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

Inactive Publication Date: 2008-10-22
THOMSON LICENSING SA
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  • Claims
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Problems solved by technology

Common-aperture systems allow for higher data capacities, but the setup is more complex and unstable since the target and reference beams must be split, formed and combined

Method used

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

Examples

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Embodiment Construction

[0029] In the following description, reference is made to a holographic storage system of the transmission type with two reference beams. Of course, this concept is also applicable to reflective type holographic storage systems, where data is recorded and read from only one side of the holographic storage system. Still further, only a single reference beam or more than two reference beams may be used.

[0030] figure 1 An exemplary setup of a known common aperture device for reading from and writing to a holographic storage medium is shown. For simplicity, only the chief ray of the beam is shown. A source of coherent light, eg a laser diode 1 , emits a beam 2 which is collimated, expanded and filtered by a beam expander and filter arrangement 3 . The beam 2 is then split by the beam splitter 4 into two separate beams 5 , 6 . A first beam of light 5 (the so-called "object beam") passes through a beam shutter 7 and is directed towards a spatial light modulator (SLM) 10 by tw...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/0065G03H1/12G11B7/125
CPCG11B7/128G11B7/0065
Inventor 沃尔夫冈·霍斯费尔德
Owner THOMSON LICENSING SA
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