm waist) or T12APC-1550 (2.27 mm waist). There are also versions of the same with 4.65 and 1.12 mm waist.
exit Wed Jan 27 15:18:12 2021