| 摘要 |
PROBLEM TO BE SOLVED: To provide a hologram reproducing method by which, when data are rewritten, crosstalk by the original data is prevented and reproduction light with little noise and a high S/N ratio can be obtained as well as to provide a hologram recording method by which rewriting of data can be performed at a high speed without passing through an erasing step. SOLUTION: In a prescribed recording area of an optical recording medium in which a hologram concerned with first data has been recorded, a hologram concerned with second data is overwritten and recorded under conditions which generate reproduction light in a polarized state different from the polarized state of reproduction light obtained from the hologram concerned with the first data. COPYRIGHT: (C)2005,JPO&NCIPI
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