Tested the laser power through the fiber chain (90 ft out of vac fiber cable -->feedthrough-->in vac splitter) using a Ophir power meter. The measurements were taken by orienting the fiber to shine into the power meter.
Directly from laser: ~19.8-20mW, at max 21.5mW
After 90ft fiber: ~17.5-18.2mW, at max 19.56mW
After the feedthrough: ~14.8mW, at max 15.7mW
After Splitter: ~5.6mW or 4.86mW depending on which side of spliter, at max 5.9mW
Note that the measurements taken after the splitter might be a bit low because the angle of the power meter wasn't the best, I'll re-measure it tomorrow.
I've gotten the fiber mircoscope from Jeff, so I'll check the fiber core of the feedthrough and the splitter and post photos
Tomorrow I'll hook up the splitter to each of the HoQI and see if the fringe visability is the same when in the fiber chain as when getting light directly from the laser.
One of the nuts holding HoQI SN005 was slightly loose and the HoQI was slightly unaligned.
I re-aligned it, but it was extremely difficult to do with the light from the splitter for whatever reason so I ended up aligning it with the fiber from the feedthrough, and switching it the splitter to get fringe visibility measurements.
Fringe Visibility:
001-SN005: SIN-82.42%, COS-75.71%, MCOS-77.78%
002-SN007: SIN-80.0%, COS-70.73%, MCOS-77.78%
Compared to the fringe visibility from before the splitter:
001-SN005: SIN-83%-->82.42%, COS-75%-->75.71%, MCOS-83%-->77.78%
002-SN007: SIN-82%-->80.0%, COS-80%-->70.73%, MCOS-82%-->77.78%