Optimization in mapping of correlation filters in a liquid crystal display based frequency plane correlator

An optimization procedure for the optical implementation of correlation filters (CFs) in an optical-hybrid frequency plane correlator is presented. Our approach is based on mapping of the given calculated CF values to the values constrained by the available spatial light modu- lator (SLM) device to achieve the maximum intensity of the output cor- relation peak. The optimization is provided for the implementation of the CFs using a Sanyo liquid crystal display (SLCD). The commercially avail- able SLCDs are characterized by the phase modulation curves that are (1) nonlinear, (2) of a smaller total phase change interval than desired (0,2p) interval, and (3) significantly disturbed by the coupled amplitude variations. For such a case, the optimization achieved by varying a phase shift parameter is explained theoretically, demonstrated numeri- cally, and confirmed experimentally. © 1999 Society of Photo-Optical Instrumen- tation Engineers. (S0091-3286(99)01106-X)

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