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Apparatus and method for holographic information storage and retrieval

A holographic information, holographic technology, applied in the field of storing and reproducing information encoded in holographic data storage media

Inactive Publication Date: 2007-10-31
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The theoretical limit to the storage density of this technology is on the order of tens of terabits per cubic centimeter

Method used

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  • Apparatus and method for holographic information storage and retrieval
  • Apparatus and method for holographic information storage and retrieval
  • Apparatus and method for holographic information storage and retrieval

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Embodiment Construction

[0018] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, like reference numerals indicate the same or similar elements. All references in this specification to "one embodiment," "an embodiment," or similar language mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, all appearances of the phrases "in one embodiment," "in an embodiment," and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment.

[0019] The features, structures or characteristics described herein may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the invention. It will be understood, however, by one skill...

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Abstract

An apparatus and an method for holographic information storage and retrieval are disclosed. The holographic information recording apparatus comprises a laser light source, a beam splitter, and a reflective spatial light modulator. The beam splitter provides a reference beam and a carrier beam, where that reference beam is directed without reflection toward a holographic data storage medium. The carrier beam is reflected off the reflective spatial light modulator to form a data beam comprising an image of information. The reference beam interacts with the data beam to form a hologram comprising the image. That hologram is then encoded in a holographic data storage medium.

Description

technical field [0001] The present invention relates to an apparatus and method of using the apparatus to store and reproduce information encoded in a holographic data storage medium. Background technique [0002] In holographic information storage, an entire page of information is stored at once in a thick, light-sensitive optical material as an optical interference pattern. This is achieved by crossing two coherent laser beams in the storage material. The first beam, called the data beam, contains the information to be stored; the second beam, called the reference beam, is designed to be easily reproducible, such as a simple collimated beam with a planar wavefront. [0003] The resulting optical interference pattern of the two coherent laser beams induces chemical and / or physical changes in the photosensitive medium: a copy of the interference pattern is stored as a change in the absorption, refractive index or thickness of the photosensitive medium. When the stored inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/0065G11B7/09G03H1/22G11B7/125G11B7/135
CPCG03H1/04G03H2225/52G11B7/0065G03H1/0402G11B7/1369G11B7/128
Inventor 丹尼尔·詹姆斯·威纳尔斯基艾伦·凯斯·贝茨刘铮克莱格·安托尼·克莱恩尼尔斯·豪斯坦
Owner IBM CORP