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    Hologram recording apparatus and method therefor
    1.
    发明授权
    Hologram recording apparatus and method therefor 失效
    全息记录装置及其方法

    公开(公告)号：US06535472B1

    公开(公告)日：2003-03-18

    申请号：US09631646

    申请日：2000-08-02

    申请人： Myeongkyu Lee ,  Kenji Kitamura ,  Yasunori Furukawa ,  Shunji Takekawa ,  Hideki Hatano

    发明人： Myeongkyu Lee ,  Kenji Kitamura ,  Yasunori Furukawa ,  Shunji Takekawa ,  Hideki Hatano

    IPC分类号： G11B700

    CPC分类号： G11B7/1275 ,  G03H2001/026 ,  G03H2001/0268 ,  G11B7/0025 ,  G11B7/0065 ,  G11B7/243 ,  G11B2007/0009 ,  G11B2007/24306 ,  G11B2007/2432

    摘要： A hologram recording apparatus is capable of directing interferable signal light and reference light into a hologram recording medium to record an information signal carried by the signal light. The hologram recording medium is sensitive to a first light at a first wavelength in an ultraviolet or short-wavelength visible light band to develop light induced absorption. The apparatus includes a light source for irradiating the hologram recording medium with the first light, and a laser light source for irradiating the hologram recording medium with signal light and reference light at a second wavelength longer than the first wavelength after the first light is irradiated.

    摘要翻译： 全息记录装置能够将干涉信号光和参考光引导到全息图记录介质中，以记录由信号光携带的信息信号。 全息图记录介质对紫外或短波长可见光波段中的第一波长的第一光敏感，以产生光吸收。 该装置包括用于照射第一光的全息图记录介质的光源和用于在第一光照射之后以比第一波长长的第二波长的信号光和参考光照射全息图记录介质的激光光源。

    Two-color hologram recording/reproducing apparatus
    2.
    发明授权
    Two-color hologram recording/reproducing apparatus 失效
    双色全息记录/再现装置

    公开(公告)号：US06373806B1

    公开(公告)日：2002-04-16

    申请号：US09630763

    申请日：2000-08-02

    申请人： Kenji Kitamura ,  Yasunori Furukawa ,  Shunji Takekawa ,  Myeongkyu Lee ,  Satoru Tanaka ,  Takashi Yamaji ,  Hideki Hatano

    发明人： Kenji Kitamura ,  Yasunori Furukawa ,  Shunji Takekawa ,  Myeongkyu Lee ,  Satoru Tanaka ,  Takashi Yamaji ,  Hideki Hatano

    IPC分类号： G11B700

    CPC分类号： G11B7/0025 ,  G03H2001/026 ,  G03H2001/0268 ,  G11B7/0065 ,  G11C13/042

    摘要： A two-color hologram recording/reproducing apparatus is capable of directing interferable signal light and reference light into a hologram recording medium to record an information signal carried by the signal light. The hologram recording medium is sensitive to a first light at a first wavelength in an ultraviolet or short-wavelength visible light band to develop light induced absorption. The apparatus includes a light source for irradiating the hologram recording medium with the first light, a laser light source for irradiating the hologram recording medium with signal light and reference light at a second wavelength longer than the first wavelength after the first light is irradiated, and a gate light source for directing gate light at a third wavelength into the hologram recording medium. The gate light causes the hologram recording medium to develop a recording sensitivity to activate or inactivate a refractive index grating in accordance with existence or non-existence of a light interference pattern formed by the signal light and the reference light.

    摘要翻译： 双色全息记录/再现装置能够将干涉信号光和参考光引导到全息图记录介质中，以记录由信号光携带的信息信号。 全息图记录介质对紫外或短波长可见光波段中的第一波长的第一光敏感，以产生光吸收。 该装置包括用于照射第一光的全息图记录介质的光源，用于在第一光照射之后以比第一波长长的第二波长的信号光和参考光照射全息图记录介质的激光光源，以及 用于将第三波长的栅极光引导到全息图记录介质中的栅极光源。 栅极光使得全息图记录介质产生记录灵敏度，以根据由信号光和参考光形成的光干涉图案的存在或不存在来激活或失活折射率光栅。

    Photorefractive material
    3.
    发明授权
    Photorefractive material 失效
    光折射材料

    公开(公告)号：US06670079B1

    公开(公告)日：2003-12-30

    申请号：US09598222

    申请日：2000-06-21

    申请人： Kenji Kitamura ,  Yasunori Furukawa ,  Shunji Takekawa ,  Myeongkyu Lee ,  Hideki Hatano ,  Satoru Tanaka ,  Takashi Yamaji

    发明人： Kenji Kitamura ,  Yasunori Furukawa ,  Shunji Takekawa ,  Myeongkyu Lee ,  Hideki Hatano ,  Satoru Tanaka ,  Takashi Yamaji

    IPC分类号： G03H103

    CPC分类号： G11C13/045 ,  G03H2260/54

    摘要： A photorefractive material provides a high photosensitivity without reduction. The material comprises a single crystal of terbium (Tb)-doped niobate or tantalate. The single crystal is a single crystal of lithium niobate (LiNbO3) whose molar fraction of [Li2O]/([Li2O]+[Nb2O5]) lies in a range of 0.482 to 0.505, or a single crystal of lithium tantalate (LiTaO3) whose molar fraction of [Li2O]/([Li2O]+[Ta2O5]) lies in a range of 0.482 to 0.505. The amount of terbium added in the photorefractive material ranges from 10 weight ppm to 1000 weight ppm.

    摘要翻译： 光折射材料提供高的光敏性而不会减少。 该材料包括铽（Tb）掺杂的铌酸盐或钽酸盐的单晶。 该单晶是其[Li 2 O] /（[Li 2 O] + [Nb 2 O 5]）的摩尔分数在0.482〜0.505的范围内的铌酸锂（LiNbO 3）的单晶，或者是钽酸锂（LiTaO 3）的单晶， [Li 2 O] /（[Li 2 O] + [Ta 2 O 5]）的摩尔分数在0.482〜0.505的范围内。 在光折射材料中添加的铽的量为10重量ppm至1000重量ppm。