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Dynamic Spatial Filter For Optical Signal Processing Using A Liquid Crystal Light Valve

A device is described which is capable of doing dynamic spatial filtering. The filter, which can be changed at TV frame rates, utilizes a liquid crystal light valve (LCLV) in a controlled-reflectivity mode. A filter pattern can be generated by a CRT or by other optical methods and imaged onto the LCLV. The LCLV is placed in the Fourier plane of an optical transform system. The dynamic spatial filter is described in detail, and current experimental results are given.