Optical phase encryption by phase contrast using electrically addressed spatial light modulator

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Date
2003
Authors
Nishchal, Naveen Kumar
Joseph, Joby
Singh, Kehar
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Abstract
We report the use of an electrically addressed liquid crystal spatial light modulator (EALCSLM) operating in the phase mode as a phase-contrast filter (PCF). As an application, an optical phase encryption system has been implemented. We encrypt and decrypt a two-dimensional phase image obtained from an amplitude image. Encrypted image is holographically recorded in a Barium titanate crystal and is then decrypted by generating through phase conjugation, a conjugate of the encrypted image. The decrypted phase image is converted into an amplitude image using an EASLM as a PCF. The idea has been supported by the experimental results.
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Keywords
Phase imaging, Phase contrast, Data security, Encryption, Decryption, Phase conjugation, Spatial light modulator
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