| 摘要 |
<p>A holographic recording and reproducing method for recording data in a holographic recording medium comprising a recording layer (18) and a servo layer disposed on the opposite side of the recording layer as viewed in the direction of signal beam incidence on the holographic recording medium and having regions in which servo projections (16) are formed. The method includes steps of setting an optical path of the signal beam (12) so that the signal beam is projected onto other regions (17) of the servo layer than the regions formed with the servo projections, setting an optical path of a servo beam (10) different from that of the signal beam so that the servo beam is projected onto one of the regions of the servo layer in which the servo projections are formed after passing through an objective lens (14) through which the signal beam passes and projecting the servo beam onto the servo layer along the thus set optical path of the servo beam. Noise is thereby reduced.
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