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Beamsplitter options, CWS Jan 26 2024
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.
If we send the beam down to a corner cube and back again, that allows for in situ alignment, with a flip-into-beam beamsplitter.
camera:
Camera software:
Flippers:
3/8 inch diameter micrometer mounting is compatible with Thor Labs Piezo PIAK10 actuators
This Newport stage is too. We'd need two in order to steer each beam.
The other alternative is Thor labs small tip-tilt stage
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