Systematic errors of an optical encryption system due to the discrete values of a spatial light modulator

Abstract

Abstract. An optical implementation of the amplitude encoded double random phase encryption/decryption technique is implemented, and both numerical and experimental results are presented. In particular, we examine the effect of quantization in the decryption process due to the discrete values and quantized levels, which a spatial light modulator ͑SLM͒ can physically display. To do this, we characterize a transmissive SLM using Jones matrices and then map a complex image to the physically achievable levels of the SLM using the pseudorandom encoding technique. We present both numerical and experimental results that quantify the performance of the system. © 2009 Society of Photo-Optical Instrumentation Engineers.