共查询到16条相似文献,搜索用时 62 毫秒
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介绍了一种利用光栅的一级衍射光斑光强测量待测液体折射率的方法,简称光栅光强法。阐明了光栅光强法测量液体折射率的实验原理,组建实验装置,测量了水-丙三醇、蛋白-pH10缓冲液两种混合液体的折射率和光栅衍射光强的关系曲线,测量得到的无水乙醇的折射率与理论值的相对误差小,具有实验装置易于搭建、操作简单的特点,在实验教学研究等领域具有一定的研究和应用价值。 相似文献
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Zhang Xinghui 《物理与工程》1998,(6)
本文介绍一种在普通物理阶段严格计算光栅衍射光强分布的振幅矢量方法,此方法回避了困难的菲涅耳-基尔霍夫积分,这通常在普通物理中是不被采纳的.用振幅矢量法计算有两个显著的优点,一个是物理概念清楚,另一个是计算简单严格 相似文献
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本文介绍了一种在普通物理阶段严格计算光栅衍射光强分布的振幅矢量方法,此方法回避了困难的菲涅耳-基尔霍夫积分,这通常在普通物理中是不被采纳的,用振幅矢量法计算有两个显著的优点,一个是物理概念清楚,另一个是计算简单严格。 相似文献
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给出了依据惠更斯-菲涅耳原理,用实函数积分直接导出光栅衍射在光屏上任一点的合振动的表达式以及光强分布函数的方法. 相似文献
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传统方格型二维光栅与周期性缝隙阵列的组合薄膜结构具有雷达和光学波段双带通的电磁特性. 但由于其杂散光能量集中分布而严重制约它在高精度探测以及成像领域中的应用. 本文提出了一种全新的组合薄膜结构, 即由满足一定约束条件的圆孔型二维光栅和十字缝隙阵列构成. 基于Fraunhofer衍射理论建立组合薄膜结构标量衍射模型, 通过对比两种组合薄膜结构的衍射光分布, 理论分析与实验测试均表明: 圆孔型光栅与十字缝隙阵列组合薄膜结构不仅能够提高其光学透过率, 而且还使其杂散光分布均匀, 降低了其杂散光总比率, 从而有效抑制杂散光, 进一步增强了二维光栅与周期性缝隙阵列组合薄膜结构在实际光学系统中的可靠性.
关键词:
二维光栅
组合薄膜结构
衍射光强
杂散光 相似文献
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Light refraction in a medium results from energy exchange between the medium and the magnetic field of the light. Formulas of refractive index, that is, the ratio of light speed in vacuum to light speed in the medium, were derived with the inductor model of electron cloud and the law of energy conservation. Refractive indices of several media were calculated using the formulas derived, and the calculated results are in agreement with the results measured. The anisotropy and the nonlinearity of the refractive index are explained with the theory described in this work. 相似文献
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Zhang Tao 《中国科学G辑(英文版)》2007,50(5):591-600
The roles of the magnetic field and electric field of the light are investigated when the light is refracted in the medium.
The model of the electron cloud conductor is presented. Electron cloud in a molecule is treated as a conductor and the Faraday’s
Law is applied to this conductor that is in the alternating magnetic field of the light. dB
M/dt of the light gives rise to an alternating induced current on the electron cloud conductor, and the light exchanges energy,
i.e. the refractive energy, with the electron cloud conductor. Formulas of refractive index, which is the ratio of light speed
in vacuum to that in the medium, are derived with this model. These formulas are tested with several mediums and Langevin’s
diamagnetic susceptibility of helium gas, and the results are in good agreement with the measured data. The anisotropy and
the nonlinearity of the refractive index are explained with the theory described in this work.
Supported by Beijing Science and Technology New Star Program (Grant No. 952870400), the Beijing Municipal Commission of Education
and the Excellent Young Teachers Program of Ministry of Education of China 相似文献
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由光的波动方程证明,若介质为旋光物质,则其极化率张量χ一定有非对角对称的共轭虚元素,并导出了旋光晶体的寻常折射率no与左旋光折射率nL和右旋光折射率nR之间的关系.将理论分析结果与实验数据相对照,结果完全吻合. 相似文献
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ZHANG Peng ZHAO Jianlin XU Honglai SUN Yidong YANG Dexing & WANG Meirong . Institute of Optical Information Science Technology School of Science Northwestern Polytechnical University Xi’an China . School of Science Xi’an Jiaotong University Xi’an China 《中国科学G辑(英文版)》2005,48(4):399-412
1 IntroductionSince the discovery of photorefractive effect by Ashkin et al. at the Bell laboratories in 1966[1], such effects of light-induced refractive index changes in electro-optic oxide crystals have attracted great attention because of their potential use in volume holo- graphic storage[2], optical information processing[3], optical spatial solitons[4], and light-induced optical waveguides[5―9]. The photo-induced index changes are the basis ofthe entire photorefractive phenomena in pho… 相似文献