Abstract

We present a joint Fourier-transform correlator working at a 10-kHz repetition rate. It is based on a photorefractive Sn2P2S6 crystal operated in the pulsed direct band-to-band photoexcitation regime at a wavelength of 532  nm and a pulse length of 50  ns. The intersection of two plane waves with a total pulse fluence of 100 μJ/cm2 results in a buildup of thin dynamic holograms to a typical diffraction efficiency of 10-4 in a time of 1 μs and decay again in less than 10 μs. The correlator was tested by a fast image sequence generated by the pulsed readout of a holographic memory system. Successful correlation at a rate of 10  kHz has already been achieved for a pulse energy of only 200  nJ in the template images.

© 2001 Optical Society of America

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