D. Roberge et Yl. Sheng, OPTICAL REAL-TIME CORRELATOR FOR IMPLEMENTATION OF PHASE-ONLY COMPOSITE FILTERS, Optical engineering, 35(9), 1996, pp. 2541-2547
We implement an optical continuous phase-only composite filter for sec
urity verification. An amplitude-mostly liquid crystal television (LCT
V) is used for input and a phase-mostly LCTV is used for the phase-onl
y filter. We develop experimental techniques for optimizing the LCTV m
odulations and analyze the diffraction of both coupled-mode LCTVs. We
use a new procedure for synthesizing the phase-only composite filters.
The filter produces a narrow correlation peak without sidelobes. Expe
rimentation results are shown. (C) 1996 Society of Photo-Optical Instr
umentation Engineers.