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公开(公告)号：US5430748A
公开(公告)日：1995-07-04
申请号：US184676
申请日：1994-01-21
CPC分类号： H01S3/10076 , H01S5/4025 , H01S5/145 , H01S5/2036 , H01S5/4006 , H01S5/4062
摘要： A laser system includes a linear array of broad area lasers. Such a laser source produces a beam that has a polarization axis in the direction in which the array extends and a coherency axis orthogonal to that. The laser is injection locked by phase conjugating a portion of the array's light output. The phase conjugator has a conjugation axis. The coherency axis is aligned with this conjugation axis. External cavity optics include a polarization rotator to align the polarization axis with the coherency axis before the beam reaches the phase conjugator. Thus, the polarization, coherency, and conjugation axes are all aligned, optimizing the action of the phase conjugator. The approach works in both a single-beam and a dual-beam phase conjugation mode. The result is a laser system output of higher intensity, greater coherence, and a narrower frequency range.
摘要翻译： 激光系统包括广域激光器的线性阵列。 这样的激光源产生在阵列延伸的方向上具有偏振轴的光束和与之相垂直的相干轴。 激光器通过相位共轭阵列的光输出的一部分被注入锁定。 相位共轭器具有共轭轴。 相干轴与该共轭轴对齐。 外腔光学器件包括偏振旋转器，以在光束到达相位共轭器之前将偏振轴与相干轴对准。 因此，极化，相干性和共轭轴都对齐，优化了相位共轭器的作用。 该方法在单光束和双光束相位共轭模式中均有效。 结果是激光系统的输出强度更高，相干性更强，频率范围更窄。
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2.发明授权Near-ultra-violet formation of refractive-index grating using reflective phase mask 失效使用反射相位掩模的近紫外形成折射光栅
公开(公告)号：US5745617A
公开(公告)日：1998-04-28
申请号：US775461
申请日：1996-12-30
CPC分类号： G02B6/02138 , G02B2006/02161 , G02B6/02185
摘要： A grating is induced in the core of a hydrogen-loaded high-germanium-content optical fiber using near-UV (275 nm-390 nm) laser light. An interference pattern is generated at the core using a molded polymer phase mask with a square wave surface relief pattern. The light is directed through the phase mask, through a protective fiber coating, through the cladding, and into the core. The phase mask generates an interference pattern with a period half that of the surface relief pattern. Index of refraction changes occur at the bright fringes of the interference pattern--thus creating the grating. Advantages over existing mid-UV technology include lower fabrication costs for phase masks, simplified grating induction since fiber coatings do not need to be removed, and reduced infrared absorption caused by grating formation in the fiber.
摘要翻译： 在使用近紫外（275nm-390nm）激光的氢负载高锗含量光纤的芯中感应出光栅。 使用具有方波表面浮雕图案的模制聚合物相位掩模在芯处产生干涉图案。 光穿过相位掩模，穿过保护性纤维涂层，穿过包层并进入芯体。 相位掩模产生具有表面浮雕图案的周期的一半的干涉图案。 折射率变化发生在干涉图案的明亮条纹上，从而产生光栅。 现有的中紫外线技术的优点包括降低相位掩模的制造成本，简化光栅感应，因为不需要去除光纤涂层，并减少光纤中形成光栅造成的红外吸收。
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公开(公告)号：US5005927A
公开(公告)日：1991-04-09
申请号：US329731
申请日：1989-03-28
IPC分类号： G03H1/00
CPC分类号： G03H1/00
摘要： A microscope that preferentially displays either moving or stationary objects. This all-optical device operates in real-time using the coupling of optical beams in suitable nonlinear medium such as a photorefractive crystal of barium titanate. A holographic image is continuously written and compared with the real image. For the transient detection microscope any discrepancy between the two images is immediately visible. In the stationary object enhancing microscope stationary objects are enhanced and preferentially displayed.
摘要翻译： 优先显示移动或静止物体的显微镜。 该全光学器件使用合适的非线性介质（例如钛酸钡的光折射晶体）中的光束耦合来实时操作。 全息图像被连续写入并与真实图像进行比较。 对于瞬态检测显微镜，两个图像之间的任何差异将立即可见。 在静止物体增强显微镜中，固定物体被增强并优先显示。
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公开(公告)号：US4953954A
公开(公告)日：1990-09-04
申请号：US308580
申请日：1989-02-10
CPC分类号： H04J15/00 , G02F1/3538 , H04J14/02
摘要： A phase-conjugate optical communication system includes a first source of coherent radiation for producing a first beam having a nominal wavelength .lambda. and a first modulator for temporally modulating the first beam. A second source of coherent radiation, mutually incoherent with the first source, produces a second beam having the nominal wavelength .lambda., while a second modulator temporally modulates the second beam. A mutually pumped phase conjugator is positioned such that the first and second beams fan in the conjugator and produce a set of shared fanning holograms, the holograms causing a third beam, which is the phase conjugate of the first beam and on which is imposed the temporal modulation of the second beam, to be diffracted in a direction opposite to the first beam and causing a fourth beam, which is the phase conjugate of the second beam and on which is imposed the temporal modulation of the first beam, to be diffracted in a direction opposite to the second beam.
摘要翻译： 相位共轭光通信系统包括第一相干辐射源，用于产生具有标称波长λ的第一波束和用于暂时调制第一波束的第一调制器。 与第一源相互不相干的第二相干辐射源产生具有标称波长λ的第二光束，而第二调制器对第二光束进行时间调制。 相互泵浦相位共轭器被定位成使得第一和第二光束在共轭器中扇动并产生一组共享的扇形全息图，全息图引起第三光束，第三光束是第一光束的相位共轭，并且在其上施加时间 第二光束的调制将沿与第一光束相反的方向衍射，并且产生作为第二光束的相位共轭的第四光束，并且其上施加第一光束的时间调制，以在 方向与第二光束相反。
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公开(公告)号：US5313315A
公开(公告)日：1994-05-17
申请号：US880170
申请日：1992-05-06
申请人： Jack L. Feinberg , Alexander Rebane
发明人： Jack L. Feinberg , Alexander Rebane
CPC分类号： G03H1/14 , G01N21/4795 , G03H1/0005 , G01N2021/1791 , G03H2001/0083 , G03H2001/0204 , G03H2001/0264 , G03H2001/0467 , G03H2222/33 , G03H2223/26
摘要： In a conventional hologram, a photographic film records the interference pattern of monochromatic light, scattered from an object (20) to be imaged, with a reference beam of unscattered light. Illumination of the developed film with a replica of the reference beam then creates a virtual image of the original object. Molecular resonance may be used to record an interference pattern between light signals that arrive at different times, and with this technique create a hologram (10') with time resolution. Using a time reference pulse (16) as a "light shutter", holographic images may be recorded selectively, according to the time taken by light travelling from the object to the hologram. This method may be used to image an object obscured by a light-scattering medium.
摘要翻译： 在常规全息图中，摄影胶片用未散射光的参考光束记录从待成像的物体（20）散射的单色光的干涉图案。 利用参考光束的复制品照亮所开发的胶片，然后创建原始对象的虚拟图像。 可以使用分子共振来记录在不同时间到达的光信号之间的干涉图案，并且利用该技术产生具有时间分辨率的全息图（10'）。 使用时间参考脉冲（16）作为“光快门”，可以根据从物体向全息图行进的光所花费的时间选择性地记录全息图像。 该方法可以用于对由光散射介质遮蔽的物体进行成像。
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6.发明授权Optical amplification system with non-orthogonal signal and distributed multi-pump beams and photorefractive cleanup 失效具有非正交信号和分布式多泵浦光束的光学放大系统和光折射清理
公开(公告)号：US5729375A
公开(公告)日：1998-03-17
申请号：US609200
申请日：1996-03-01
IPC分类号： H01S3/0941 , H01S3/16 , H01S3/08 , G02B5/23 , G02F1/01
CPC分类号： H01S3/0941 , H01S3/16 , H01S3/1675
摘要： An optical amplification system directs a diffraction-limited signal beam through a series of crossings, at substantially less than 90.degree. crossing angles, with a number of non-diffraction-limited pump beams in a photorefractive medium. The pump beams are e-polarized while the signal beam travels down the crystal medium's c-axis and is polarized in the same plane as the pump beam polarization, resulting in an energy transfer from the pumps to the signal beam while leaving the signal beam diffraction-limited. The photorefractive medium is preferably a series of BaTiO.sub.3 :Rh crystals that are aligned parallel to the angled edge of a wedged-shape prism through which the pump beams are transmitted, with the crystals cut so that their C-axes are parallel to the signal beam.
摘要翻译： 光学放大系统通过与光折射介质中的许多非衍射受限的泵浦光束基本上小于90°交叉角的一系列交叉引导衍射受限的信号光束。 泵浦光束被e偏振，同时信号光束沿着晶体介质的c轴向下移动并且在与泵浦光束偏振相同的平面中被极化，导致从泵到信号光束的能量传递，同时留下信号束衍射 -有限。 光折射介质优选是一系列BaTiO 3：Rh晶体，其平行于楔形棱镜的倾斜边缘排列，泵浦光束通过该倾斜边缘被透射，晶体被切割成使得它们的C轴平行于信号束 。
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7.发明授权Hybrid laser power combining and beam cleanup system using nonlinear and adaptive optical wavefront compensation 失效混合激光功率组合和束清理系统采用非线性和自适应光波前补偿
公开(公告)号：US5717516A
公开(公告)日：1998-02-10
申请号：US825835
申请日：1997-04-04
申请人： Marvin B. Klein , David M. Pepper , Ronald R. Stephens , Thomas R. O'Meara , David Welch , Robert J. Lang , Jack L. Feinberg , Stuart MacCormack
发明人： Marvin B. Klein , David M. Pepper , Ronald R. Stephens , Thomas R. O'Meara , David Welch , Robert J. Lang , Jack L. Feinberg , Stuart MacCormack
CPC分类号： G02F1/397
摘要： An optical amplification system directs a diffraction-limited signal beam through a series of approximately 90.degree. crossings with a number of non-diffraction-limited pump beams in a photorefractive medium. All of the beams are s-polarized, resulting in an energy transfer from the pumps to the signal beam while leaving the signal beam diffraction-limited. The photorefractive medium is preferably a series of BaTiO.sub.3 :Rh crystals that receive the pump and signal beams through orthogonal faces, with their C-axes at approximately 45.degree. to both beams. A binary tree optical distribution network is used to minimize waveguide splits in forming a large number of pump beams. The outputs of several amplification modules are combined into a single output beam using adaptive optics, with the outputs from the different modules phase matched to each other by diverting two minor portions of the combined beam, partially overlapping the diverted beams and adjusting the amplification module phases to cancel phase differentials between the overlapped portions. Similarly, sets of combined and phase-matched beams can be combined with each other (again using adaptive optics) to generate still higher powers using a super module approach.
摘要翻译： 光学放大系统通过在光折射介质中的许多非衍射受限的泵浦光束将衍射受限的信号光束引导通过一系列大约90°的交叉。 所有的光束都是s偏振的，从而导致从泵到信号光束的能量传递，同时保持信号光束衍射受限。 光折射介质优选是一系列BaTiO 3：Rh晶体，其通过正交面接收泵浦和信号光束，其C轴与两个波束大约45°。 二叉树光分配网络用于最小化形成大量泵浦波束的波导分裂。 使用自适应光学器件将多个放大模块的输出组合成单个输出光束，来自不同模块的输出通过转移组合光束的两个次要部分相互匹配，部分地与转向光束重叠并且调整放大模块相位 以消除重叠部分之间的相位差。 类似地，组合和相位匹配波束的组可以彼此组合（再次使用自适应光学器件）以使用超级模块方法来产生更高的功率。
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公开(公告)号：US4773719A
公开(公告)日：1988-09-27
申请号：US79800
申请日：1987-07-30
申请人： Dana Z. Anderson , Jack L. Feinberg
发明人： Dana Z. Anderson , Jack L. Feinberg
CPC分类号： G06K9/745 , G02F1/0541 , G03H1/00 , G08B13/19602
摘要： Changes in an image are detectable by a tracking novelty filter while an incorporated holographic medium is in disequilibrium. A suitably doped single-domain barium titanate crystal can serve as the holographic medium. Image information is imposed on a laser beam in the form of a spatially varying polarization across the beam cross section spatial position. The modulated beam is directed to the crystal, which cooperates with a polarizing beam splitter and a half wave plate to define a polarization conjugator. The conjugated beam is passed through the modulator a second time and then operated on by a beam splitter. When the crystal is in equilibrium with the incident laser light, the beam splitter directs minimal light to a detector. However, when an image change causes a change in the applied modulation, the changed image elements are intensified at the detector while the holographic medium is in disequilibrium. In alternative embodiments, phase is the variable modulated. The holographic medium can be arranged as a conjugator or a two-wave or four-wave mixer.
摘要翻译： 通过跟踪新颖滤镜可以检测到图像的变化，同时引入的全息介质处于不平衡状态。 适当掺杂的单畴钛酸钡晶体可以用作全息介质。 图像信息以横跨横截面空间位置的空间变化偏振的形式施加在激光束上。 调制光束被引导到晶体，其与偏振分束器和半波片协作以限定偏振共轭器。 共轭光束第二次通过调制器，然后由分束器操作。 当晶体与入射激光平衡时，分束器将最小的光引导到检测器。 然而，当图像变化引起所施加的调制的变化时，在全息介质处于不平衡状态时，改变的图像元素在检测器处被增强。 在替代实施例中，相位是变量调制的。 全息介质可以被布置为共轭器或双波或四波混频器。
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