7 May 1999 Optical encryption system using a spatial light modulator
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Proceedings Volume 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99); (1999); doi: 10.1117/12.347734
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '99), 1999, Yokohama, Japan
Abstract
We implemented an optical encryption system that uses random Fourier plane encoding as the encryption method. In this method, data is encrypted by using a random phase function in the Fourier plane. In the earlier systems, the random phase function has been mostly implemented by fabricating random phase mask using photolithographic technique or by photographic bleaching process. We implement the binary random phase function using a Ferroelectric spatial light modulator (SLM). The use of SLM eliminates the need of fabricating the random phase mask which makes the SLMs suitable candidates in the encryption systems. The encrypted image which is a complex function is holographically recorded in a photorefractive BaTiO3 crystal.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. Unnikrishnan, Joby Joseph, Kehar Singh, "Optical encryption system using a spatial light modulator", Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); doi: 10.1117/12.347734; https://doi.org/10.1117/12.347734
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KEYWORDS
Image encryption

Spatial light modulators

Crystals

Computer programming

Fourier transforms

Optical image encryption

Phase conjugation

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