Holographic recording medium and holographic recording/reproducing apparatus using the same
AssigneesPioneer Corporation, National Institute For Material Science
InventorsHideki Hatano, Takashi Yamaji, Kenji Kitamura, Shunji Takekawa, Masaru Nakamura
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Abstract
A holographic recording medium exhibiting a high recording sensitivity without execution of reduction treatment. A system records information on the holographic recording medium by using a gating light within a wavelength band causing less optical damage to the holographic recording medium. The holographic recording medium includes a single crystal of lithium niobate (LiNbO3) or lithium tantalate (LiTaO3) containing Mn as a dopant.
Claims8
A two-color holographic recording medium comprising:
- a crystal body including a lithium niobate single crystal or a lithium tantalate single crystal which has substantially stoichiometric composition and is doped with only Mn in the range from 1 wt ppm to 100 wt ppm.
A holographic recording/reproducing apparatus for recording information in a two-color holographic recording medium and for reproducing information from said two-color holographic recording medium comprising:
- a first irradiation means for irradiating said two-color holographic recording medium with a gating light having a wavelength of 410 nm or shorter;
- and
- a second irradiation means for irradiating said two-color holographic recording medium with a signal light containing information to be recorded and a reference light,
- wherein said gating light has a shorter wavelength than those of said signal light and said reference light,
- wherein said two-color holographic recording medium comprises a crystal body including a lithium niobate single crystal or a lithium tantalate single crystal which has substantially stoichiometric composition and is doped with only Mn in the range from 1 wt ppm to 100 wt ppm.
A method for recording information on a two-color holographic recording medium comprising:
- providing the two-color holographic recording medium comprises a crystal body including a lithium niobate single crystal or a lithium tantalate single crystal which has substantially stoichiometric composition and is doped with only Mn in the range from 1 wt ppm to 100 wt ppm;
- irradiating the crystal body with a gating light having a wavelength of 410 nm or less;
- irradiating the crystal body with a recording light with a wavelength greater than 410 nm during the irradiation of the gating light.
Dependencies are inferred from the claim text.