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Annual Meeting Optical Society of America

Through the looking glass…

Amnon Yariv

Published Jan 1, 1986• 0 citations
Publisher

Abstract

We can look through cloudy glass, correlate, subtract, and convolve images in real time, we can amplify coherent beams and make length insensitive resonators and also store and recall images associatively. I attempt to show how all these wonderful things can be accomplished using the tools and concepts of the field of phase conjugate optics.

DOI
10.1364/oam.1986.wa1

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We can look through cloudy glass, correlate, subtract, and convolve images in real time, we can amplify coherent beams and make length insensitive resonators and also store and recall images associatively. I attempt to show how all these wonderful things can be accomplished using the tools and concepts of the field of phase conjugate optics.
A coherent optical memory is described. The device operates on the principle that an optical resonator employing a holographic grating can have user-prescribed eigenmodes. Each information entity (e.g., an image of a cat) defines an eigenmode of the resonator. The stored information is accessed by injecting partial information (e.g., an image of the cat’s ear) into the resonator. A gain medium internal to the resonator amplifies the field belonging to the eigenmode that most resembles the injected field; the other eigenmodes are suppressed through a competition for the gain. A simple optical memory exhibiting associative recall is demonstrated.
A programmable optical resonator is one in which a hologram assumes the role of one of the mirrors of an ordinary optical resonator. A holographic recording medium allows the optical electric field eigenmodes of the resonator to be user-defined. Interest in this kind of resonator stems from their potential as associative optical memories. When the holographic medium is a photorefractive or other real-time recording medium, the resonator can learn, recall, and forget programmed information. Recall is achieved by placing a gain medium, such as an externally pumped photorefractive crystal, inside the resonator. The gain medium excites eigenmodes of the resonator. Using LiNbO3 as the recording medium and pumped BaTiO3 as the gain medium we have been able to store and recall complicated images as eigenmodes of a resonator.
The Bi12SiO20 (BSO) crystal has been used as an optical storage medium for a 2-D optical field to obtain a delayed coherent optical image. The method used the BSO crystal in a four-wave mixing configuration to produce a phase-conjugated wave front. It has been demonstrated that the image of a vinyl film could be compared with its stored image over a time delay varying from 40 msec to a few seconds. Measurements have also been made of the changes of optical path length within this inhomogeneous medium.