| 摘要 |
There is provided an information processing device which is capable of suppressing generation of stray light at the time of recording and reproduction of information, thus enabling quality information recording and reproduction. The information processing device includes: a radiation light source 2 ; and a converging section for converging rays emitted from the light source toward an information recording medium having a photosensitive layer 11 b, wherein the converging section splits the rays into first and second rays 3 ' and 3 respectively traveling through first and second spaces as divided by a plane at least containing a point optical axis L, and converges the first and second rays 3 ' and 3 onto first and second points 12 ' and 12 in the information recording medium 11 , the photosensitive layer 11 b being interposed between the first and second points 12 ' and 12 . Between the first and second points 12 ' and 12 , the first and second rays 3 ' and 3 interfere with each other to form interference fringes, the interference fringes representing information to be recorded in the photosensitive layer 11 b of the information recording medium 11.
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