Patent ID: 7085028
Filing Date: 2006-08-01
Classification: G03H,G11B

Abstract:
1. A hologram recording apparatus comprising: a laser source emitting laser beams; a diffraction control element for receiving a laser beam emitted from the laser source and controlling a diffraction of the received laser beam before letting the laser beam exit; a diffracted light component blocking element configured to block a predetermined diffracted light component in the diffracted light emitted from the diffraction control element; and a first condensing element for condensing a diffracted light component that has not been blocked by the diffracted light component blocking element onto a hologram recording medium, wherein the diffraction control element has a plurality of individual diffraction control elements that control the diffraction of the received laser beam independently from each other and the individual diffraction control elements have even numbers of phase control elements for controlling phase differences among outgoing light from each element so that the zero order diffracted light cancel each other, resulting in zero intensity, and the diffracted light component blocking element blocks tertiary diffracted light or more in terms of an absolute value and allows secondary diffracted light in terms of an absolute value to pass by the individual diffraction control element.