OPTICAL INFORMATION RECORDING DEVICE AND METHOD, OPTICAL INFORMATION REPRODUCING DEVICE AND METHOD, AND OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE AND METHOD

摘要

An object of the present invention is to record and reproduce information through the use of holography, and achieve compact configuration of an optical system with no reduction in the amount of information. For recording, a spatial light modulator (25) generates information light and a phase spatial light modulator (17) generates recording-specific reference light having a spatially modulated phase. The information light and the recording-specific reference light are projected onto one side of an information recording layer (3) of an optical information recording medium (1) coaxially so as to converge on a reflecting surface. At the time of recording of information, P-polarized recording-specific reference light and S-polarized information light are each optically rotated by a two-way split optical rotation plate (21) in directions different between respective half areas of the cross section of the beam thereof. An interference pattern resulting from interference between the information light yet to impinge on the reflecting surface and the recording-specific reference light reflected by the reflecting surface and an interference pattern resulting from interference between the recording-specific reference light yet to impinge on the reflecting surface and the information light reflected by the reflecting surface are recorded in the information recording layer (3).