System and method for recording of information on a...

G - Physics – 11 – B

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G11B 7/0065 (2006.01) G03H 1/26 (2006.01) G11B 7/0033 (2006.01)

Patent

CA 2331964

The invention relates to a method for the recording and reading of data with a holographic write/read apparatus onto a holographic recording medium with a thin holographic recording layer. The medium is preferably an optical card (2). The recording of the information is in the form of data pages stored as thin Fourier holograms (61). According to the invention, it is foreseen to use reflected transmission and polarisation holography with different write and read wavelengths, and to correct during reading the distortion in the readout channel caused by the difference between the write and read wavelengths. The invention further relates to an apparatus and system for performing the method. There is also disclosed a method of coding the recorded information.

Cette invention concerne un procédé qui permet, à l'aide d'un appareil d'écriture/lecture holographique, d'enregistrer et de lire des données sur un support d'enregistrement holographique possédant une fine couche d'enregistrement holographique. Ce support consiste de préférence en une carte optique (2). L'enregistrement des informations se fait sous forme de pages de données qui sont stockées sous forme d'hologrammes de Fourier fins (61). Ce procédé consiste à utiliser une holographie à émission réfléchie et à polarisation avec des longueurs d'onde de lecture et d'écriture différentes. Ce procédé consiste également, lors de la lecture, à corriger la distorsion du canal de lecture qui est due à la différence entre les longueurs d'onde d'écriture et de lecture. Cette invention concerne également un appareil et un système permettant de mettre en oeuvre ce procédé. Cette invention concerne en outre un procédé de codage des informations enregistrées.

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