Patent ID: 7901839
Filing Date: 2011-03-08
Classification: G03C,G03H,G11B

Abstract:
1. A method for storing holographic data comprising: (A) providing a holographic storage medium comprising an optically transparent substrate, said optically transparent substrate comprising a photochemically active dye having structure (V) wherein R 1 is independently at each occurrence a C 1 -C 20 aliphatic radical, a C 3 -C 20 cycloaliphatic radical, or a C 2 -C 30 aromatic radical; R 2 , R 3 , and R 4 are independently at each occurrence hydrogen, deuterium, a C 1 -C 20 aliphatic radical, a C 3 -C 20 cycloaliphatic radical, or a C 2 -C 30 aromatic radical; “a” is an integer from 2 to 4; and has a decompositon temperature greater than 250° C.; and (B) irradiating the optically transparent substrate with a holographic interference pattern, wherein the pattern has a first wavelength and an intensity both sufficient to convert, within a volume element of the substrate, at least some of the photochemically active dye into a photo-product, and producing within the irradiated volume element concentration variations of the photo-product corresponding to the holographic interference pattern, thereby producing an optically readable datum corresponding to the volume element.