Search found 280 matches
- Mon Jul 27, 2020 6:16 am
- Forum: General Holography
- Topic: Geola question
- Replies: 12
- Views: 5339
Re: Geola question
The easiest would be to try recording a small Denisyuk hologram, with beam spread to a small area, say diameter 3 cm. That should make irradiance strong enough.
- Sun Jul 26, 2020 8:22 am
- Forum: Gallery
- Topic: First Light with Integraf Kit
- Replies: 26
- Views: 24304
Re: First Light with Integraf Kit
Yes, "chrome bleach" is a potassium dichromate bleach. Overexposure generally leads to lower contrast of fringes - parts of the emulsion that were intended to be "unexposed" get some exposure due to excess time, while the parts that were intended to be "fully exposed" a...
- Sat Jul 25, 2020 5:47 pm
- Forum: General Holography
- Topic: Geola question
- Replies: 12
- Views: 5339
Re: Geola question
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...
- Sat Jul 25, 2020 10:45 am
- Forum: Gallery
- Topic: First Light with Integraf Kit
- Replies: 26
- Views: 24304
Re: First Light with Integraf Kit
Would you expect JD-2 holograms to reconstruct in green? Yes. The green shift is caused by shrinkage of the emulsion. The fringes recorded in the volume of the emulsion act as mirrors (not exactly, but it is a useful model). The distance between the mirrors is determined by the wavelength used in t...
- Fri Jul 24, 2020 8:39 am
- Forum: General Holography
- Topic: conference on zoom
- Replies: 18
- Views: 7667
Re: conference on zoom
I guess it should be arranged to satisfy the majority and perhaps the organizer.
- Fri Jul 24, 2020 1:20 am
- Forum: Gallery
- Topic: First Light with Integraf Kit
- Replies: 26
- Views: 24304
Re: First Light with Integraf Kit
Surprisingly bright! I wonder where the color came from. Did you alter JD-4 processing? Normally, PFG-03M processed with JD-4 reconstruct in red.
- Fri Jul 24, 2020 1:16 am
- Forum: General Holography
- Topic: conference on zoom
- Replies: 18
- Views: 7667
Re: conference on zoom
It would be great!
- Sat Jan 25, 2020 6:06 am
- Forum: DCG
- Topic: I'm having problems getting my DCG emulsions to work...
- Replies: 8
- Views: 17406
Re: I'm having problems getting my DCG emulsions to work...
Hi, Dan,
it seems you are not completely sure if the problem is in DCG or somewhere else. I think it would be worth buying a pack of photopolymer (e.g. from Geola or Litiholo) and test the setup with it.
Petr
it seems you are not completely sure if the problem is in DCG or somewhere else. I think it would be worth buying a pack of photopolymer (e.g. from Geola or Litiholo) and test the setup with it.
Petr
- Tue Jan 21, 2020 4:42 pm
- Forum: General Holography
- Topic: Introductions
- Replies: 88
- Views: 4840280
Re: Introductions
Welcome, Julian.
Your paper looks interesting. Maybe I finally get an answer what is the Mellin transform good for
Petr
Your paper looks interesting. Maybe I finally get an answer what is the Mellin transform good for
Petr
- Sun Dec 29, 2019 2:24 pm
- Forum: Beginning Holography
- Topic: Current practical methods for printing CGH
- Replies: 6
- Views: 9597
Re: Current practical methods for printing CGH
Chimera process has nothing to do with CGH as discussed in this thread - as far as I know. The Chimera printer is just an evolution step in a well-known holographic stereogram production, the same as Geola, Zebra Imaging, XYZ, former Ultimate printers, etc. The construction is well described in, e.g...