Having made quite a few holograms myself over the years, I can see some problems with this. Without the large mass of a regular optical bench these can be very sensitive. Also,, the mass distribution across your optical bench can make the surface not level. I have used HeNe lasers mostly for my holography projects, but there can also be argon single line as well. These sometimes weigh a not negligible amount. My guess here is that the old fashioned way of doing this is still the best.
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Would it work, what do you think?
Another question - has anyone tried to attach a gimbal to a laser to avoid shaking of the spot at large distances as it is usually done to stabilize drone cameras?
Very cool project. I am also amateur holographer. Your basement floor is a good start. I think you will have better luck when you switch to the steel table with more mass and less thermal sensitivity. A quality laser beam is an absolute must. There are a few diodes out there that are suitable, including the green PL530 OPSL.
I noticed you mentioned $15.00 per plate. Check out the Integraf website https://www.integraf.com/
Transmission type holograms are much easier to make than reflection type... maybe a good place to start to work the kinks out of your set up.
My table is 500 lbs concrete that floats on 4 partially inflated tractor tire innertubes.
I look forward to updates on your progress.