Patent ID: 7012722

Claim:
A holographic recording apparatus comprising: a light source for generating a coherent reference light beam; a signal light generation unit including a spatial light modulator for spatially modulating the reference light beam in accordance with information data to generate a signal light beam; an interference unit for directing the signal light beam and the reference light beam toward a recording medium through an objective lens to form a region of a diffraction grating by an optical interference pattern within the recording medium; a lens positioning unit for positioning the objective lens with respect to a recording surface of the recording medium; and a light-receiving unit for detecting a returned beam that is returned from the recording medium through the objective lens, wherein the signal light generation unit includes a correction unit for detecting an amount of a optical positional offset between a recording data setting area in the spatial light modulator being supplied with said information data and an aperture area of the objective lens, and for adjusting a position of the recording data setting area in accordance with the amount of a optical positional offset.