Patent ID: 9170562
Filing Date: 2015-10-27
Classification: G03H,G11B

Abstract:
1. A holographic memory device which records an interference pattern generated by interfering a reference beam and a signal beam in a hologram recording medium as page data, comprising: a laser light source which emits a laser beam; a beam splitter which splits the laser beam emitted from the laser light source into the signal beam and the reference beam; a wavefront sensor which detects a wave aberration of the reference beam separated by the beam splitter; and a wavefront control element which corrects for the wave aberration of the reference beam in accordance with an output of the wavefront sensor; wherein when recording information in the hologram recording medium, the interference pattern generated by interfering the signal beam separated by the beam splitter and the reference beam which has passed through the wavefront control element is recorded in the hologram recording medium; further comprising a control circuit which controls the wavefront control element in accordance with the output of the wavefront sensor; wherein when the wave aberration of the reference beam output from the wavefront sensor is equal to or larger than a predetermined value, the control circuit performs recording or reproduction using the reference beam having the wave aberration corrected by the wavefront control element.