Implementation of a photorefractive correlator based on a fake zoom lens

摘要

A space-variant optical correlator is experimentally implemented based on the fractional Fourier transform. The proposed arrangement employs a fake zoom lens that enables to vary the degree of the fractional Fourier transform continuously between -1 to +1. The optical device uses as a recording medium for the holographic filter a photorefractive BTO crystal. The experimental results confirm the shift-variance properties. [References: 12]