Hologram apparatus and hologram recording method

Details Hologram apparatus and hologram recording method Hologram apparatus and hologram recording method

2005-07-11

2009-02-24

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

07496024

ABSTRACT:
The present invention provides a hologram apparatus for recording an interference fringe of a signal beam and a reference beam having a speckle pattern in a recording area of a hologram recording material. The hologram apparatus includes a speckle pattern generating unit for generating the speckle pattern so that the speckle pattern is different in form in the track direction and the cross-track direction of the recording area. With this configuration, it is possible to perform recording under an increased tolerance in the cross-track direction while securing the shift selectivity necessary in the track direction, and, hence, to easily and stably perform the tracking servo at the time of reproduction.

REFERENCES:
patent: 6108110 (2000-08-01), Orlov et al.
patent: 6614566 (2003-09-01), Curtis et al.
patent: 7277211 (2007-10-01), Baba et al.
patent: 7362687 (2008-04-01), Tsukagoshi
Masatoshi Bunsen, et al., “Hologram Multiplexing with photorefractive beam-fanning speckle”, Optics Communications, vol. 235, No. 1-3, May 1, 2004, pp. 41-47.

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