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Optical Engineering

Using dichromated gelatin as a diffractive optical storage medium and illustration of multiple applications
Author(s): Harry K. Ramenah; Paul Bertrand; Patrick Meyrueis
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Paper Abstract

We describe the storage of 2000 images of resolution 512 3512 pixels as a regular matrix pattern of 10310 elements, where each element is angularly multiplexed 20 times in a 25-?m thickness of dichromated gelatin emulsion without crosstalk effect. The surface area of the matrix is 1 cm2. We show good concordance of the angular selectivity between the experimental result and theory. The diffraction efficiency of each of the 20 multiplexed images has been measured and has nearly the same value. Examples of reconstructed images for multiple applications are given, for example, storage of 160,000 images on a 3/2-in. floppy-disk format, that is, about 100 minutes of black-and-white films. Applications to automobile cartography and for storing x-ray and weather forecast images are possible. Colored diffractive images are also possible and are illustrated.

Paper Details

Date Published: 1 May 1996
PDF: 6 pages
Opt. Eng. 35(5) doi: 10.1117/1.600698
Published in: Optical Engineering Volume 35, Issue 5
Show Author Affiliations
Harry K. Ramenah, Univ. Louis Pasteur Strasbourg (France)
Paul Bertrand, Imagine Technologies Co. (France)
Patrick Meyrueis, Ecole Nationale Superieure de Physique (France)

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