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 λ/4-plate retarder. This method makes it easier to
get a phase shift of π/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.
© 2012 Optical Society of Korea
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