Abstract

Real-time image correlation is achieved by coupling coherent Fourier spectra inside saturable absorbers. Previously described optical correlators using nonlinear susceptibilities are strongly limited by the angular selectivity of Bragg diffraction in thick interaction cells. We overcame these difficulties by a special 3-D arrangement of the interfering beams. High-quality quasi-real-time holographic images, enabling cross-correlation of photographic transparencies free of detection noise, are demonstrated.

© 1980 Optical Society of America

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