OPTICAL RECORDING MEDIUM, RECORDING AND REPRODUCING APPARATUS, RECORDING AND REPRODUCING METHOD, REPRODUCING APPARATUS AND REPRODUCING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an optical recording medium, a recording and reproducing apparatus and the like capable of realizing high density recording without generating a problem of aberration caused by melting of the optical recording medium and a problem that a satisfactory reproducing signal can not be obtained by a photodiode.

SOLUTION: The optical recording medium 10 is constituted of a sapphire substrate 11, a non-doped GaN layer 12 and a GaN:Mg layer 13. In the recording and reproducing apparatus 30, the optical recording medium 10 is irradiated with a laser beam from a Nd:YAG laser 33 via a dichroic mirror 34 and a lens 32. When reproduction is performed, reflection light is detected by a photodetector 35 via the lens 32 and the dichroic mirror 34. The optical recording medium 10 generates photoluminescent change by receiving light having prescribed power and intensity of the reflection light is also changed according to the photoluminescent change. The photodetector 35 determines the change of the reflection light and performs reproduction of the optical recording medium 10.

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