| 摘要 |
An optical information recording and reproducing apparatus, comprising: an optical system for performing recording and reproduction using holography, including a first laser source, a spatial light modulator for generating an information and reference lights which share an optical axis from a beam of the first laser source an objective lens for condensing a beam from the modulator onto a recording medium, and a light detector for receiving a reflected light from the medium; and a servo optical system for tracking a beam condensed onto the medium by the objective lens, including a second laser source wherein a beam from the second laser source is condensed onto the medium via the objective lens, a servo light detector for receiving a reflected light from the medium based on the beam of the second laser source, and a controller for controlling the first and second laser sources so that light is emitted time-divisionally.
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