Abstract

The optical disk is a computer-addressable binary storage medium with very high capacity. More than 10¹⁰ bits of information can be recorded on a 12-cm-diameter optical disk. The natural two-dimensional format of the data recorded on an optical disk makes this medium particularly attractive for the storage of images and holograms, while parallel access provides a convenient mechanism through which such data may be retrieved. In this paper we discuss a closed-loop optical associative memory based on the optical disk. This system incorporates image correlation, using photorefractive media to compute the best association in a shift-invariant fashion. When presented with a partial or noisy version of one of the images stored on the optical disk, the optical system evolves to a stable state in which those stored images that best match the input are temporally locked in the loop.

© 1993 Optical Society of America

Optical memory disks in optical information processing

Demetri Psaltis, Mark A. Neifeld, Alan Yamamura, and Seiji Kobayashi
Appl. Opt. 29(14) 2038-2057 (1990)

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Computer-generated holography for optical memory using sparse data words: capacity and error tolerance

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Performance of real time associative memory using a photorefractive crystal and liquid crystal electrooptic switches

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