| 摘要 |
A hologram apparatus capable of recording and reproduction of a recording medium with stability. The hologram apparatus includes: a suspension unit for holding a recording medium in a freely mountable fashion, the recording medium storing an optical interference pattern inside as a diffraction grating; a reference light optical system for emitting reference light toward the recording medium; and a signal light optical system for emitting signal light toward the recording medium, being arranged on a side opposite from the reference light optical system coaxially across the recording medium, the diffraction grating being formed by opposite irradiation of the recording medium with the signal light and the reference light. The hologram apparatus has: an objective lens for condensing the reference light with a first numerical aperture; and a spatial light modulation device for generating the signal light from the reference light past the recording medium and making it pass through the recording medium with a second numerical aperture different from the first numerical aperture, the signal light being modulated according to recorded information.
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