Difference between revisions of "Hints and Kinks"

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This is a collection of simple tips and techniques worth sharing.
 
This is a collection of simple tips and techniques worth sharing.
  
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== Darkroom ==
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== Silver-halide ==
 
== DCG ==
 
== DCG ==
 
==== Effect of Overexposure ====
 
==== Effect of Overexposure ====
 
{|
 
{|
 
| [[Image:DCGdiffeff.jpg | 400px | right]]
 
| [[Image:DCGdiffeff.jpg | 400px | right]]
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adapted from a post by Joe Farina, http://holoforum.org/forum/viewtopic.php?f=7&t=652
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 +
 
Overexposure can have a drastic effect on dichromated gelatin.  Test strips early and often are well advised.
 
Overexposure can have a drastic effect on dichromated gelatin.  Test strips early and often are well advised.
  
 
The graph is from ''Lasers and Holography'' by Mehta and Rampal, 1993.  It was reprinted from a paper by Chang and Leonard, "Dichromated gelatin for the fabrication of holographic optical elements," ''Applied Optics'', 1979.
 
The graph is from ''Lasers and Holography'' by Mehta and Rampal, 1993.  It was reprinted from a paper by Chang and Leonard, "Dichromated gelatin for the fabrication of holographic optical elements," ''Applied Optics'', 1979.
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|}
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==== Boiling holograms ====
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{|
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|
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{| style="float: right;"
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| [[Image:bb1.jpg | 250px | Buddha before boiling]]
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|-
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| [[Image:bb2.jpg | 250px | Buddha after boiling]]
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|}
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adapted from a post by manalokos, http://holoforum.org/forum/viewtopic.php?f=7&t=138
  
  
http://holoforum.org/forum/viewtopic.php?f=7&t=652
+
I was frustrated with a hologram of a tiny buddha statue because it was dim and narrow-band, shifting a bit too much to the blue. I heated water until it boiled, took it out of the heat source, and then dropped the plate inside, left it there for 60 seconds, and put it into ambient temp water.  I re-developed it, and I got a much more broadband and brighter result.
 
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Revision as of 19:05, 26 May 2013

This is a collection of simple tips and techniques worth sharing.

Darkroom

Silver-halide

DCG

Effect of Overexposure

DCGdiffeff.jpg

adapted from a post by Joe Farina, http://holoforum.org/forum/viewtopic.php?f=7&t=652


Overexposure can have a drastic effect on dichromated gelatin. Test strips early and often are well advised.

The graph is from Lasers and Holography by Mehta and Rampal, 1993. It was reprinted from a paper by Chang and Leonard, "Dichromated gelatin for the fabrication of holographic optical elements," Applied Optics, 1979.


Boiling holograms

Buddha before boiling
Buddha after boiling

adapted from a post by manalokos, http://holoforum.org/forum/viewtopic.php?f=7&t=138


I was frustrated with a hologram of a tiny buddha statue because it was dim and narrow-band, shifting a bit too much to the blue. I heated water until it boiled, took it out of the heat source, and then dropped the plate inside, left it there for 60 seconds, and put it into ambient temp water. I re-developed it, and I got a much more broadband and brighter result.