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This is from R.R.A. Syms "Practical Volume Holography" (Oxford Engineering Scientific Series), Oxford Science Publications, 1990, page 184: "Even for weakly modulated gratings, coupled wave theory predicts a considerable difference in diffraction efficiency between the two possible re...

How much do you want? Are you able to mount it to glass plates yourself?

Don't you think it would be easier to wiggle the mirror? Either way, I think you'd smear objective speckle but not affect subjective speckle which happens during reconstruction.

Happy to hear of someone wanting to do new holography, but unfortunately it will be difficult to set up a studio to do as you describe. Jeff Weil in Florida was the last independent holographer shooting masters for embossed holograms in the states, and he's now retired. Those who may still sell embo...

I'd recommend a KI in water bath before the drying steps. You're replacing the bromide as Dinesh mentions, and that won't be affected by the subsequent graded alcohol baths. All the alcohol baths do is dissolve the water out of the emulsion, and replace it with a faster evaporating liquid. There's r...

I'm happy to announce that this exhibit will be extended for the next year at least. I have to say the combination of holograms with old lasers really seems to work well, though they tend to steal the show amongst the general public. But that's fine with me!

A podcast discussing my collection and exhibit is now available here: https://www.photonics.com/Podcast/pce46?refer=picks

Din wrote: ↑Sun Jan 23, 2022 10:25 am Fresnel reflection need to be considered, since such reflection diminish the actual radiation entering the plate.

Yeah, I forgot about that. But beam ratio is usually bracketed too, so it doesn't really matter.

Squeege after the fotoflo?

Use the detector perpendicular to the beams when measuring to calculate beam ratio. Beam ratio is independent of the orientation of a recording plate, as it determines the fringe visibility in space. Use it parallel to the recording plane when calculating exposure if you like. Since exposure is usua...