G. Paulhus et Yl. Sheng, OPTICAL ON-AXIS REAL-TIME PHASE-DOMINANT CORRELATOR USING LIQUID-CRYSTAL TELEVISION, Optical engineering, 32(9), 1993, pp. 2165-2172
We use a commercially available liquid crystal television (LCTV) for e
ncoding the on-axis phase-only filter (POF) in a real-time VanderLugt-
type optical correlator. Diffraction theory, computer simulation, and
optical experiments show that the coupled amplitude modulation and the
phase mismatching in the LCTV yield a zero-order spot in the response
of the POF and reduce the diffraction efficiency to about 60 to 70%.
The correlation output of the filter is a superposition of the POF cor
relation peak and an image of the input. The filter, referred to as th
e phase-dominant filter, behaves like the POF with advantages of on-ax
is correlation, high light efficiency, and utilization of all the avai
lable space bandwidth product of the LCTV. Optical experimental result
s are shown.