Geola question

Holography related topics.
Wackhaus
Posts: 40
Joined: Sat Feb 13, 2016 3:45 pm

Geola question

Post by Wackhaus »

Hi, so I believe it was last summer, that geola had an artist at the Holocenter exhibit, with a technology I hadn't seen before that could be built with something like unity or 3d studio max if I recall, and then sent in for a print of that type to be made and mailed back to you.
Can someone forward me information on this again?
Thanks :)
pocket full of holograms
Nnnn
Posts: 39
Joined: Tue Nov 06, 2018 3:23 am

Re: Geola question

Post by Nnnn »

Hey, I believe this is the service you're referring to:
https://geola.com/product/digital-holography-ilumogram/

Ultimate Holography is also doing something somewhat similar with their Chimera series.
https://www.ultimate-holography.com/chimera
dannybee
Posts: 642
Joined: Tue Jan 06, 2015 10:29 pm
Location: visalia
Contact:

Re: Geola question

Post by dannybee »

Has anyone test this with the 640nm laser diode? What seem to be happening is the dye they use is for 632nm hene laser, and it blocks most of the 640nm light, so I thinking the 640nm is not good for geola polymer any ideas? It works find with a hene.any ideas would help
jrburns47
Posts: 165
Joined: Mon Sep 14, 2015 2:48 pm
Location: Oyster Bay, NY

Re: Geola question

Post by jrburns47 »

Geola is selling Bayer/Covestro panchromatic HX200 photopolymer. Don’t know if they’re also selling some other photopolymer as well... if you’re referring to HX200, it’s definitely sensitive at 640nm. I’ll leave it to you to research online😊.
dannybee
Posts: 642
Joined: Tue Jan 06, 2015 10:29 pm
Location: visalia
Contact:

Re: Geola question

Post by dannybee »

according to the transmission of the polymer in 640nm is much less transmission than a hene, so that the problem with that 640nm it needs more light to go through the dye for a reflection, it would be ok for a transmission but a bit low for a reflection. if this is the same stuff as liti they probably have the red diode closer to the plate. but with hene it allows enough light to go through the polymer
lobaz
Posts: 280
Joined: Mon Jan 12, 2015 6:08 am
Location: Pilsen, Czech Republic

Re: Geola question

Post by lobaz »

One more thing to consider: photopolymer requires at least threshold irradiance [mW/cm2] in order to record anything. If yoour diode is weak, making the exposure longer does not help. (Contrary to silver halide, where you can usually compensate weak laser by longer exposure.) I did not test HX200 at 640 nm, but it should work.
Din
Posts: 402
Joined: Thu Mar 12, 2015 4:47 pm

Re: Geola question

Post by Din »

There are two ways of checking your theory that the dyes in the film are more absorptive at 640nm:

1. Record a grating on silver halide film with the diode. This will eliminate the laser itself.

2. Record a grating on silver halide, simultaneously behind a sheet of the polymer. But, be sure you use the same exposure you would have used on the silver halide alone. If you're right that the dyes are absorptive at 640nm, then insufficient light will get to the silver halide film behind the polymer, and the resulting hologram (on silver, remember) will be weak or non-existent.
dannybee
Posts: 642
Joined: Tue Jan 06, 2015 10:29 pm
Location: visalia
Contact:

Re: Geola question

Post by dannybee »

Thanks Dinesh you could also do this by measuring the intensity of the light going through and comparing it to the light coming in right?
dannybee
Posts: 642
Joined: Tue Jan 06, 2015 10:29 pm
Location: visalia
Contact:

Re: Geola question

Post by dannybee »

Thanks Dinesh you could also do this by measuring the intensity of the light going through and comparing it to the light coming in right? My hene is 18mw and my 640 diode is 25mw spread to about 5x7 at the plate film is a 4x4 .. this setup works fine with the hene & and the 532nm. ... a nice even spread of yellow , and like lobaz said maybe a 640nm and this amount of spread of red light is not meeting the required amount because of the transmission curve of this polymer ji
dannybee
Posts: 642
Joined: Tue Jan 06, 2015 10:29 pm
Location: visalia
Contact:

Re: Geola question

Post by dannybee »

Thanks Dinesh you could also do this by measuring the intensity of the light going through and comparing it to the light coming in right? My hene is 18mw and my 640 diode is 25mw spread to about 5x7 at the plate film is a 4x4 .. this setup works fine with the hene & and the 532nm. ... a nice even spread of yellow , and like lobaz said maybe a 640nm and this amount of spread of red light is not meeting the required amount because of the transmission curve of this polymer
Post Reply