Patent ID: 6468699
Filing Date: 2002-10-22
Classification: G03H,G11C

Abstract:
A method for storing nonvolatile information in a photorefractive electro-optical crystalline storage material, said method comprising the steps of:producing a first refractive index profile representing the information to be stored in said photorefractive electro-optical crystalline storage material by: modulating an object beam according to the information to be stored; and interfering a coherent object beam and a coherent reference beam within said photorefractive electro-optical crystalline storage material; and inducing a fixed replica of the first refractive index profile, the fixed replica representing the information to be stored in said storage material by irradiating with ultraviolet fixing radiation, the ultraviolet fixing radiation having an intensity sufficient to induce the fixed replica without thermal fixation wherein said steps of recording and the step of inducing a fixed replica are not overlapping.