Search found 440 matches
- Thu Nov 23, 2023 2:17 pm
- Forum: Off Topic
- Topic: Whatever Became of Holography?
- Replies: 19
- Views: 35140
Re: Whatever Became of Holography?
This is from R.R.A. Syms "Practical Volume Holography" (Oxford Engineering Scientific Series), Oxford Science Publications, 1990, page 184: "Even for weakly modulated gratings, coupled wave theory predicts a considerable difference in diffraction efficiency between the two possible re...
- Mon Oct 09, 2023 8:53 am
- Forum: For Sale / Want to Buy / Trade
- Topic: Looking for photopolymer films
- Replies: 11
- Views: 18131
Re: Looking for photopolymer films
How much do you want? Are you able to mount it to glass plates yourself?
- Fri Sep 29, 2023 10:02 am
- Forum: General Holography
- Topic: Moving the object to reduce speckle?
- Replies: 9
- Views: 7028
Re: Moving the object to reduce speckle?
Don't you think it would be easier to wiggle the mirror? Either way, I think you'd smear objective speckle but not affect subjective speckle which happens during reconstruction.
- Sun Sep 03, 2023 8:27 am
- Forum: Beginning Holography
- Topic: How difficult is it to make hologram prints?
- Replies: 2
- Views: 4906
Re: How difficult is it to make hologram prints?
Happy to hear of someone wanting to do new holography, but unfortunately it will be difficult to set up a studio to do as you describe. Jeff Weil in Florida was the last independent holographer shooting masters for embossed holograms in the states, and he's now retired. Those who may still sell embo...
- Sat Dec 17, 2022 11:04 am
- Forum: AgX
- Topic: Printout revisited
- Replies: 3
- Views: 22940
Re: Printout revisited
I'd recommend a KI in water bath before the drying steps. You're replacing the bromide as Dinesh mentions, and that won't be affected by the subsequent graded alcohol baths. All the alcohol baths do is dissolve the water out of the emulsion, and replace it with a faster evaporating liquid. There's r...
- Mon Apr 11, 2022 9:25 am
- Forum: Events, announcements, and news
- Topic: Vintage Lasers & Holograms
- Replies: 6
- Views: 20790
Re: Vintage Lasers & Holograms
I'm happy to announce that this exhibit will be extended for the next year at least. I have to say the combination of holograms with old lasers really seems to work well, though they tend to steal the show amongst the general public. But that's fine with me!
- Thu Mar 17, 2022 8:38 am
- Forum: Events, announcements, and news
- Topic: Vintage Lasers & Holograms
- Replies: 6
- Views: 20790
Re: Vintage Lasers & Holograms
A podcast discussing my collection and exhibit is now available here: https://www.photonics.com/Podcast/pce46?refer=picks
- Sun Jan 23, 2022 10:46 am
- Forum: AgX
- Topic: Reuse of Pyrogallol developer
- Replies: 46
- Views: 72380
- Sun Jan 23, 2022 9:56 am
- Forum: AgX
- Topic: Reuse of Pyrogallol developer
- Replies: 46
- Views: 72380
Re: Reuse of Pyrogallol developer
Squeege after the fotoflo?
- Sun Jan 23, 2022 9:50 am
- Forum: AgX
- Topic: Reuse of Pyrogallol developer
- Replies: 46
- Views: 72380
Re: Reuse of Pyrogallol developer
Use the detector perpendicular to the beams when measuring to calculate beam ratio. Beam ratio is independent of the orientation of a recording plate, as it determines the fringe visibility in space. Use it parallel to the recording plane when calculating exposure if you like. Since exposure is usua...