Promise of Optical Memories

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Abstract
Holographic and various other techniques may make it possible for the first time to store billions of bits on a permanent and shelvable record so that there is full random addressing in microseconds both for recording and reading out. Such a mass optical memory, with the capacity and permanence of disks, but without any mechanical motion, and the accessibility of cores, may replace both and thereby greatly improve the performance and simplify the architecture and operation of computers. The concept is based on compounded selection, an internal electrically and light addressable matrix array, and holographic storage on an erasable and reusable continuous recording medium. The progress toward implementation of the concept and the remaining challenges will be discussed, including specific aspects of light deflection and modulation, the over-all optical system, and the storage medium.
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