Search found 131 matches
- Tue Dec 07, 2021 10:50 am
- Forum: AgX
- Topic: emulsion thickness
- Replies: 17
- Views: 17588
Re: emulsion thickness
If the recording medium is thin, then there are fewer Bragg planes, and the variation of the spacing from the mean may be high (large standard deviation), resulting in a broad range of wavelengths. As the medium gets thicker, the variation from the mean gets smaller (the standard deviation drops), ...
- Mon Dec 06, 2021 5:28 am
- Forum: AgX
- Topic: silver halide emulsion preparation
- Replies: 8
- Views: 11202
Re: silver halide emulsion preparation
Again, take a look at the pdf file at: https://holographyforum.org/forum/downl ... hp?id=7201
- Mon Dec 06, 2021 4:21 am
- Forum: AgX
- Topic: emulsion thickness
- Replies: 17
- Views: 17588
Re: emulsion thickness
So if you aim at very narrow bandwidth, you'd need a thick (I think ~ 1 - 2um or so) recording medium. Volume gratings e.g. currently used to run compact ECL laser diodes at single frequency (see Ondax, now Coherent I believe) would come to my mind. Sorry for the typo. I meant 1 - 2mm thick recordi...
- Sun Dec 05, 2021 8:19 am
- Forum: AgX
- Topic: emulsion thickness
- Replies: 17
- Views: 17588
Re: emulsion thickness
Typically, AgX emulsions are ~ 8 u. The micrometer you link to states a resolution of 0.001 mm, or 1u. Thus, it can measure an 8u thickness, but, with a resolution of 1u, the error is 8 +/- 1 or 1/8, or 12.5%. This is too inaccurate for technical work, but is not a problem for display. Agx has typi...
- Sun Dec 05, 2021 8:16 am
- Forum: AgX
- Topic: silver halide emulsion preparation
- Replies: 8
- Views: 11202
Re: silver halide emulsion preparation
what are the effective washing methods for 0.5 and 3 % gelatin concentrated silver halide emulsion? and also how to improve the spectral sensitivity of the silver halide emulsion for 632.8 laser? In short: freezing and thawing as outlined e.g. at https://holographyforum.org/forum/download/file.php?...
- Thu Nov 04, 2021 2:55 am
- Forum: DCG
- Topic: Diazo (Speedball) gelatin hologram
- Replies: 33
- Views: 205614
Re: Diazo (Speedball) gelatin hologram
Pretty amazing! Thanks for the info, Dinesh.
- Mon Nov 01, 2021 9:38 am
- Forum: DCG
- Topic: Diazo (Speedball) gelatin hologram
- Replies: 33
- Views: 205614
Re: Diazo (Speedball) gelatin hologram
The final colour of the display piece can be varied, from the recording wavelength, to about 100nm, its a balance between formula, recording and development; this is because of the high dynamic range of DCG. We were able to get some pieces below the recording wavelength. I was wondering about that ...
- Mon Nov 01, 2021 9:35 am
- Forum: DCG
- Topic: Diazo (Speedball) gelatin hologram
- Replies: 33
- Views: 205614
Re: Diazo (Speedball) gelatin hologram
I too suspect 405 is underrated for display work. My exposures in standard DCG with the 445 and 488 are easier to make bright gold than anything else, and this represents a rather large redshift from the recording wavelengths. It would seem that 405 would tend to produce great bright green replay u...
- Sun Oct 24, 2021 10:27 am
- Forum: DCG
- Topic: Diazo (Speedball) gelatin hologram
- Replies: 33
- Views: 205614
Re: Diazo (Speedball) gelatin hologram
If my assistance would be useful in developing the technology, I would love to help. Please do. Any help will be greatly appreciated. Given the scarce experience with holographic diazo gelatin materials, this is almost pioneering work. Lasers on hand: 405, 445, 473, 488, 532, 568. Sounds impressive...
- Wed Sep 29, 2021 8:07 am
- Forum: DCG
- Topic: Diazo (Speedball) gelatin hologram
- Replies: 33
- Views: 205614