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公开(公告)号：US06104511A
公开(公告)日：2000-08-15
申请号：US116291
申请日：1998-07-16
CPC分类号： G03H1/02 , G03H1/26 , G03H1/265 , G06K19/16 , G11C13/042 , G03H2001/0216 , G03H2223/24
摘要： The holographic storage and retrieval system according to the present invention comprises one convex reflector and one concave reflector having the same optical axis. The reflective surfaces of the two reflectors are opposite each other. The concave reflector is normally larger than the convex reflector. The holographic storage medium is positioned at the focal surface of the concave reflector. The spherical reflector system according to the present invention has nearly ideal performance off-axis: high bandwidth, low aberration imaging is permitted at a number of radial and axial locations. Thus, multiple SLM/CCD pairs can be placed off-axis to access the same storage medium and implement multiple interconnects.
摘要翻译： 根据本发明的全息存储和取回系统包括一个凸反射器和一个具有相同光轴的凹面反射器。 两个反射器的反射面彼此相对。 凹面反射器通常大于凸面反射器。 全息存储介质位于凹面反射体的焦面上。 根据本发明的球面反射器系统具有离轴几乎理想的性能：在多个径向和轴向位置允许高带宽，低像差成像。 因此，多个SLM / CCD对可以离轴放置以访问相同的存储介质并实现多个互连。
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公开(公告)号：US5995251A
公开(公告)日：1999-11-30
申请号：US116752
申请日：1998-07-16
IPC分类号： G11B7/0065 , G03H1/00
CPC分类号： G11B7/0065 , G03H2210/22 , G03H2260/12
摘要： A holographic data storage apparatus having no readout lens. The apparatus has a spatial light modulator (SLM), a focusing element such as a lens, a holographic data storage material and a spatial light detector such as a CCD. The lens is located between the SLM and CCD such that the SLM is imaged onto the CCD (i.e. the positions of the SLM, lens, and CCD satisfy the lens equation). The holographic storage material is located between the lens and CCD. Preferably, the storage material is located centered upon a Fourier plane of the lens. In this case, the apparatus also has a phase mask located adjacent to the SLM. Alternatively, the storage material is located a distance away from the Fourier plane or is not centered on the Fourier plane. In yet another embodiment, the holographic storage material is located in contact with the CCD.
摘要翻译： 一种没有读出透镜的全息数据存储装置。 该装置具有空间光调制器（SLM），诸如透镜的聚焦元件，全息数据存储材料和诸如CCD的空间光检测器。 透镜位于SLM和CCD之间，使得SLM成像到CCD上（即，SLM，透镜和CCD的位置满足透镜等式）。 全息存储材料位于透镜和CCD之间。 优选地，存储材料以透镜的傅立叶平面为中心。 在这种情况下，该装置还具有位于SLM附近的相位掩模。 或者，存储材料位于离傅立叶平面一定距离处，或者不在傅立叶平面上居中。 在另一个实施例中，全息存储材料位于与CCD接触。
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3.发明授权Encrypted holographic data storage based on orthogonal phase code multiplexing 失效基于正交相位码复用的加密全息数据存储
公开(公告)号：US5940514A
公开(公告)日：1999-08-17
申请号：US643115
申请日：1996-04-30
CPC分类号： H04K1/00 , G03H1/26 , G03H2001/0022 , G03H2001/2675
摘要： An encryption method and apparatus for holographic data storage are disclosed. In a system using orthogonal phase-code multiplexing, data is encrypted by modulating the reference beam using an encryption key K represented by a unitary operator. In practice, the encryption key K corresponds to a diffuser or other phase-modulating element placed in the reference beam path, or to shuffling the correspondence between the codes of an orthogonal phase function and the corresponding pixels of a phase spatial light modulator. Because of the lack of Bragg selectivity in the vertical direction, the phase functions used for phase-code multiplexing are preferably one dimensional. Such phase functions can be one-dimensional Walsh functions. The encryption method preserves the orthogonality of reference beams, and thus does not lead to a degradation in crosstalk performance.
摘要翻译： 公开了一种用于全息数据存储的加密方法和装置。 在使用正交相位码复用的系统中，通过使用由单一运算符表示的加密密钥K调制参考波束来加密数据。 实际上，加密密钥K对应于放置在参考光束路径中的扩散器或其他相位调制元件，或者改变正交相位函数的代码与相位空间光调制器的相应像素之间的对应关系。 由于在垂直方向上缺乏布拉格选择性，所以用于相位码复用的相位函数优选地是一维的。 这样的相位函数可以是一维沃尔什函数。 加密方法保留参考光束的正交性，因此不会导致串扰性能下降。
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公开(公告)号：US5450218A
公开(公告)日：1995-09-12
申请号：US286480
申请日：1994-08-04
CPC分类号： G03H1/0248 , G11B13/045
摘要： A method for encoding and decoding digital data for storage in a holographic medium (12). Digital data, consisting of binary data (B.sub.i) or grey scale data (A.sub.i), is encoded in bit groups or digit groups (B.sub.k, A.sub.k) containing at least k=1 bits or digits, respectively, by assigning to each bit group (B.sub.k) one reference bit (B.sub.r) and to each digit group (A.sub.k) two reference digits (A.sub.r1, A.sub.r2), assigning the bits of group (B.sub.k) to information bits (B.sub.j), assigning the digits of group (A.sub.k) to information digits (A.sub.j), assigning the reference bit (B.sub.r) and information digits (B.sub.j) to a reference pixel (P.sub.r) and information pixels (P.sub.j) chosen from pixels (24) of a holographic signal modulator (18), and assigning the reference digits (A.sub.r1, A.sub.r2) and information digits (A.sub.j) to reference pixels (P.sub.r1, P.sub.r2) and information pixels (P.sub.j) chosen from pixels (24) of the holographic signal modulator (18). Storing all pixels (24) by illuminating the holographic signal modulator (18) with a signal beam (22) which impresses upon the signal beam (29) pixels (24), guiding the signal beam (22) to the holographic medium (12) and storing the pixels (24) by directing a reference beam (26) at the holographic medium (12) from a predetermined angle .beta. and at a predetermined part of the holographic medium (12). Decoding the encoded binary data (B.sub.i) and encoded grey scale data (A.sub.i) by aiming the reference beam (26) at the holographic medium (12) at the same angle .beta. and location as during storage, recovering pixels (24) and recovering from them using a decoding unit (38) reference bits (B.sub.r) and information bits (B.sub.j) for each bit group (B.sub.k), and recovering reference digits (A.sub.r1, A.sub.r2) and information digits (A.sub.j) for each digit group (A.sub.k). Reconstructing the original binary data (B.sub.i) by differentiating the binary values of bits (B.sub.r) and (B.sub.j). Reconstructing the grey scale data (A.sub.i) by differentiating the reference digits (A.sub.r1, A.sub.r2) to obtain a benchmark (D.sub.r) and applying a binary operation on the benchmark (D.sub.r) and each of the information digits (A.sub.j).
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公开(公告)号：US5877873A
公开(公告)日：1999-03-02
申请号：US685623
申请日：1996-07-24
IPC分类号： G03H1/10 , G11B7/0065 , G11C13/04 , G03H1/28
CPC分类号： G03H1/10 , G11B7/0065 , G11C13/042 , G03H2001/2675 , G03H2210/11 , G03H2210/12 , G03H2210/22 , G03H2260/54
摘要： A video image F�k! is identified as a basis image and stored as a basis page S�k! in a holographic storage medium. A subsequent image F�k+n! is stored by recording in the medium a page S�k+n!=F�k+n!-a�k!F�k!, where a�k!.noteq.0 and preferably a�k!=1. The page S�k! is recorded with a reference beam R�k!, while S�k+n! is recorded with a reference beam R�k+n! orthogonal to R�k!. The basis page is reset whenever the average intensity of a page to be stored exceeds a predetermined threshold. An image F'�k! is retrieved by reading basis page S�k! and letting F'�k!=S�k!. Subsequent images F'�k+n! are retrieved as S�k+n!+b�k!S�k!, where b�k!.noteq.0 and preferably b�k!=a�k!=1. The page addition step is performed coherently, i.e. by accessing the medium with a reference wave function R�k+n!+b�k!R�k!. The coherent addition is achieved by using a compound phase-and-amplitude modulator in a phase-code-multiplexed system, and by simultaneously accessing the storage medium at two different angles in an angle-multiplexed system. Differential video compression leads to a reduction in interpage crosstalk and to a capacity increase in crosstalk-limited memories. Optical page-by-page addition allows fast readout and eliminates the need for a time-consuming electronic decompression step.
摘要翻译： 视频图像F [k]被识别为基础图像并作为基本页S [k]存储在全息存储介质中。 通过在介质中记录S [k + n] = F [k + n] -a [k] F [k]来存储后续图像F [k + n]，其中a [k] a [k] = 1。 以参考光束R [k]记录页S [k]，而用与R [k]正交的参考光束R [k + n]记录S [k + n]。 每当要存储的页面的平均强度超过预定阈值时，基页被重置。 通过读取基本页S [k]并使F'[k] = S [k]来检索图像F'[k]。 随后的图像F'[k + n]被检索为S [k + n] + b [k] S [k]，其中b [k] NOTEQUAL 0并且优选地b [k] = a [k] = 1。 相干地执行页面添加步骤，即通过访问具有参考波函数R [k + n] + b [k] R [k]的介质。 通过在相位码复用系统中使用复合相位和幅度调制器，并且在角度多路复用系统中以两个不同的角度同时访问存储介质来实现相干相加。 差分视频压缩导致分组串扰的减少和串扰限制存储器的容量增加。 光学逐页添加允许快速读出，并且不需要耗时的电子减压步骤。
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6.发明授权Method of choosing an optimum angle between a reference beam and an object beam to record a hologram 失效选择参考光束和物体光束之间的最佳角度以记录全息图的方法
公开(公告)号：US5850299A
公开(公告)日：1998-12-15
申请号：US655903
申请日：1996-05-31
IPC分类号： G03H1/02 , G03H1/04 , G11B7/0065 , G03H1/06 , G03H1/28
CPC分类号： G03H1/0248 , G11B7/0065 , G03H2001/0268 , G03H2001/0473
摘要： A method of choosing an angle between a reference beam and a signal beam in a holographic storage apparatus is presented. The angle between the reference and signal beams can be optimized in light of crosstalk, scattering and wavelength seperation considerations.
摘要翻译： 提出了一种在全息存储装置中选择参考光束和信号光束之间的角度的方法。 根据串扰，散射和波长分离考虑，可以优化参考和信号光束之间的角度。
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公开(公告)号：US6023355A
公开(公告)日：2000-02-08
申请号：US643062
申请日：1996-04-30
CPC分类号： G03H1/26 , G03H2001/2675
摘要： A method for coded-wavelength multiplexing according to which a signal waves S.sub.i (r) is recorded in a holographic medium in a counter-propagating geometry using corresponding writing reference waves R.sub.i (r). The method involves selecting discrete wavelengths .lambda. and encoding reference wave vectors .rho..sub.l which make up writing reference waves R.sub.i (r) such that the writing reference waves R.sub.i (r) at each wavelength .lambda. are orthogonal. The stored signal waves S.sub.i (r) are reconstructed in the form of reconstruction waves A.sub.c (.sigma.) with reconstruction reference waves R.sub.c (r) selected from among the writing reference waves R.sub.i (r). In the event of angular multiplexing of the reference wave vectors .rho..sub.l, it is possible to use one reference wave to produce a number of reconstruction waves A.sub.c (.sigma.) and generate a mosaic of desired holographic pages.
摘要翻译： 一种用于编码波长多路复用的方法，根据该方法，信号波Si（r）以相反的传播几何形状使用相应的写入基准波Ri（r）记录在全息介质中。 该方法包括选择离散波长λ和编码参考波矢量rho，其构成写入参考波Ri（r），使得每个波长λ处的写入基准波Ri（r）是正交的。 存储的信号波Si（r）以从写入基准波Ri（r）中选择的重建基准波Rc（r）的重构波Ac（sigma）的形式被重建。 在参考波矢量rho1的角度多路复用的情况下，可以使用一个参考波来产生多个重建波Ac（sigma）并产生期望的全息页的马赛克。
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8.发明授权
公开(公告)号：US5740184A
公开(公告)日：1998-04-14
申请号：US625561
申请日：1996-04-01
IPC分类号： G11B7/0065 , G11B20/10 , G11C13/04 , H04L25/03
CPC分类号： G11B20/10009 , G11C13/042 , H04L25/03178 , G11B7/0065
摘要： Signal processing methods for addressing intersymbol interference in page-access optical memories such as holographic or two photon systems are disclosed. The invention takes advantage of the cartesian arrangement of data in page-access optical memories. A detector using the Viterbi algorithm is used to decode data row by row. Decision feedback is used in the direction perpendicular to the Viterbi direction. The use of data from previously decoded rows allows a reduction in the complexity of the Viterbi detector.
摘要翻译： 公开了用于寻址页访问光存储器（例如全息或双光子系统）中的符号间干扰的信号处理方法。 本发明利用页访问光存储器中的笛卡尔数据排列。 使用维特比算法的检测器用于逐行解码数据。 在垂直于维特比方向的方向上使用判定反馈。 使用来自先前解码的行的数据允许降低维特比检测器的复杂性。
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9.发明授权Ion and impurity concentration optimization in photorefractive media for dynamic and fixed holography 失效用于动态和固定全息术的光折射介质中的离子和杂质浓度优化
公开(公告)号：US5729364A
公开(公告)日：1998-03-17
申请号：US676010
申请日：1996-07-05
CPC分类号： G03H1/02 , G11B7/0065 , G11B7/241 , G11B7/26 , G11C13/042 , G03H2001/026 , G03H2001/0268
摘要： Ionic and impurity concentrations in a photorefractive holographic storage medium are optimized such that electronic and ionic Debye numbers match an expected grating wave number K, at fixing and recording temperatures, respectively. Simultaneous and sequential recording and fixing are evaluated. The photovoltaic effect is reduced, subject to response time and absorption constraints, by matching reduced and oxidized impurity concentrations.
摘要翻译： 在光折射全息存储介质中的离子和杂质浓度被优化，使得电子和离子德拜号分别在定影和记录温度下与预期的光栅波数K相匹配。 同时进行连续记录和定影。 通过匹配减少和氧化的杂质浓度，光伏效应降低，受到响应时间和吸收约束。
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公开(公告)号：US6040930A
公开(公告)日：2000-03-21
申请号：US71428
申请日：1998-05-01
申请人： John F. Heanue , Andrew J. Daiber , James Colvin
发明人： John F. Heanue , Andrew J. Daiber , James Colvin
CPC分类号： G11C13/044
摘要： The data encoder (e.g. an amplitude spatial light modulator, ASLM) in a volume holographic storage system is rotated by 45.degree. relative to the normal to the plane of the reference and signal beams, such that the near-Fourier transform pattern of the encoder at the medium has an X-shape. The encoder rotation allows tight packing of spatial multiplexing subvolumes in a rectangular array, and provides for uniform spatial frequency filtering in a perpendicular geometry.
摘要翻译： 体积全息存储系统中的数据编码器（例如，幅度空间光调制器，ASLM）相对于参考和信号光束的平面的法线旋转45°，使得编码器的近傅立叶变换图案 该介质具有X形。 编码器旋转允许将空间复用子体积紧密地堆积成矩形阵列，并且在垂直几何中提供均匀的空间频率滤波。
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