OPTICAL RECORD MEDIUM, HOLOGRAM RECORD REPRODUCING METHOD, HOLOGRAM RECORD REPRODUCING DEVICE, OPTICAL RECORDER AND OPTICAL REPRODUCING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a hologram record reproducing method or the like which makes it possible to record a hologram by which an ample diffraction efficiency is achieved and read out without breakage the hologram recorded through the guided wave of a readout beam which causes an incidence upon the recording layer from the end face. SOLUTION: The light is subjected to the guided wave on the surface of a transparent substrate 11 at an incident angle greater than that of a determined value relative to this surface. A refractive index or an absorptive index is varied by the simultaneous irradiation of the signal beam and the reference beam each having a specified wavelength. The refractive index or the absorptive index varied is retained then an optical record medium 10 is used by which a recording layer 12 capable of recording the hologram is formed. When recorded, the hologram is recorded by simultaneously irradiating to the recording layer 12 the signal beam and the reference beam each having a prescribed wavelength. When reproduced, the recording layer 12 is subjected to the guided wave of a readout beam 3 of the wavelength which does not vary the refractive index or the absorptive index which is held by the recording layer 12. The hologram is reproduced by the diffracted light generated when the guided wave is forced to occur. This causes no problem with the guided wave loss upon being recorded. The recorded hologram can be reproduced without breakage upon being reproduced.