| 摘要 |
PROBLEM TO BE SOLVED: To enable stable recording by sinking a recording medium into a liquid of a refractive index equal to or nearly equal to a refractive index of a transparent substrate, and recording information to a recording layer. SOLUTION: A hologram memory 1 is set to a holding device 22 in a container 21, and a liquid 24 having a refractive index nearly equal to a refractive index of transparent substrates 3 and 4 is injected to the container 21. The hologram memory 1 is made to completely soak in the liquid 24 and moreover soak in the liquid 24 up to each projection opening of a signal beam irradiation device 23A and a reference beam irradiation device 23B. A signal beam 10 and a reference beam 11 are emitted to the hologram memory 1 from the signal beam irradiation device 23A and reference beam irradiation device 23B. Each of the irradiating beams 10 and 11 advances in the liquid 24, hits the transparent substrate 3 of the hologram memory 1, passes into the transparent substrate 3 without being reflected at the interface between the liquid 24 and the transparent substrate 3, and intersects at a predetermined point in a recording layer 2, whereby information is recorded as a hologram.
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