Holographic storage medium and reproduction of data therefrom

Details Holographic storage medium and reproduction of data therefrom Holographic storage medium and reproduction of data therefrom

1998-12-22

2000-12-12

Cabeca, John W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369103, 369284, 3692751, 359 3, 430 1, G11B 700, G11B 726, G03H 102

Patent

active

061607827

ABSTRACT:
A storage medium has at least one diffraction grating. The diffraction grating is formed as a holographic interference fringe pattern. The pattern is formed as it two-dimensionally diffracts an incident light beam in a plurality of directions or one-dimensionally diffracts an incident light beam in a direction. A combination of such patterns and also a plurality of rows of such patterns on the storage medium are available. A light beam is radiated to the storage medium. The light beam diffracted in the direction(s) is detected by a photodetector, such as a CCD device, that generates a signal carrying data stored as the holographic interference fringe pattern. The signal is then decoded by a processor to reproduce the data.

REFERENCES:
patent: 4440839 (1984-04-01), Mottier
patent: 4999234 (1991-03-01), Cowan
patent: 5138604 (1992-08-01), Umeda et al.
patent: 5379131 (1995-01-01), Yamazaki
patent: 5422873 (1995-06-01), Kewitsch et al.
patent: 5657340 (1997-08-01), Lehureau
patent: 5784200 (1998-07-01), Modegi

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