Abstract
We implement an optical continuous phase-only composite filter for security verification. An amplitude-mostly liquid crystal television (LCTV) is used for input and a phase-mostly LCTV is used for the phase- only filter. We develop experimental techniques for optimizing the LCTV modulations and analyze the diffraction of both coupled-mode LCTVs. We use a new procedure for synthesizing the phase-only composite fil- ters. The filter produces a narrow correlation peak without sidelobes. Experimentation results are shown. © 1996 Society of Photo-Optical Instrumen- tation Engineers.
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