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How are holograms possible? (www.youtube.com)

submitted 1 month ago* (last edited 1 month ago) by [email protected] to c/[email protected]

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3Blue1Brown explains holograms in detail. The physical kind, flat plates that show 3d scenes.

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[–] [email protected] 6 points 1 month ago* (last edited 1 month ago)

Hmm.

You'd think that you could take three exposures, using a red, blue, and green laser, and then use optics to recombine the output to create a color hologram.

But I've never heard of such a thing. I wonder if there's some kind of physical limitation that I can't think of preventing it?

kagis

Nope. Apparently you can do exactly that, and devices do exist to do it:

https://www.litiholo.com/hologram-kits-color.html

First I'd seen of this, though.

EDIT: Ah, late in the video, they actually do show a few color holograms, the most-obvious of which is probably the R2D2 shot, which clearly has both blue and red.