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US 2003/0156309 A1Published application
Confocal holographic optical storage with non-overlapping records
AssigneeInstitut “Jozef Stefan”
InventorMarko Zgonik
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AssigneeInstitut “Jozef Stefan”
InventorMarko Zgonik
Estimating the term…
The present invention relates to a method and a system for the storage of data in the form of volume holograms which do not mutually overlap. The storage medium consists of a light-sensitive materail in the form of a plate of thickness D, in which a single hologram is essentially shaped as a cylinder with the minimal possible cross-section. The signal light beam is modulated with data and directed onto the plate-shaped storage material by means of a lens or a convenient optical system, illuminating an area of said material which, for a given amount of data, is the smallest possible. To record a hologram, a reference light beam is used, incident upon the storage material either from the same direction as the signal beam, or opposite thereto. In contradistinction to prior-art solutions, the inventive reference light beam used for recording illuminates, in the most favorable case, the smallest possible volume of the storage material. The holgoram is only written in the portion where the signal and the reference beams overlap, so its volume is equal to the volume illuminated by the reference beam.
A method of storing volume holograms which do not mutually overlap, using at storage material for volume holography. in the form of a plate, wherein writing is achieved through optical interference of the reference and modulated signal beams, characterized in that a plurality of holograms, which do not mutually overlap, are written in the plate, the angles between a line normal to the plane of the plate and the axes of the signal and reference beams, respectively, are smaller than 45 degrees, the diameter of the waist of the reference beam is smaller than the lateral extent of the signal beam in the illuminated portion of the plate, and the volume of a single hologram is equal to the portion of the volume illuminated in the plate by the reference beam.
A confocal holographic optical storage system with non-overlapping records, with high data density and parallel read/write operation, characterized in that comprises:
Confocal holographic optical storage system with non-overlapping records with high data density and parallel read operation, characterized in that it comprises:
Dependencies are inferred from the claim text.