Abstract
We demonstrate the function of a nonlinear optical element based on photoanisotropy in azo-dye doped polymers for incoherent image processing. This element allows the realization of a matched filter which performs the multiplication of the Fourier transform of a transparency E 1 with the squared absolute value of the Fourier transform of a second transparency E 2. Both transparencies are illuminated by a plane wave. The back-transform yields an intensity distribution equivalent to convolution of E 1 with the autocorrelation function of E 2. The main advantage of this method is the use of two mutually incoherent light beams. A theoretical description and an experimental verification of this element are presented.
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