Confocal holographic optical storage with non-overlapping records
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United States of America Patent
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Aug 24, 2004
Grant Date -
Aug 21, 2003
app pub date -
Feb 19, 2003
filing date -
Aug 25, 2000
priority date (Note) -
Expired
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Abstract
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 high-sensitive material 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 conventional optical system, illuminating an area of the 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. The hologram is only written in the portion where the signal and the reference beams overlap.
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