Patent ID: 7791779

Claim:
A hologram recording apparatus that records a hologram on a recording layer of a hologram recording medium by causing interference between signal light modulated in accordance with record data and reference light from the same light source as that of the signal light, the hologram recording apparatus comprising: a signal light spatial light modulating section that displays a signal light pattern for causing the signal light; a reference light spatial light modulating section that displays a reference light pattern for causing the reference light; a control section that controls: (a) a first form of the signal light pattern to be displayed on the signal light spatial light modulating section; (b) a second form of the reference light pattern to be displayed on the reference light spatial light modulating section; and (c) optical energy of the signal light and reference light; and a temperature sensor that senses a temperature of the hologram recording medium, wherein the control section irradiates a predefined amount of optical energy to the hologram recording medium in accordance with the temperature of the hologram recording medium at the time of recording such that a diffraction efficiency of diffracted light caused by irradiation of the reference light to the hologram after recording can be equal to a predetermined value.