Patent ID: 7794896
Filing Date: 2010-09-14
Classification: G11B,Y10S

Abstract:
1. A method of making a holographic data storage medium, said method comprising: (a) providing an optically transparent substrate comprising at least one photochemically active polymeric diarylethene dye based upon polycarbonate; and (b) irradiating the optically transparent substrate at least one wavelength at which the optically transparent substrate has an absorbance in a range from about 0.1 to 1, said at least one wavelength being in a range from about 300 nanometers to about 800 nanometers, to produce a modified optically transparent substrate comprising at least one optically readable datum and at least one photo-product of the photochemically active polymeric diarylethene dye based upon polycarbonate, wherein the optically transparent substrate is at least 100 micrometers thick and comprises the photochemically active dye in an amount corresponding to from about 0.1 to about 10 weight percent based on a total weight of the optically transparent substrate.