Importance

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Abstract

A holographic recording apparatus which can stably record data to be recorded onto a recording medium. The holographic recording apparatus of the present invention includes: 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 formed 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. The signal light generation unit includes correction unit for detecting an amount of an 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.

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First Claim