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Research Paper

Journal of the Optical Society of Korea 2012; 16(4): 354-364

Published online December 25, 2012 https://doi.org/10.3807/JOSK.2012.16.4.354

Copyright © Optical Society of Korea.

2-step Quadrature Phase-shifting Digital Holographic Optical Encryption using Orthogonal Polarization and Error Analysis

Sang Keun Gil

Department of Electronic Engineering, The University of Suwon

Received: July 31, 2012; Revised: October 22, 2012; Accepted: November 6, 2012


In this paper, a new 2-step quadrature phase-shifting digital holographic optical encryption method using orthogonal polarization is proposed and tolerance errors for this method are analyzed. Unlike the conventional technique using a PZT mirror, the proposed optical setup comprises two input and output polarizers, and one ${\lambda}$/4-plate retarder. This method makes it easier to get a phase shift of ${\pi}$/2 without using a mechanically driven PZT device for phase-shifting and it simplifies the 2-step phase-shifting Mach-Zehnder interferometer setup for optical encryption. The decryption performance and tolerance error analysis for the proposed method are presented. Computer experiments show that the proposed method is an alternate candidate for 2-step quadrature phase-shifting digital holographic optical encryption applications.

Keywords: Optical encryption, Digital holography, Phase-shifting interferometry, Cryptosystem,

OCIS codes: 090.0090; 090.2880; 070.0070; 200.4560; 170.3010