OPTICAL INFORMATION RECORDING DEVICE, AND OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE

摘要

PROBLEM TO BE SOLVED: To record or reproduce information by utilizing holography, and to make it possible to constitute an optical system small without decreasing an information amount.

SOLUTION: When recording, an information recording layer 3 as a recording medium is irradiated with information light 61 generated by a spatial light modulator and recording reference light 62 generated by a phase spatial light modulator through a two-split optical rotary plate 32 from one surface side so as to be coaxial and also minimized in diameter on a reflection surface 5a, and the information is recorded on the information recording layer 3. The plate 32 rotates the transmission light in the directions different in each area splitting the cross-section of the light flux in two. The plate 32 is located at the position conjugated with that of the spatial light modulator. Moreover, the phase spatial light modulator is located at the position conjugated with that of the plate 32.

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