| 摘要 |
Signals are recorded as residual polarization in a recording and/or reproducing member, exhibiting ferroelectricity, and the difference in phase, dependent on the direction of residual polarization, of optical harmonics generated on illumination of a reproducing light beam, is detected by phase comparison with optical harmonics generated in a uniformly polarized reference member arranged in an optical path other than the optical path of the recording and/or reproducing member. Since the disclosed technique can use a conventional optical recording and/or reproducing technique, the disclosed technique is high in valuability as a multi-layered medium. The optical recording and/or reproducing layer can be readily implemented as a multi-layer structure to increase the recording capacity appreciably.
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