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AssigneeKabushiki Kaisha Toshiba
InventorsKouichi Ichimura, Kazushige Yamamoto, Nobuhiro Gemma
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A method of recording information in an optical recording medium, which comprises two steps. In the first step, a coherent light pulse train which resonates with a transition between the first and third energy levels and coherent light which resonates with a transition between the second and third energy levels or a transition between the first and second energy levels are applied to the optical recording medium, thereby causing the light pulse train to pass through the optical recording medium. In the second step, an intensity change of an external field is supplied to the medium, while the light pulse train is passing through the optical recording medium, thereby fixing sites in a thickness direction of the medium, at which the absorption spectrum of the medium is changed.
An optical recording medium made of a solid-state material having three energy levels in which the lowest energy level is referred to as a first energy level and the other energy levels are referred to as a second and a third energy levels, the material undergoes a change in absorption spectrum when irradiated with light comprised of photons having energy approximately equal to a transition energy between the first and the third energy levels, and retains said change in absorption spectrum after irradiation of the light is stopped.
Dependencies are inferred from the claim text.