...
For an estimate of spot size (very, very crude - based on the above notebook, but I apparently failed at focusing even just on the fiber so take this with a grain of salt): spot size = 40 pixels (by eye this is an overestimate) * 5.25 um = 210 um. With an 800 mm lens that corresponds to an angle of .21/800 = .26 mrads. If we're 3 or 4 meters away that's (say 4): ~1mm. Huh. That is definitely not what I observed as a spot size...
Things built in shop:
Version for photodiode holder: 9/27/2023 Photodiode_holder_design.pptx
9/27/2023 sent this to shop: pinhole_holder_2 v6.step
Items that have been built in the shop: Rail_Connector.step Tube_End.step Tube_End_Drawing.pdf Rail_connector_drawing v3.pdf CBP_Calibration_Tube_end_drawing v3.pdf