Patent ID: 7184183

Claim:
A hologram recording apparatus for recording an interference fringe, generated by interference of a first light beam subjected to spatial light modulation by recording data with a second light beam, in a recording area of a hologram recording medium, said hologram recording apparatus comprising: a random phase body configured to randomize the wave front of said second light beam, and a multiplex recording control unit configured to record said interference fringe of said first light beam and said second light beam in the same recording area of said hologram recording medium each time said random phase body is rotated by a predetermined angle θ, wherein θ>2σ/r, σ is an autocorrelation length of a speckle pattern on said recording area irradiated with said second light beam, and r is a distance measured along said random phase body, from a central optical axis of said second light beam to an edge of said second light beam.