Experimenter's Corner

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Holography has a wealth of possibilities for the amateur and professional holographer, alike.

Ferric Ammonium Oxalate

FAO TestGrating.JPG
FAO TestFigure.jpg

Ferric ammonium oxalate (FAO) and possibly ferric ammonium citrate (FAC) have possibilities as a substitute for ammonium or potassium dichromate in gelatin. Experimentation is chronicled in two Holoforum threads: http://holoforum.org/forum/viewtopic.php?f=7&t=440 and http://holoforum.org/forum/viewtopic.php?f=7&t=497 .

Test plates were fabricated using:

  • 30 g gelatin, 250-bloom pork
  • 6 g ferric ammonium oxalate
  • 300 ml water

The coating thickness was estimated to be 7 to 9 microns. Plates were three days after coating. Geometry was a two-beam transmission grating at zero degrees and 24 degrees (~900 l/mm) at 457 nm from a solid state Melles Griot laser. The pictured plate was a 60 mJ exposure (mJ/cm^2?).

Processing was as follows:

  • 10 seconds in 1% Hydrogen Peroxide
  • 2 minutes water @ ~ 18 deg C
  • dehydration with IPA as per DCG processing

The second picture is a single-beam reflection hologram take with a 25 minute exposure.