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Optical interferometry with (forward) redirected phase-conjugate beams

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Abstract

We demonstrate a new type of interferometer based on interference between an image bearing beam and its forward redirected phase-conjugate reflection. This interferometer possesses some interesting features that are potentially useful. In one special case, where the optical path difference between the interfering beams is λ/4, and the input plane is Fourier transformed through an ordinary lens, our interferometer operates as an Hartley transformer for real images in the input plane. This offers realization of a variety of image processing applications by real (only) filters, and may simplify many optical pattern recognition implementations. Another use is a shift detector, which gives the accurate coordinates of a displaced object (that in the general case may be complex) with respect to the origin. Other types of mathematical operation on the input image are also possible.

© 1991 Optical Society of America

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