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We describe initial experiments on a photorefractive-based optical image correlator which employs a frequency-doubled, pulsed Nd: YAG laser with a pulse length of 10 ns to write a phase grating into a crystal of bismuth silicon oxide. The correlation of simple binary images has been demonstrated, and measurements indicate that the rise time of the correlation signal is less than 200 ns.
Optical image correlation with a low-power HeNe laser has been demonstrated using the phenomenon of degenerate four-wave mixing in Bi12SiO20. Preliminary results for character recognition, using a compact two-dimensional image processor, are presented.
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