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Applied Optics

Applied Optics


  • Vol. 34, Iss. 20 — Jul. 10, 1995
  • pp: 4105–4110

Three-dimensional optical memory with a photorefractive crystal

Yoshimasa Kawata, Hisahiko Ueki, Yoshimi Hashimoto, and Satoshi Kawata  »View Author Affiliations

Applied Optics, Vol. 34, Issue 20, pp. 4105-4110 (1995)

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We propose a three-dimensional optical-memory device in which refractive dot data are recorded directly into a photorefractive crystal. To record a single bit of datum, one focuses a laser beam with an objective lens onto a specific spot in a crystal, thereby changing its refractive index locally as a result of photorefraction. To record in three dimensions, one keeps the objective lens stationary while the crystal is translated. The beam-spot intensity is modulated with a beam shutter according to the logic state of the data point. The recorded data points are read with a phase–contrast microscope objective lens. We present experimental results of three-dimensional recording and reading with a LiNbO3 crystal. The distribution of the refractive index formed by a focused beam is also analyzed with the charge-transport model.

© 1995 Optical Society of America

Original Manuscript: May 12, 1994
Revised Manuscript: November 28, 1994
Published: July 10, 1995

Yoshimasa Kawata, Hisahiko Ueki, Yoshimi Hashimoto, and Satoshi Kawata, "Three-dimensional optical memory with a photorefractive crystal," Appl. Opt. 34, 4105-4110 (1995)

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