共查询到18条相似文献,搜索用时 109 毫秒
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锥形发散梯度折射率纤维透镜的成像特性 总被引:1,自引:0,他引:1
从光线方程出发,讨论一种圆锥形发散梯度折射率纤维透镜的成像特性.导出在纤维中光线轨迹的解析解,并给出透镜的等效焦距、主平面位置、成像公式及纤维的有效长度计算结果. 相似文献
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本文研究一种指数型发散梯度折射率纤维的光线传输及近轴成像特性。从光线微分方程求得纤维中光线轨迹的解析解,并给出纤维透镜的高斯参(?)及物像计算公式。 相似文献
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抛物型发散梯度折射率纤维透镜的光线传播和近轴成像特性 总被引:1,自引:0,他引:1
本文从光线方程出发,讨论一种抛物型发散梯度折射率纤维透镜的光线传播和近轴成像特性,导出光线在纤维透镜中传播轨迹的解析解,并给出纤维透镜的等效焦距、主平面和焦平面位置的计算公式,以及近轴成像公式。 相似文献
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根据抛物型梯度折射率纤维透镜的近轴成像公式,分析了具有一定缩放倍率的梯度折射率纤维端面耦合成像的特性,探讨了这种纤维端面耦合成像元件的设计。 相似文献
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本文从光线方程和近轴波动方程出发,研究了光在逆抛物型梯度折射率纤维中的传播规律。详细分析了纤维特性参数(g_0、L)及入射光束参数(ω_0)对光传播特性的影响,得出了对开拓梯度折射率纤维透镜在激光光电子装置中应用的有益的结论。 相似文献
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本文从光线轨迹方程出发,分析了光在锥形梯度折射率纤维中传播的变周期特性,导出锥形纤维中光线传播周期的解析表达式,给出若干锥形纤维的周期计算结果,四分之一周期长度及其相应的焦距值。 相似文献
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本文从光线轨迹方程出发,讨论锥形发散梯度折射率纤维透镜成象的光学特性;导出大端,小端对目标成象的最大孔径和视场的表达式,以及大端孔径视场与小端孔径视场之间的相互关系。 相似文献
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一、引言为了扩大通信容量,光纤设计者希望制造出具有最佳折射率分布的光纤。判断光纤的折射率分布是否最佳,必须从测得的折射率分布曲线计算出分布指数α的数值。α值对多模光纤传输带宽有着决定性的影响,同时光纤最大理论数值孔径与稳态有效数值孔径之间的比例系数K_α值仅取决于α,考虑到斜射光线时,斜射光线的数值孔径与子午光线数值孔径间的关系也与α有关。无论用反射法、近场法、干涉法还是别的什么方法测出的折射率分布,或是扫描 相似文献
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Diffraction fields in the focal space of some lens is investigated by using ray tracing and Stratton-Chu formulas. Two formulas are used. One is surface integration formula, and for another a line integration is added. Comparison of two calculation results is given. It is shown that for hyperbolic lens two calculations results are same and for extended hemi-ellipsoidal lens there are a lilt difference between them. 相似文献
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黄振永 《激光与光电子学进展》2012,(9):142-148
研究了左手材料棱镜的色散特性和左手材料平行平板的等倾干涉特性。对于左手材料棱镜而言,其色散时出射光偏离原来的传播方向与右手材料棱镜的色散规律恰好相反,且对于同一种单色光而言,当入射角相同时,左手材料棱镜的色散偏向角大于右手材料棱镜的色散偏向角。在研究左手材料平行平板的等倾干涉特性时,推导了反射光和透射光焦平面上的光强分布公式,分析了等倾干涉条纹的级数与亮、暗条纹的关系,讨论了光程差的影响因素及影响规律,推导了存在半波损失情况下的等倾圆环的亮环半径公式和暗环宽度公式。研究发现:对于左手材料平行平板的等倾干涉条纹而言,等倾干涉圆环中心处的干涉级数较小;偏离圆环中心越远,干涉条纹的级数越大。这一规律和右手材料平行平板的等倾干涉条纹规律不同。 相似文献
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《Electron Devices, IEEE Transactions on》1966,13(7):544-550
In cathode lenses with high anode potential, as used in image tubes, each object point is imaged by a narrow ray bundle, Requirements for a ray-tracing method are 1) computation of a principal ray with allowance for total aberration, and 2) computation of other rays in the imaging bundle in a manner which is "paraxial" with respect to the principal ray; i.e., small departures from the principal ray, due to initial energies, are computed directly on a linear basis, using potential derivatives at the principal ray only. The method described fulfills these requirements and allows accurate determination of focal surfaces, displaying the effects of field curvature, astigmatism, and distortion. Accuracy is demonstrated by comparison with theoretical results and further supported by practical results. 相似文献
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Gee Walter Lee Shung-Wu Bong Nelson K. Cain Charles A. Mittra Raj Magin Richard L. 《IEEE transactions on bio-medical engineering》1984,(1):38-46
The design and analysis of a focused linear array at 2450 MHz for microwave hyperthermia research is described. The array, which was submerged in deionized water to reduce its size and to provide a better impedance match to a high dielectric medium representative of human tissues, consisted of four titanium dioxide loaded horn antennas with apertures of 2.0 x 1.4 cm and a feed network with weighted phase shifts, Power radiation pattern measurements were made in planes ranging from 7.6 to 10.2 cm from the array to determine the focusing characteristics and beam spot size. Due to high attenuation in the medium, planes beyond 10.2 cm were not considered. The half-power beamwidth (HPBW) measured at the focal point was approximately 1.3 cm. The measured patterns were found to be in close agreement with theoretical predictions. 相似文献