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1.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：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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4.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：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：US5844700A
公开(公告)日：1998-12-01
申请号：US685513
申请日：1996-07-24
CPC分类号： G11B7/0025 , G03H1/0248 , G03H1/26 , G11B7/0065 , G03H1/265
摘要： Partially overlapping holograms are stored in a cylindrical volume holographic storage medium capable of rotation about and translation along its longitudinal axis. The reference and signal beams are mutually perpendicular, and each is perpendicular to the longitudinal axis. An index-matched housing encloses the medium laterally. An optional helically-varying optical axis (c-axis) orientation allows recording at constant angular intervals over a full revolution. Signals from stored pages are used to dynamically adjust the positioning of the medium relative to the light beams as the medium continuously spins at high velocity, and to control the access of the signal beam to the readout camera.
摘要翻译： 部分重叠的全息图存储在能够围绕其纵向轴线旋转和平移的圆柱体积全息存储介质中。 参考信号光束和信号光束相互垂直，并且每个垂直于纵向轴线。 索引匹配的外壳横向包围介质。 可选择的螺旋变化光轴（c轴）方向允许以一整圈的恒定角度间隔进行记录。 来自存储页面的信号用于在介质以高速连续旋转时动态地调节介质相对于光束的定位，并且控制信号光束到读出照相机的存取。
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公开(公告)号：US06414763B1
公开(公告)日：2002-07-02
申请号：US09612339
申请日：2000-07-06
IPC分类号： G02B532
CPC分类号： G03H1/268 , G11B7/0065 , G11C13/042
摘要： A digital electronic camera includes a holographic medium, an imaging array disposed at a focal plane for converting optical information to digital information; and an optical system configured to store the digital information onto the holographic medium. An optical system for retrieving images stored in the medium may be provided inside the camera or as a separate appliance.
摘要翻译： 数字电子照相机包括全息介质，设置在焦平面处的用于将光学信息转换为数字信息的成像阵列; 以及被配置为将数字信息存储到全息介质上的光学系统。 用于检索存储在介质中的图像的光学系统可以设置在相机内部或作为单独的设备。
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公开(公告)号：US07327667B2
公开(公告)日：2008-02-05
申请号：US10711527
申请日：2004-09-23
IPC分类号： G11B7/125
CPC分类号： H01S5/18391 , G11B7/122 , G11B7/22 , H01S5/02276 , H01S5/02284 , H01S5/0261 , H01S5/0425 , H01S5/18311 , H01S5/18369 , H01S5/18375 , H01S5/18377 , H01S2301/166
摘要： A single monolithic semiconductor substrate comprises a first side and a second side. The first side includes an air bearing surface. A laser integrates with the first side. The laser has an emission facet substantially co-planer with the air bearing surface. A contact pad on the second side electronically bridges to the laser.
摘要翻译： 单个单片半导体衬底包括第一侧和第二侧。 第一侧包括空气轴承表面。 激光与第一面相结合。 激光器具有与空气轴承表面基本上共同平面的发射面。 第二侧的接触垫电子地连接到激光器。
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公开(公告)号：US06937637B1
公开(公告)日：2005-08-30
申请号：US10441429
申请日：2003-05-19
CPC分类号： H01S5/18391 , G11B7/122 , G11B7/22 , H01S5/02276 , H01S5/02284 , H01S5/0261 , H01S5/0425 , H01S5/18311 , H01S5/18369 , H01S5/18375 , H01S5/18377 , H01S2301/166
摘要： A near-field optical system having one or more solid state lasers and an aerodynamically shaped slider which comprise a single integrated, monolithic device fabricated from the same base semiconductor material. The monolithic optical head can be quickly and easily attached to the read arm of an optical read/write device without requiring attachment of separate laser elements, and without micropositioning or use of optical microscopy for positioning the lasers. The optical head comprising a single semiconductor substrate including a first region which defines a slider having an air bearing surface, and at least one second, laser region which defines a diode laser, with the diode laser having an emission face which is substantially co-planar with the air bearing surface. A slider region of the semiconductor substrate includes an air bearing surface, adjacent the p-clad layer, which is aerodynamically structured and configured to define a slider. The integral lasers include a p-electrical contact and an n-electrical contact which are electrically accessible from one side of the laser, which allows the laser to be used directly with a drive circuit substrate.
摘要翻译： 具有一个或多个固态激光器和空气动力学形状的滑块的近场光学系统，其包括由相同的基底半导体材料制造的单个集成的单片器件。 单片光学头可以快速且容易地附接到光学读/写设备的读取臂，而不需要附加单独的激光元件，并且不需要定位微距定位或使用光学显微镜来定位激光器。 该光学头包括单个半导体衬底，该半导体衬底包括限定具有空气支承表面的滑块的第一区域和限定二极管激光器的至少一个第二激光区域，二极管激光器具有基本共面的发射面 与空气轴承表面。 半导体衬底的滑块区域包括邻近p覆盖层的空气支承表面，其空气动力学构造并构造成限定滑块。 整体激光器包括可从激光器的一侧电接触的p电接触和n电接触，这允许激光器直接与驱动电路基板一起使用。
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