Comments on: Recording a hologram in a wet emulsion

By: jeff blyth

jeff blyth — Wed, 10 Nov 2010 12:53:32 +0000

That is indeed interesting Kaveh. So would shooting the plate with just the right amount of preswelling using a specific water/alcohol mix, then allow with the dried plate a good edge-lit replay hologram?

By: Henry Nebrensky

Henry Nebrensky — Wed, 01 Jul 2009 19:40:46 +0000

oops – I didn’t see you’d already suggested this on the other forum – didn’t realise there were two pages, duh.

I’ve found an ancient sketch of something similar I did years ago at
http://people.brunel.ac.uk/~eesrjjn/masstran/cdg/masstind.html

It was easier to contact the prism semi-permanently to a thin sheet
of glass (with something like Canada balsam) and mount that, rather
than trying to work with a discrete prism.

By: Henry Nebrensky

Henry Nebrensky — Wed, 01 Jul 2009 10:45:32 +0000

One way to get a larger beam angle inside the emulsion would be to contact a prism against it and illuminate through that – need a collimated reference beam though.

But I’m not sure that helps much as you just end up messing about with matching fluids at replay time instead of recording time…

By: J. Burns

J. Burns — Tue, 16 Jun 2009 20:14:22 +0000

Everyone in the field would benefit from your clear explanations including me. You’ve forgotten more about holography than I ever learned! I look forward to more!

By: Kaveh

Kaveh — Tue, 16 Jun 2009 19:42:24 +0000

I am flattered that someone as knowledgeable as yourself is suggesting I do more of these! Your wish is my command, Jody. I would really like to do more of these. I feel it’s my duty to pass on whatever I have learned to the next generation of hologrphers…

By: J. Burns

J. Burns — Tue, 16 Jun 2009 18:43:08 +0000

Great explanation! I think Steve Benton was a fan of an offset object in order to have the fringes more perpendicular in the emulsion, thus reducing the side effects of emulsion shrinkage on the fringes. Even dry/wet/dry processing (silver halide gelatin emulsions) allegedly causes some emulsion shrinkage changing the fringe angle & affecting efficiency and accurate pseudocolor recording at the desired viewing angle/distance.

Now that you’ve teased us with this short presentation, when can we expect more detail including reflection/volume holos and maybe some simple equations and recommendations?
Thank you!

By: Colin Kaminski

Colin Kaminski — Sat, 13 Jun 2009 01:31:23 +0000

Thank you Kaveh, a great presentation.

By: Justin W

Justin W — Fri, 12 Jun 2009 19:16:37 +0000

Absolutely super presentation, Kaveh!