Patent ID: 6256281
Filing Date: 2001-07-03
Classification: G03H,G11C

Abstract:
A volume holographic memory-based optical information-recording/reproducing apparatus for recording a three-dimensional optical interference pattern formed by at least two coherent light beams on a recording medium, said interference pattern indicating spatial changes in refractive index of said recording medium, said apparatus comprising:a signal beam optical system for transmitting a coherent signal beam to said recording medium through a Fourier transform lens,a reference beam optical system for transmitting a coherent reference beam to said recording medium,means for causing said reference beam to intersect with said signal beam within said recording medium to change an angle of intersection between said reference and signal beams, andmeans for detecting diffracted light of said reference beam diffracted from said recording medium, said apparatus further comprising light intensity distribution-offset means for controlling a distribution of a light intensity of said signal beam and a light intensity of said reference beam within said recording medium in which said signal beam and said reference beam intersect with each other, said light intensity distribution-offset means provided in an optical paths of both of said signal beam optical system and said reference beam optical system, respectively.