Non-destructive readout scheme for holographic storage system

Details Non-destructive readout scheme for holographic storage system Non-destructive readout scheme for holographic storage system

G - Physics

03

H

88/0.14

G03H 1/04 (2006.01) G11C 13/04 (2006.01)

Patent

CA 1108898

NON-DESTRUCTIVE READOUT SCHEME FOR HOLOGRAPHIC STORAGE SYSTEM Abstract of the Invention A non-destructive readout scheme suitable for use with a holographic storage system having data stored in three spatial dimensions and one frequency dimension is described. The readout scheme and the holographic storage system use a preferred storage material which undergoes a reversible photochromic reaction involving two inhomogeneously broadened absorption bands. Information is written into the storage system by exposing the material to a holographic interference pattern of light at a frequency within either one of the two absorption bands. The non-destructive readout scheme involves reconstructing the original information by sensing the change in the index of refraction at a frequency just outside of and near either one of the two absorption bands. The read- out scheme also includes sensing refractive index changes near one or more narrow absorption lines within either absorption band.

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