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US 2002/0163872 A1Published application
Holographic digital data storage system
AssigneeDaewoo Electronics Co., Ltd.
InventorsJae-Woo Roh, Jang-Hyun Cho
Life of this patent
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Abstract
In a holographic digital data storage system, a light source generates a reference beam, a holographic optical element saves a plurality of interference patterns between the reference beam and a plurality of beams of specific sizes and a beam splitter splits each reproduced beam into a holographic signal beam and a holographic reference beam. A medium records an interference pattern between the holographic reference beam and the holographic signal beam and reflecting the holographic reference beam to generate a reflective information beam and, if only the holographic reference beam is illuminated, a displaying means displays a holographic reproduced beam for the holographic signal beam and detecting the reflective information beam.
Claims16
A holographic digital data storage system comprising:
- a light source for generating a reference beam;
- means for saving a plurality of interference patterns between the reference beam and a plurality of beams of specific sizes and, if only the reference beam is illuminated, generating a plurality of reproduced beams corresponding to the plurality of beams of specific sizes;
- means for splitting each reproduced beam into a reflected beam and a transmitted beam and assigning one of the reflected beam and the transmitted beam as a holographic reference beam;
- means for modulating the other of the reflected beam and the transmitted beam into a holographic signal beam corresponding to a holographic input signal;
- means for recording an interference pattern between the holographic reference beam and the holographic signal beam and reflecting the holographic reference beam to generate a reflective information beam, wherein the reflective information beam proceeds along an opposite direction to the holographic reference beam;
- and
- means for, if only the holographic reference beam is illuminated, displaying a holographic reproduced beam for the holographic signal beam and detecting the reflective information beam.
4 more elements
A holographic digital data storage system comprising:
- a light source for generating a reference beam;
- means for adjusting a polarization of the reference beam to generate a multiplicity of polarized beams with a multiplicity of polarization components, respectively;
- means for storing a number of interference patterns between the multiplicity of polarized beams and a number of reflective beams of specific sizes and between the multiplicity of polarized beams and holographic beams of specific sizes, wherein the holographic beams of specific sizes have the multiplicity of polarization components, and, if the multiplicity of polarized beams are illuminated, generating reflective reproduced beams corresponding to the reflective beams of specific sizes and holographic reproduced beams corresponding to the holographic beams of specific sizes, wherein the holographic reproduced beams have a multiplicity of holographic polarization components transferred through separate paths;
- means for collimating the polarization directions of the holographic reproduced beams to generate a first and a second holographic beam, wherein one of the first and the second beam is used as a holographic reference beam;
- means for modulating the other of the first and the second beam into a holographic signal beam corresponding to holographic input signals;
- means for recording an interference pattern between the holographic reference beam and the holographic signal beam and reflecting the reflective reproduced beams to generate reflective information beams, wherein the reflective information beams proceed along an opposite direction of the reflective reproduced beams;
- means for, if only the holographic reference beam is illuminated, displaying a holographic reproduced beam for the holographic signal beam and detecting the reflective information beams;
- and
- means for introducing the reflective reproduced beam into said recording means and transferring the reflective information beams into said displaying.
6 more elements
A holographic digital data storage system comprising:
- a light source for generating a reference beam;
- means for splitting the reference beam into a first and a second beam to proceed through separate paths;
- means for modulating the first beam into a holographic signal beam corresponding to holographic input signals;
- means for storing a number of interference patterns between the second beam and reflective beams of specific sizes and between the second beam and a holographic beam of specific size and, if the second beam is illuminated, generating reflective reproduced beams corresponding to the reflective beams of specific sizes and a holographic reproduced beam corresponding to the holographic beam of specific size, wherein the holographic reproduced beam functions as a holographic reference beam;
- means for recording an interference pattern between the holographic reference beam and the holographic signal beam and reflecting the reflective reproduced beams to generate reflective information beams, wherein the reflective information beams proceed along an opposite direction of the reflective reproduced beams;
- means for, if only the holographic reference beam is illuminated, displaying a holographic reproduced beam for the holographic signal beam and detecting the reflective information beam;
- and
- means for introducing the reflective reproduced beams into said recording means and turning the reflective information beams into said displaying means.
5 more elements
Dependencies are inferred from the claim text.