Space-variant optical correlator based on the fractional Fourier transform: implementation by the use of a photorefractive Bi₁₂GeO_2a (BGO) holographic filter

Abstract

A space-variant optical correlator is proposed on the basis of the fractional Fourier transform. The optical device uses as a recording medium for the holographic filter a photorefractive Bi₁₂GeO₂ (BGO) crystal. The experimental results confirm the shift-variance properties. Some limitations that arise from the volume diffraction are also considered.

© 1996 Optical Society of America

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