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Proceedings Paper

Performance evaluation of phase holograms recorded in methylene-blue-sensitized dichromated gelatin
Author(s): Sastry V. Pappu; Rupak Changkakoti
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Paper Abstract

Systematic studies have been carried out on the performance evaluation of volume phase holograms recorded in methylene blue sensitized dichromated gelatin (MBDCG) to identify the conditions to be fulfilled to realize optimum difraction efficiency in such holograms.A noteworthy feature of the studies is that inexpensive nonstandard gelatin has been used. The studies have revealed that optimum diffraction efficiency can be achieved when, (a) the pH of the first development bath is kept around 65; (b) the concentration of axnmonium dichromate as prehardner is maintained around 0.5 '1. by weight of gelatin; (c) the concentration of ammonium dichromate and methylene blue photo.sensitizers is fixed around 30 gm/litre and 0.3 gm/litre respectively;and (d) no external electron donor is added.Further,it is found that the decrease in diffraction efficiency consequent upon the storage of holograms can be restored almost perfectly to the original level by reprocessing the holograms.Based on our studies, it is proposed that DCG can be used fruitfully as a model information recording medium to investigate such aspects as senility,information loss and restoration,in the context of the development of optical memories.

Paper Details

Date Published: 1 April 1990
PDF: 8 pages
Proc. SPIE 1213, Photopolymer Device Physics, Chemistry, and Applications, (1 April 1990); doi: 10.1117/12.18009
Show Author Affiliations
Sastry V. Pappu, Indian Institute of Science (United States)
Rupak Changkakoti, Indian Institute of Science (Canada)

Published in SPIE Proceedings Vol. 1213:
Photopolymer Device Physics, Chemistry, and Applications
Roger A. Lessard, Editor(s)

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