| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and apparatus for efficiently recording /reproducing optical information by using at least two concentric patterns for a servo pattern in a holographic digital data storage system. SOLUTION: Holographic page data in the holographic digital data storage system have at least the two concentric patterns with the optical information arranged within an outermost pattern of at least the two concentric patterns. Since at least the two concentric patterns in the holographic digital data are deformed into at least two elliptic patterns in a diffracted beam caused by irradiation of a reference beam, at least the two elliptic patterns are extracted from the diffracted beam and then at least the two elliptic patterns are estimated to generate at least two estimated concentric patterns. A compensated vector between at least the two elliptic patterns and at least the two estimated concentric patterns are used to reconstruct the optical information from the diffracted beam. COPYRIGHT: (C)2004,JPO
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