公开(公告)号：US06473208B1

公开(公告)日：2002-10-29

申请号：US09598382

申请日：2000-06-21

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

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

IPC分类号： G03H103

CPC分类号： G03H1/0248 ,  G03H2001/026 ,  G03H2001/0268 ,  G11B7/0065

摘要： A two-color holographic recording apparatus reduces error signals possibly included in reproduced digital data signals. The two-color holographic recording apparatus has first, second and third light shutters for passing or blocking gate light, signal light and reference light incident on a recording medium respectively, and a controller for controlling the respective states of the first, second and third light shutters.

摘要翻译： 双色全息记录装置减少可能包含在再现的数字数据信号中的误差信号。 双色全息记录装置具有分别用于通过或阻挡入射在记录介质上的栅极光，信号光和参考光的第一，第二和第三光闸，以及用于控制第一，第二和第三光的各自状态的控制器 百叶窗。

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。

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。

公开(公告)号：US06320683B1

公开(公告)日：2001-11-20

申请号：US09538154

申请日：2000-03-29

申请人： Yoshihisa Ito ,  Tomomitsu Kouno ,  Hideki Hatano ,  Takashi Yamaji ,  Satoru Tanaka ,  Hajime Matsushita

发明人： Yoshihisa Ito ,  Tomomitsu Kouno ,  Hideki Hatano ,  Takashi Yamaji ,  Satoru Tanaka ,  Hajime Matsushita

IPC分类号： G03H126

CPC分类号： G11B7/08564 ,  G03H1/26 ,  G03H1/265 ,  G03H2001/026 ,  G03H2001/0268 ,  G11B7/0065

摘要： A description is provided of an optical information recording and reproducing apparatus which detachably supports a volume holographic memory formed of a photorefractive crystal. The apparatus includes a portion for supplying a coherent reference light beam at a first wavelength into the volume holographic memory; a portion for supplying a coherent signal light beam at the first wavelength, modulated in accordance with image data, into the memory to produce an optical interference pattern with the reference light within the memory; a portion for supplying a gate light beam at a second wavelength into the memory for activating or deactivating an index grating in accordance with the presence or absence of the optical interference pattern to enhances a photo-sensitivity of the memory; and a detector for detecting diffraction light from the index grating of the memory by the irradiation of the reference light beam. The apparatus includes a scanning portion for moving an intersecting region in which the gate light beam, the signal light beam and the reference light beam intersect with one another within the volume holographic memory along an optical axis of an optical path of the signal light beam within the volume holographic memory.

摘要翻译： 提供了可拆卸地支撑由光折射晶体形成的体积全息存储器的光学信息记录和再现装置的描述。 该装置包括用于将第一波长的相干参考光束提供到体积全息存储器中的部分; 用于将根据图像数据调制的第一波长的相干信号光束提供到存储器中以产生与存储器内的参考光的光学干涉图案的部分; 用于根据存在或不存在光学干涉图案来将第二波长的栅极光束提供到存储器中用于激活或去激活索引光栅的部分，以增强存储器的光敏性; 以及用于通过照射参考光束来检测来自存储器的索引光栅的衍射光的检测器。 该装置包括扫描部分，用于移动其中栅极光束，信号光束和参考光束沿着信号光束的光路的光轴在体积全息存储器内彼此相交的相交区域 体积全息记忆体。

公开(公告)号：US06594220B1

公开(公告)日：2003-07-15

申请号：US09396663

申请日：1999-09-15

申请人： Hajime Matsushita ,  Tomomitsu Kouno ,  Hideki Hatano ,  Yoshihisa Itoh ,  Satoru Tanaka ,  Takashi Yamaji ,  Fumitaka Kotaka

发明人： Hajime Matsushita ,  Tomomitsu Kouno ,  Hideki Hatano ,  Yoshihisa Itoh ,  Satoru Tanaka ,  Takashi Yamaji ,  Fumitaka Kotaka

IPC分类号： G11B700

CPC分类号： G11B7/1378 ,  G03H1/0248 ,  G03H1/265 ,  G03H2260/54 ,  G11B7/0025 ,  G11B7/0065 ,  G11B7/24

摘要： A volume holographic memory for recording three-dimensional distribution of interference fringes generated owing to interference between signal light and reference light is provided, wherein the volume holographic memory is formed into a cylindrical shape. Also an optical information recording/reproducing apparatus is provided which incorporates an interference-fringe generating unit for generating interference fringes formed owing to interference between signal light and reference light; a storage unit for storing three-dimensional distribution of the interference fringes generated by the interference-fringe generating unit; a detecting unit for detecting diffracted light obtainable from the storage unit by irradiating the storage unit with reference light; and a reproducing unit for reproducing signal light from diffracted light detected by the detecting unit, wherein the storage unit is constituted by a volume holographic memory having a cylindrical shape.

摘要翻译： 提供用于记录由信号光和参考光之间的干涉而产生的干涉条纹的三维分布的体积全息存储器，其中体积全息存储器形成为圆柱形。 还提供了一种光信息记录/再现装置，其包括干涉条纹产生单元，用于产生由于信号光和参考光之间的干扰而形成的干涉条纹; 存储单元，用于存储由干涉条纹生成单元生成的干涉条纹的三维分布; 检测单元，用于通过用参考光照射存储单元来检测从存储单元获得的衍射光; 以及再现单元，用于再现由检测单元检测到的衍射光的信号光，其中存储单元由具有圆柱形状的体积全息存储器构成。

公开(公告)号：US06490061B1

公开(公告)日：2002-12-03

申请号：US09540202

申请日：2000-03-31

申请人： Satoru Tanaka ,  Tomomitsu Kouno ,  Hideki Hatano ,  Yoshihisa Itoh ,  Hajime Matsushita ,  Takashi Yamaji

发明人： Satoru Tanaka ,  Tomomitsu Kouno ,  Hideki Hatano ,  Yoshihisa Itoh ,  Hajime Matsushita ,  Takashi Yamaji

IPC分类号： G03H126

CPC分类号： G11B7/0025 ,  G03H1/0248 ,  G03H1/26 ,  G03H1/265 ,  G03H2001/0232 ,  G03H2260/54 ,  G11B7/0065 ,  G11C13/042

摘要： A description is provided of an optical information recording and reproducing apparatus. The apparatus comprises: a holographic memory made of a photorefractive crystalline material; a support portion for detachably supporting the memory; a reference beam supplying portion for supplying a coherent reference beam of a first wavelength incident on the memory; a signal beam generating portion for supplying a coherent signal beam of the first wavelength, which is modulated in accordance with image data, incident on the memory, intersecting therein the signal beam with the reference beam, and generating a three-dimensional interference pattern of the beams; a detecting portion for detecting a diffracted light from a refractive index grating of the interference pattern in the memory, due to irradiation of the reference beam; and a medium position adjusting portion for moving a position of the support portion in accordance with a signal corresponding to positioning images from the detection portion. The memory includes a nonvolatile refractive index grating corresponding to a three-dimensional interference pattern of a coherent reference beam and a coherent signal beam, the coherent signal beam being modulated in accordance with positioning images.

摘要翻译： 提供了光学信息记录和再现装置的描述。 该装置包括：由光折射晶体材料制成的全息存储器; 用于可拆卸地支撑存储器的支撑部分; 参考光束供应部分，用于提供入射在存储器上的第一波长的相干参考光束; 信号光束产生部分，用于提供入射到存储器上的根据图像数据调制的第一波长的相干信号光束，信号光束与参考光束相交，并产生三维干涉图案 梁; 检测部，其由于参照光束的照射，检测来自存储器中的干涉图案的折射率光栅的衍射光; 以及介质位置调节部分，用于根据与来自检测部分的定位图像相对应的信号来移动支撑部分的位置。 存储器包括对应于相干参考光束和相干信号光束的三维干涉图案的非易失性折射率光栅，相干信号光束根据定位图像进行调制。

公开(公告)号：US06900914B1

公开(公告)日：2005-05-31

申请号：US09538149

申请日：2000-03-29

申请人： Satoru Tanaka ,  Tomomitsu Kouno ,  Hideki Hatano ,  Yoshihisa Itoh ,  Hajime Matsushita ,  Takashi Yamaji

发明人： Satoru Tanaka ,  Tomomitsu Kouno ,  Hideki Hatano ,  Yoshihisa Itoh ,  Hajime Matsushita ,  Takashi Yamaji

IPC分类号： G11B7/00 ,  G03H1/04 ,  G03H1/22 ,  G03H1/26 ,  G11B7/0025 ,  G11B7/0065 ,  G11B7/135 ,  G03H1/02

CPC分类号： G03H1/0248 ,  G03H1/26 ,  G03H1/265 ,  G03H2001/0268 ,  G11B7/0025 ,  G11B7/0065 ,  G11B7/135 ,  G11B2007/0009

摘要： A description is provided of an optical information recording and reproducing apparatus having a volume holographic memory. The apparatus is capable of recording an interference pattern in the volume holographic memory in high density and can be made small-sized. The apparatus includes a comprises support portion for detachably supporting the volume holographic memory, which is made of a photorefractive crystalline material; a reference beam supplying portion for making a coherent reference beam of a first wavelength incident on the volume holographic memory; a signal beam generating portion for making a coherent signal beam of the first wavelength, which is modulated in accordance with image data, incident on the volume holographic memory, intersecting therein the signal beam with the reference beam, and generating a three-dimensional light interference pattern of the signal beam and the reference beam; and detecting a portion for detecting diffracted light from a refractive index grid of the light interference pattern in the volume holographic memory, due to irradiation of the reference beam. The signal beam and the reference beam are arranged in a plane having a normal line perpendicular to the symmetrical axis of rotation of the volume holographic memory.

摘要翻译： 提供具有体积全息存储器的光学信息记录和再现装置的描述。 该装置能够以高密度在体积全息存储器中记录干涉图案，并且可以制成小尺寸。 该装置包括：包括用于可拆卸地支撑体积全息存储器的支撑部分，其由光折射晶体材料制成; 用于使第一波长的相干参考光束入射到体积全息存储器上的参考光束供应部分; 信号光束产生部分，用于使入射到体积全息存储器上的根据图像数据调制的第一波长的相干信号光束与信号光束与参考光束相交，并产生三维光干涉 信号光束和参考光束的图案; 并且由于参考光束的照射，检测用于检测来自体积全息存储器中的光干涉图案的折射率栅格的衍射光的部分。 信号光束和参考光束被布置在具有垂直于体积全息存储器的对称旋转轴线的法线的平面中。

公开(公告)号：US06862120B2

公开(公告)日：2005-03-01

申请号：US10098616

申请日：2002-03-18

申请人： Satoru Tanaka ,  Hajime Matsushita ,  Yoshihisa Itoh ,  Tomomitsu Kouno ,  Hideki Hatano

发明人： Satoru Tanaka ,  Hajime Matsushita ,  Yoshihisa Itoh ,  Tomomitsu Kouno ,  Hideki Hatano

IPC分类号： G03H1/02 ,  G03H1/04 ,  G03H1/30 ,  G11B7/00 ,  G11B7/0065 ,  G11C13/04

CPC分类号： G11C13/042 ,  G03H1/02 ,  G03H1/0248 ,  G03H1/26 ,  G03H2001/0268 ,  G03H2001/0413 ,  G03H2001/183 ,  G03H2222/34 ,  G03H2222/56 ,  G03H2223/14 ,  G03H2260/54 ,  G11B7/0065 ,  G11B2007/0009

摘要： In a hologram recording method for forming a plurality of areas of a refractive index light interference pattern of a coherent signal light beam in accordance with information data within a recording medium having a shape of parallel flat plates, the signal light beam and the recording reference light beam cross each other within the recording medium, and a gate light beam having a second wavelength for revealing recording sensitivity of the recording medium is simultaneously irradiated to the recording medium so as to pass through a portion of the recording reference light beam and demarcate a volume smaller than that of this crossing portion.

摘要翻译： 在根据具有平行平板形状的记录介质内的信息数据形成相干信号光束的折射率光干涉图案的多个区域的全息图记录方法中，信号光束和记录参考光 光束在记录介质内彼此交叉，并且具有用于显示记录介质的记录灵敏度的第二波长的栅极光束被同时照射到记录介质上，以便通过记录参考光束的一部分并且划定体积 小于该交叉部分的面积。

公开(公告)号：US06301028B1

公开(公告)日：2001-10-09

申请号：US09533763

申请日：2000-03-23

申请人： Satoru Tanaka ,  Tomomitsu Kouno ,  Hideki Hatano ,  Yoshihisa Itoh ,  Hajime Matsushia ,  Takashi Yamaji

发明人： Satoru Tanaka ,  Tomomitsu Kouno ,  Hideki Hatano ,  Yoshihisa Itoh ,  Hajime Matsushia ,  Takashi Yamaji

IPC分类号： G03H126

CPC分类号： G03H1/265 ,  G03H1/26 ,  G03H2001/026 ,  G03H2001/0268 ,  G03H2223/12 ,  G11B7/0025 ,  G11B7/0065

摘要： A description is provided of an optical information recording and reproducing apparatus employing a holographic memory. The apparatus includes a mask disposed in an optical path of the signal light beam so as to cover a light intensity distribution of the signal light beam incident into the holographic memory at nearly a half portion thereof with respect to the center of the distribution of the zeroth-order diffracted light of the signal light beam. The center of a region of the holographic memory where the signal light beam and the reference light beam intersect with each other, is shifted by a distance substantially equal to twice the distance between peaks of the zeroth-order diffracted light or the first-order diffracted light of the signal light beam.

摘要翻译： 提供了使用全息存储器的光学信息记录和再现装置的描述。 该装置包括设置在信号光束的光路中的掩模，以便覆盖入射到全息存储器中的相对于零分布的中心的近半部分的信号光束的光强度分布 信号光束的衍射光。 信号光束和参考光束彼此相交的全息存储器的区域的中心偏移大致等于零级衍射光或第一级衍射光的峰值之间的距离的两倍 信号光束的光。

公开(公告)号：US06256281B1

公开(公告)日：2001-07-03

申请号：US09275430

申请日：1999-03-24

申请人： Satoru Tanaka ,  Takashi Yamaji ,  Hideki Hatano

发明人： Satoru Tanaka ,  Takashi Yamaji ,  Hideki Hatano

IPC分类号： G11B700

CPC分类号： G03H1/0248 ,  G11C13/042

摘要： A volume holographic memory-based optical information-recording/reproducing apparatus being capable of controlling an interference area formed by a reference beam and a signal beam within a recording medium more easily than by waveform shaping using a lens. A recording medium is installed in the apparatus for recording a three-dimensional optical interference pattern formed by at least two coherent light beams as spatial changes in refractive index of the recording medium. A signal beam optical system transmits a coherent signal beam to the recording medium through a Fourier transform lens. A reference beam optical system transmits a coherent reference beam to the recording medium. The reference beam intersects the signal beam within the recording medium, and an angle of intersection between the reference beam and the signal beam is changed. Diffracted light of the reference beam diffracted from the recording medium is detected. Light intensity distribution-offset element is arranged in both of optical paths of the signal and reference beam optical systems, for controlling a distribution of a light intensity of the signal beam and a light intensity of the reference beam, respectively, within an area in the recording medium in which the signal beam and the reference beam intersect with each other.

摘要翻译： 一种基于体积全息存储器的光学信息记录/再现装置，其能够比通过使用透镜的波形整形更容易地控制由记录介质内的参考光束和信号光束形成的干涉区域。 记录介质安装在用于记录由至少两个相干光束形成的三维光学干涉图案的装置中，作为记录介质的折射率的空间变化。 信号光束光学系统通过傅立叶变换透镜将相干信号光束传输到记录介质。 参考光束光学系统将相干参考光束传输到记录介质。 参考光束与记录介质内的信号光束相交，参考光束和信号光束之间的交点变化。 检测从记录介质衍射的参考光束的衍射光。 光强分布偏移元件被布置在信号和参考光束光学系统的光路中，用于分别控制信号光束的光强度和参考光束的光强度的分布， 信号光束和参考光束彼此相交的记录介质。