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Proceedings Paper

Long lifetime of two-color nonvolatile holograms in near-stoichiometric lithium tantalate crystals
Author(s): Kenji Kitamura; Youwen Liu; Shunji Takekawa; Hideki Hatano; Yasunori Furukawa
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Paper Abstract

Two-color holography is an effective solution to the volatile readout problem in volume holographic data storage based on photorefractive materials. Popular materials for two-color holography are reduced doped and nondoped near-stoichiometric lithium niobate crystals. However, the lifetime at room temperature is from several weeks to several months depending on the reduction state of the material. Moreover, reductive treatment will degrade the nonvolatility of two-color holograms. The important issue for two-color holography is how to increase the lifetime. In this contribution, lifetimes of two-color nonvolatile holograms recorded in as-grown near-stoichiometric lithium niobate and tantalate crystals were compared by extrapolating the high-temperature data. The dark-decay time constants obey an Arrhenius dependence on absolute temperature and yield activity energy of 1.06 eV around in all measured crystals. Lifetimes of holograms in nondoped and slightly doped crystals depend on the proton concentration. Lifetimes of hologram in lithium tantalate are one order of magnitude longer than those in lithium niobate at the same proton concentration. The lifetime of two-color holograms in lithium tantalite is longer than 20 years.

Paper Details

Date Published: 17 June 2004
PDF: 4 pages
Proc. SPIE 5362, Advanced Optical and Quantum Memories and Computing, (17 June 2004); doi: 10.1117/12.528686
Show Author Affiliations
Kenji Kitamura, National Institute for Materials Science (Japan)
Youwen Liu, National Institute for Materials Science (Japan)
Shunji Takekawa, National Institute for Materials Science (Japan)
Hideki Hatano, Pioneer Corp. (Japan)
Yasunori Furukawa, Oxide Corp. (Japan)

Published in SPIE Proceedings Vol. 5362:
Advanced Optical and Quantum Memories and Computing
Hans J. Coufal; Zameer U. Hasan, Editor(s)

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