搜索结果: 76-90 共查到“知识库 物理光学”相关记录477条 . 查询时间(4.964 秒)
偏振和衍射双重效应影响的Schmidt棱镜特性
Schmidt棱镜 屋脊衍射 偏振效应 偏振像差
2012/12/13
一束偏振光经过Schmidt棱镜的两个不同路径,成为两个不同的偏振状态,使得出射光束的偏振态呈现非均匀分布.为了探索偏振态非均匀分布对Schmidt棱镜传光质量的影响机理,将两个路径对应的光波函数引入屋脊衍射积分方程,得到了偏振效应影响的屋脊衍射场强分布.场强分布的数字计算表明:在偏振效应和衍射效应的双重影响下,经Schmidt棱镜出射的光场分布出现了严重变形;对应同一入射线偏振光出现的P、S两分...
4Pi focusing of spatial ly modula ted radially polarized vorte x beams
4 Pifocusing spatially modulated radially polarized vortex beams
2013/7/3
We propose a method for generating focal beams with special intensity distributions using radially polarized vortex beams in a 4Pi configuration. A spherical dark-hollow beam and hollow beam array can...
Propagation properties of stochastic electromagnetic double-vortex beams in turbulent atmosphere
double-vortex beams coherent polarization turbulent atmosphere
2013/7/3
Based on the extended Huygens–Fresnel principle, we study the propagation properties of stochastic electro-magnetic double-vortex beams in turbulent atmosphere. The result shows that the spreading of ...
Tight focusing properties of hybridly polarize d vector beams
Tight focusing properties hybridly polarize dvector beams
2013/7/3
We theoretically investigate the tight focusing properties of hybridly polarized vector beams. Some numerical results are obtained to illustrate the intensity, phase, and polarization of tightly focus...
经光阑衍射的平顶涡旋光束位相奇点的演化特性
奇点光学 平顶涡旋光束 光阑衍射 刃型位错
2012/12/13
推导出了平顶涡旋光束通过有光阑ABCD光学系统的传输解析式,并以光阑透镜和矩形光阑系统为例,与平顶光束比较研究了截断参量、相对离轴距离和光束阶数对衍射场中位相奇点演化特性的影响.数值计算表明,平顶涡旋光束通过上述光学系统均存在位相奇点,即使源处涡旋被光阑阻拦时,衍射场中也会出现位相奇点;而平顶光束通过光阑透镜系统存在刃型位错,随着截断参量增大,会发生刃型位错的演化和湮灭现象,且平顶光束通过矩形光阑...
Optical Torque Exerted on a Rotator under Illumination of a Vortex Beam
Optical Torque Exerted Rotator Illumination Vortex Beam
2013/7/3
We investigate the torque on a specially shaped rotator produced by a vortex beam. The formulas for the torque alongx, yandzdirections are derived, and numerically calculation is performed. It is foun...
Analyses and Improvements of Whiteness of Reflective Liquid
whiteness reflective LCDs reflector non dispersion LC cell gap random grating light control film
2011/11/25
A reflective liquid crystal display (R-LCD) has become an important component of a portable information device; however, its inadequate whiteness appearance is a major issue in achieving the potential...
Abstract—This work presents a novel wavelength conversion scheme, differential cross-polarization modulation (DXPoM), using an extra birefringence delay to enhance the performance of the conventional ...
A periodic add/drop system in a fiber ring network was investigated using a reconfigurable optical add/drop multiplexer (ROADM) in a re-circulating fiber loop. After seven cascaded add/drop nodes at e...
A Novel Direct Detection Microwave Photonic Vector Modulation Scheme for Radio-Over-Fiber System
2011/11/22
This letter demonstrates the feasibility of a novel direct detection microwave photonic vector modulation scheme for the radio-over-fiber (RoF) system. Unlike the traditional double-sideband with opti...
Propagation of partially coherent double-vortex beams in turbulent atmosphere
Partially coherent Double-vortex beams Turbulent atmosphere
2013/7/3
Based on the extended Huygens–Fresnel principle, we study the propagation properties of partially coherent double-vortex beams in turbulent atmosphere. The intensity distribution of the beams on propa...
基于三片曲面反射镜的离轴投影成像系统
离轴投影成像系统 泽尼克多项式曲面 调制传递函数 畸变
2012/12/12
采用调制传递函数和波前像差分析方法,设计了基于偶次非球面反射镜和Zernike自由曲面反射镜构成的放大倍数为80,相对孔径为2.8的三个离轴投影成像系统.其中第一片反射镜M1表面为凹面用于减小第二片反射镜的尺寸及获得高的对比度,而第二片反射镜M2和第三片反射镜M3表面为凸面用于校正系统像差及获得更短的投影距离.经软件设计与分析,三系统中基于三片Zernike自由曲面反射镜的成像系统光学性能最好,调...
根据里查德沃耳夫矢量积分理论，研究了在径向偏振光经大数值孔径聚焦下，透镜球差对瑞利粒子轴向光阱力的影响。通过数值计算得到了轴向光阱力随球差系数变化的分布。研究结果表明，球差系数的存在，不仅改变了光阱力的数值大小，也影响了对粒子束缚的有效作用区域，还导致光阱中心位置发生偏移。而且正负球差系数对光阱力的影响并不总是对称的，正球差系数使得梯度力的０点位置往狕轴正向偏移，负球差系数使得梯度力的０点位置往狕...
Efficiently Testing Sparse GF(2) Polynomials
Property testing GF(2) polynomials Sparse polynomials Randomized algorithms
2012/12/3
We give the first algorithm that is both query-efficient and time-efficient for testing whether an unknown function f : {0, 1}n → {−1, 1} is an s-sparse
GF(2) polynomial versus -far from every...