Patent ID: 7436749

Claim:
A hologram recording and reproduction apparatus for recording interference fringes produced by interference of a spatially optically modulated first light beam and a second light beam in a recording area of a hologram recording medium, comprising: a randomizing phase member for disturbing a wave front of the second light beam at random; and an optical axis coupling optical system for coupling the spatially optically modulated first light beam and the second light beam having the randomly disturbed wave front so as to have a common optical axis and propagate in the same direction, further comprising an image pickup device for receiving diffracted light, which is generated by the hologram recording medium when the second light beam having the optical axis common to the optical axis of the first light beam is illuminated solely on the hologram recording medium, to obtain a reproduction signal and a light beam removing device for removing the second light beam from the diffracted light, and further comprising an optical lens for causing the second light beam having the randomly disturbed wave front and the spatially optically modulated first light beam to be condensed in different condensation states from each other at the position of the hologram recording medium.