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Double-multiplexed computer-generated holograms

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Abstract

The most important element in an optical data processor is the complex spatial filter. Lohmann and Paris1 invented the detour phase method for binary encoding of a complex filter function. The reconstructed object is obtained along the first diffraction order. In many applications such as multiple correlation or complex incoherent correlation2, a filter that contains information of two objects is required. In this project we suggest a technique for encoding two objects using a single computer generated hologram, without using a plotter with higher spatial resolution. This was done by improving one of the detour phase encoding methods. The reconstructed objects are obtained along orthogonal diffraction directions. Laboratory experiments were done in order to demonstrate the suggested technique.

© 1993 Optical Society of America

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