共查询到17条相似文献,搜索用时 46 毫秒
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本文根据光线在球面上的折射公式及光线微分方程,研究了光线经两端面为球面的锥形梯度折射率透镜的传播和变换,基于光线传递ABCD矩阵,提出了球面端面的锥形梯度折射率透镜的一种等效光学系统.文中给出了该透镜的主平面、焦平面和焦距计算公式,以及近轴成像高斯公式.当锥度为零时即得到球面端面的柱形或径向梯度折射率透镜的相应结果. 相似文献
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用变分法以及 ABCD 定律,导出高斯光束经过抛物形发散梯度折射率棒透镜的变换公式。 相似文献
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本文针对梯度折射率分布的透镜(以后简称梯析透镜)与光纤在折射率分布上的不同点,对用于光纤及其预制棒测量的聚焦法的原理公式,计算测量方法等进行了重要改进,从而使聚焦法可适用于梯折透镜的测量.本文通过计算机模拟计算,对原理公式及计算方法的准确性和可靠性进行了验证,并同时给出了这一测量方法的精度,最后给出了测量实例及其比较结果. 相似文献
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关节镜是一种用于观察关节内部结构、诊治关节疾患的内窥镜。利用梯度折射率透镜质量轻、体积小、像质好的优点,运用Zemax软件设计了一款结构简单的关节镜光学系统,可用于1/10"CCD关节内窥镜成像。系统具有60视场角,F数为6, 工作距离从~5 mm,各视场的调制传递函数(MTF)在125 lp/mm时达到0.2以上,分辨率达到4 m,且各组态点列图均小于艾里斑半径。光学结构总长204 mm,最大镜头口径小于4.6 mm,根据关节镜的使用特点,系统满足使用要求。 相似文献
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把梯度折射率激光准直系统视为一个整体,采用矩阵光学的方法,研究了高斯光束经锥形梯度折射率激光准直系统的传输特性.讨论了多级密接锥形梯度折射率激光准直系统的设计原理. 相似文献
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本文研究了一种类锥形梯度折射率纤维的光线传播特性和近轴成象规律。光在这种类锥形纤维中的传播具有变幅值和变周期的振荡特征,文中从光线轨迹的近似解析式出发,导出高斯光学公式,并讨论了结果的适用性。研究表明,类锥形梯度折射率纤维与在光学特性上锥形梯度折射率纤维十分类似,它们都可望成为微型光学和激光装置的重要新元件。 相似文献
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V.P. Nayyar 《Optical and Quantum Electronics》2002,34(7):697-705
Using statistical approach the author has solved the equations for the mutual coherence function of partially coherent Gaussian laser beams in graded-index fibres. The expressions for the complex degree of coherence and the intensity distribution have also been shown that the self-focusing length inside the fibre depends upon the degree of coherence. The result have been discussed for both conical and cylindrical guides. 相似文献
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Propagation and polarization properties of hollow Gaussian beams in uniaxial crystals 总被引:1,自引:0,他引:1
Based on the paraxial vectorial theory of beams propagating in uniaxially anisotropic media, we have derived the analytical propagation equations of hollow Gaussian beams (HGBs) in uniaxial crystals, and given the typical numerical example to illustrate our analytical results. Due to the anisotropy crystals, the ordinary and extraordinary beams originated by incident HGBs propagate with different diffraction lengths, thus the linear polarization state and axial symmetry of incident HGBs do not remain during propagating in crystals. 相似文献
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A sequential electromechanical system capable of delivering the radiation coming from a medium power Nd:YAG laser to an array of multimode optical fibres is presented. The system utilizes GRIN-rod microlenses as focusing-collimating optics. A focusing unit positioned at the fibre distal-end, which can work in two different configurations, has also been designed and constructed. 相似文献
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高斯光束经过负球差透镜的聚焦 总被引:2,自引:0,他引:2
本文讨论高斯光束经过负球差透镜的聚焦,得到了聚焦光场轴上点的光强分布的表示式,并对其进行数值计算。数值计算结果表明,在负球差的情况下,得到光强的最大点位置(最佳聚焦点)相对于无球差情况,往透镜方向移动,并且,最佳聚焦点的光强较无球差时大,当Nw=1,Na=5,kS1=-0.2时,得到的最佳聚焦点的光强是无球差时的1.34倍。本文还讨论了透镜的菲涅尔数对聚焦光场分布的影响。结果表明,当透镜的菲涅尔数小于1时,球差对高斯光束的聚焦的影响可以忽略。 相似文献
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Lie algebraic methods are used in the analysis of the nonlinear transport of charged particle beams in solenoid lenses. Space charge effects are included. The particle distribution we used is a K-V type. Similar procedures can also be used for magnetic dipoles, quadrupoles, sextupoles and other optic elements. 相似文献
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Yuan Dong Guo-Bin Ning Guang-Yong Jin Wei Liang Yan-Fei Lü Chao Wang Kai Zhang 《Optik》2010,121(6):559-562
In this paper, we present a new hollow beams - hollow conical double half-Gaussian beams - and deduce the analytical equation of propagation and transformation of these through the paraxial optical system by using the Collins formula. By using the formula deduced, we calculate and analyze the propagation properties of these in free space. In an experiment, we have obtained hollow conical double half-Gaussian beams, which are cone-angle controllable by using the combinational optical system of the spherical reflector, reflecting positive-axis cone and zoom lens, and we obtain the beam loop of far field in different distances. The results show good coherence between theory and experiment. This paper will play a guiding role in the practical application of hollow conical double half-Gaussian beams. 相似文献
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DONG Yuan ZHANG XiHe JIN GuangYong LING Ming & NING GuoBin School of Science Changchun University of Science Technology Changchun China 《中国科学:物理学 力学 天文学(英文版)》2010,(3)
The far-field propagation properties of conical double half-Gaussian hollow beams in the condition of Collins formula are studied. Because of the cone angle of this kind of hollow beams, the diffraction is compensated and the inner diameter is turning bigger by the rule of geometric optics as the propagation distance is increasing, whereas the degenerating diffraction phenomenon is turned out. The far-field intensity distribution of the conical double half-Gaussian hollow beams in the condition of in-Collin... 相似文献