Apparatus for reading from and/or writing to holographic storage media

A technology for holographic storage and media reading, applied in optical recording/reproducing/erasing methods, using optical interference patterns for recording/reproducing/erasing, beam sources, etc., can solve problems such as complex settings and instability, and achieve Effects of setup simplification, coherence length reduction, shaking and vibration stabilization
CN101290780AInactive Publication Date: 2008-10-22THOMSON LICENSING SA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
THOMSON LICENSING SA
Publication Date
2008-10-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a device for reading from and / or writing into a holographic storage medium (15) by a simplified co-aperture configuration. According to the invention, a device for reading from and / or writing into a holographic storage medium through a coaxial arrangement of one or more reference beams (6a, 6b), a target beam (5) or restructured target beam (19), comprising one or more spatial optical modulators (10) used for modulating a light beam (2) to generate one or more reference beams (6a, 6b) through a modulating pattern (32) having a space frequency higher than that of the data page.
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Description

technical field

[0001] The present invention relates to an apparatus for reading from and / or writing to a holographic storage medium, and more particularly to an apparatus for reading from and / or writing to a holographic storage medium using a simplified common aperture setup. Device for holographic storage media. Background technique

[0002] In holographic data storage devices, digital data is stored by recording the interference pattern produced by the superposition of two coherent laser beams, where one beam (the so-called "target beam") is modulated by a spatial light modulator and carries the desired recorded information. The second beam acts as a reference beam. The interference pattern leads to a modification of specific properties of the memory material, depending on the local strength of the interference pattern. Reading of the recorded hologram is performed by irradiating the hologram with a reference beam using the same conditions as during recording. This re...

Claims

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