Optical: systems and elements – Holographic system or element – Having particular recording medium
Patent
1996-05-29
1998-10-13
Henry, Jon W.
Optical: systems and elements
Holographic system or element
Having particular recording medium
359 24, 369103, G03H 118, G03H 128, G11B 1112
Patent
active
058220909
ABSTRACT:
The present invention describes a method for high capacity holographic data storage in photorefractive crystals. A doped ferroelectric crystal is used as a data storage medium. Prior to the recording, the crystal is depoled either thermally or electrically. Multiplexed photorefractive holograms are then recorded by illuminating the crystal in such a manner that domain screening of the photorefractive space-charge field occurs. The crystal is then repoled to enable the reading of the holograms stored within the crystal. Finally, any given hologram is readout by illuminating the crystal at the Bragg condition, which typically occurs while illuminating the crystal at the same angle and/or wavelength at which the hologram was recorded.
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Henry Jon W.
Quinta Corporation
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