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Proceedings Paper

Practical implementation of phase-only optical encryption system
Author(s): Paul C. Mogensen; Jesper Glueckstad
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Paper Abstract

In this paper, we present a system for the practical implementation of phase-only optical encryption. Our approach is based on the use of the generalized phase contrast technique for the readout of decrypted information contained within the phase component of an optical wavefront. The decryption is achieved by superimposing a decrypting phase key and an encrypted phase mask in the image plane of an optical system and then applying the generalized phase contrast technique to generate an intensity pattern corresponding to the original encoded information. We have constructed an experiment system in which an encrypted binary phase mask is decrypted by a binary phase key that is implemented electronically on a phase-only spatial light modulator allowing a simplified electronic alignment of the key by scrolling its position with respect to the mask.

Paper Details

Date Published: 7 April 2000
PDF: 10 pages
Proc. SPIE 3973, Optical Security and Counterfeit Deterrence Techniques III, (7 April 2000); doi: 10.1117/12.382199
Show Author Affiliations
Paul C. Mogensen, Riso National Lab. (Denmark)
Jesper Glueckstad, Riso National Lab. (Denmark)

Published in SPIE Proceedings Vol. 3973:
Optical Security and Counterfeit Deterrence Techniques III
Rudolf L. van Renesse; Willem A. Vliegenthart, Editor(s)

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