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vendor | part # | size | specs | price |
|---|---|---|---|---|
| Newport | 20BC17MB.1 | 50.8 x 50.8 | lambda/4 | $635, stock |
| Edmund | #32-704 | 50.0 x 50.0 | lambda/4 | $539, stock |
| Thor | BS031 | 50.8 x 50.8 | lambda/4 | $564, stock |
Alignment:
CWS Jan 27 2024
If we use bounced-back beam from front face of beamsplitter cube, or else retro-reflected return beam, what displacement corresponds to what angle?
Assume 50 cm distance from cube face to detector. If we want to align to 5 arcmin (size of a Rubin detector) then the angle is 5*60*5e-6 rad = 1.5 mrad.
That is a spot displacement of 1.5E-3*50cm = 7.5 mm. So a detector 10mm on a side would be good for this. Thor labs 126MU camera is 14mm x 10mm.
...
After considerable looking around for an off-the-shelf way to control 6 different tip-tilt platforms, arrived at this from Newport:
Nope- inadequate force from actuators. Didn't order this.
Acronym options
Multi-beam Optical Seeing Sensor- MOSS
Precise Emitter of Aligned Rays - PEAR
Parallel Aligned Ray Projector- PARP
Parallel Photon Projector- P-cubed
Laser Light Aligned Multibeam Apparatus- LLAMA
Feb 3 2024 CWS. Adding another beam expander, adapter hell:
laser diode to beam expander mount, parts ordered Feb 5 2024: 
Moving MOSS to main dome- Sept 2024