High areal density holographic data storage system

G - Physics – 11 – B

Patent

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Details

G11B 7/0065 (2006.01) G11C 13/04 (2006.01)

Patent

CA 2527879

An apparatus for recording or reading high areal density holographically stored information with high signal-to-noise ratio. The apparatus comprises a holographic imaging system for recording or reconstructing a holographic image, having a first numerical aperture and a first focal length and an additional optical system for filtering the signal beam, having a second numerical aperture and a second focal length, wherein the numerical aperture of the additional optical system is less than the numerical aperture of the holographic imaging system and/or the focal length of the additional optical system is greater than the optical length of the holographic imaging system.

L'invention concerne un appareil permettant d'enregistrer ou de lire des informations stockées de manière holographique à densité de surface élevée avec un rapport signal-bruit élevé. Ledit appareil comprend un système d'imagerie holographique permettant d'enregistrer ou de reconstruire une image holographique possédant une première ouverture numérique et une première longueur focale; et un système optique supplémentaire permettant de filtrer le faisceau de signaux possédant une seconde ouverture numérique et une seconde longueur focale, l'ouverture numérique du système optique supplémentaire étant plus petite que celle du système d'imagerie holographique et/ou la longueur focale du système optique supplémentaire étant plus grande que celle du système d'imagerie holographique.

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