Abstract

We describe the use of two-photon absorption in a photorefractive crystal for recording bit data in multilayered optical memory. A short-pulse near-infrared laser is used for generating the photorefractive effect by two-photon absorption. We succeeded in recording and reading seven layers of data in a ${\mathrm{LiNbO}}_3$ crystal with a lateral resolution (distance between bits) of $5 \mathit{\mu }\mathrm{m}$ and an axial resolution (distance between layers) of $20 \mathit{\mu }\mathrm{m}$.

© 1998 Optical Society of America

Three-dimensional optical memory with a photorefractive crystal

Yoshimasa Kawata, Hisahiko Ueki, Yoshimi Hashimoto, and Satoshi Kawata
Appl. Opt. 34(20) 4105-4110 (1995)

Use of two-photon excitation for erasable–rewritable three-dimensional bit optical data storage in a photorefractive polymer

Daniel Day, Min Gu, and Andrew Smallridge
Opt. Lett. 24(14) 948-950 (1999)

Reflection-type confocal readout for multilayered optical memory

M. Ishikawa, Y. Kawata, C. Egami, O. Sugihara, N. Okamoto, M. Tsuchimori, and O. Watanabe
Opt. Lett. 23(22) 1781-1783 (1998)

Randomly accessible, multilayered optical memory with a Bi₁₂SiO₂₀ crystal

Yoshimasa Kawata, Takuo Tanaka, and Satoshi Kawata
Appl. Opt. 35(26) 5308-5311 (1996)

Three-dimensional optical bit-memory recording and reading with a photorefractive crystal: analysis and experiment

H. Ueki, Y. Kawata, and S. Kawata
Appl. Opt. 35(14) 2457-2465 (1996)