Search found 549 matches

by Din
Fri Nov 07, 2025 2:34 pm
Forum: Optics
Topic: Litiholo hologram disorted?!
Replies: 1
Views: 466

Re: Litiholo hologram disorted?!

Hi everyone, i have a problem with disortion in reflection holograms. When the object extends to the back the parts which are more far away from the film get disorted. The object becomes bigger with distance. IMG_4079.jpg It's hard to see on camera. This happens when i view the hologram by sun and ...
by Din
Sun Oct 26, 2025 4:32 pm
Forum: General Holography
Topic: Multiplex holography viewing analysis?
Replies: 5
Views: 1387

Re: Multiplex holography viewing analysis?

Also, an odd one. I remember being in the audience when this was presented. He created an algorithm that arragned the pits on a CD-R to display a holographic image.
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by Din
Sun Oct 26, 2025 4:27 pm
Forum: General Holography
Topic: Multiplex holography viewing analysis?
Replies: 5
Views: 1387

Re: Multiplex holography viewing analysis?

Hi Jody,
I found my papers, or rather, Joy found them. At any rate, I couldn't find any papers relating to eye position and slit sizes.

But I did find a couple that may be of inrterest to you
double_paper.jpg
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by Din
Fri Oct 24, 2025 12:41 pm
Forum: General Holography
Topic: Multiplex Holograms
Replies: 4
Views: 543

Re: Multiplex Holograms

Hello all :) I would also appreciate any help in bringing this medium closer to my use, whether that be demystification or practical pointers... I don't have the fattest wallet, but I would be very interested in commissioning this type of work from someone, too. Looking forward to hearing back abou...
by Din
Sun Oct 12, 2025 2:23 pm
Forum: General Holography
Topic: which side should the emulsion face?
Replies: 11
Views: 2367

Re: which side should the emulsion face?

But reflectivity at 65 deg is barely above 2% - 3%. You should not be getting any significant woodgrain with a reflectivity that low.
pol_reflectivity.jpg
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by Din
Sat Oct 11, 2025 8:49 am
Forum: General Holography
Topic: which side should the emulsion face?
Replies: 11
Views: 2367

Re: which side should the emulsion face?

If you're getting woodgrain, it suggests that you're at S polarisation, not P. One way to find out is to use a plain glass plate, and have the ref reflect off the glass plate. Start by orienting the glass plate so reflection is at normal incidence, then slowly rotate the glass plate in the plane of ...
by Din
Fri Sep 26, 2025 12:15 pm
Forum: General Holography
Topic: which side should the emulsion face?
Replies: 11
Views: 2367

Re: which side should the emulsion face?

I have an issue with a reflection hologram setup in which the angle of the reference beam is quite large: I am using silver halide film, with a TAC base, laminated onto glass. The reference beam angle is 65deg to the plate normal, linearly polarized, p-polarized orientation (ie. to minimize surface...
by Din
Thu Sep 25, 2025 12:35 pm
Forum: General Holography
Topic: Meta AR glasses
Replies: 4
Views: 1240

Re: Meta AR glasses

As I see it, there's a neural net controlling the input angle, which is interesting. I assume the lens is not holographic (it's not easy to create a large angle holographic angle, as I can attest!). Their lens is certainly impressive. But, I'm a bit confused by their statement: "...our couplers...
by Din
Wed Sep 24, 2025 12:14 pm
Forum: General Holography
Topic: Meta AR glasses
Replies: 4
Views: 1240

Re: Meta AR glasses

Yes, essentially it's the same design we've all been using for two decades; in fact, even earlier since some of the designs are similar to the Air Force Heads Up Display (HUD) from the 1980's. The problem is that you do get noise and double imaging, and a narrow field of view; although the narrow fi...
by Din
Tue Sep 23, 2025 12:14 pm
Forum: General Holography
Topic: Multiplex holography viewing analysis?
Replies: 5
Views: 1387

Re: Multiplex holography viewing analysis?

\Maybe Lloyd Huff and his research partner in Dayton OH may have done some such analysis but I haven’t been able to locate any papers of theirs discussing this and they’re not around to ask. Here you go. Sorry the abstract got cut off, but the book is a collection of papers put together and edited ...