| 摘要 |
An optical recording medium includes a transparent substrate, a recording layer formed on the transparent substrate, and a mask layer provided between the substrate and the recording layer. A material for the mask layer made of a nonlinear optical material is a photochromic compound, for example, spiropyran, spirooxazine, azobenzene, fulgide, diarylethene, triarylmethane, indigo, etc.
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