共查询到19条相似文献,搜索用时 156 毫秒
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光在均匀介质中是沿直线传播的,如果光介质的密度发生改变时,光路将随着发生改变.光线从光密介质射向光疏介质时,随着入射角的不断增大,折射角也不断地增大,并且折射光线的强度在减弱,反射光线的强度在增强如果介质的折射率为n. 相似文献
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在光沿直线传播的假设下,研究了X光激光在等离子体中的传播与放大。对类氢炭等离子体,除非光线不断通过强吸收区,增益曲线的吸收部分不会严重影响X光激光的输出能量。 相似文献
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一、前言一般透镜,采用折射率为常数的均匀媒质,光线在媒质中是直线传播,因不同介质间的球形界使光线折射而产生透镜作用。近年来非均匀媒质透镜引起了人们的重视。特别是折射率沿径向变小的自聚焦透镜, 相似文献
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基于Zemax软件下的非序列模式(non-sequential mode)光线追迹法,分别模拟复合结构板条介质抽运端面和掺杂介质区工作端面上的光强度分布。由追迹结果可知,经过整形,在抽运面强度分布均匀的抽运光束经过非掺杂介质区传播到掺杂介质工作端面后光束分布均匀性大大降低。研究表明复合结构板条介质中非掺杂介质区影响了抽运光束,即抽运光在非掺杂介质区传播过程中发生全内反射,导致部分光束在实际工作端面的部分区域发生叠加,从而致使实际工作端面抽运光束分布不均匀。最后,依据平面波导匀化理论,从改变非掺杂介质区长度和入射光束发散角大小角度出发,提出改善抽运光束均匀性的思路,并进行了模拟验证。 相似文献
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啁啾光脉冲在类时间透镜介质中的传播 总被引:2,自引:0,他引:2
利用空间-时间类似和光线光学方法得到啁啾高斯光脉冲在类时间透镜介质中传播的解析解,讨论了光脉冲宽度和啁啾参数随传播距离的演变,并与光脉冲在克尔介质中传播的特征作了比较。 相似文献
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一、引言普物实验中,对波的传播规律的研究,都是用驻波法在均匀介质中实现的。例如弦振动实验和测定空气中声速的实验。在演示实验中,还有纵波在圆柱形弹簧中传播的实验。但都未涉及非均匀介质的情况。笔者也用驻波法,对锥形弹簧中纵波的传播规律作了实验探讨,得到了传播速度的经验公式。作为研究非均匀介质中波的传播规律的实验,它可以安排到课堂演示和普物实验教学课程中去。 相似文献
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从对称性的角度,分析了光波在无限大均匀介质中、两种媒质的分界面上传播必须遵从的时间和空间平移不变性,推导出光的直线传播、反射以及折射定律,揭示了支配几何光学三定律的更为深刻而底层的对称性原因,这种视角对于光学部分的教学将产生深刻的影响. 相似文献
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The strong similarities between the light propagation in a curved spacetime and that in a medium with graded refractive index are found. It is pointed out that a curved spacetime is equivalent to an inhomogeneous vacuum for light propagation. The corresponding graded refractive index of the vacuum in a static spherically symmetrical gravitational field is derived. This result provides a simple and convenient way to analyse the gravitational lensing in astrophysics. 相似文献
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An asymptotic theory has been developed to describe the propagation and annihilation of vortex pairs in a smoothly inhomogeneous Bose-Einstein condensate with the repulsive interaction between atoms. It has been shown that the trajectories of vortex pairs coincide with geometric-optical rays in an equivalent isotropic medium with the refractive index depending both on the density of the unperturbed inhomogeneous condensate and on the energy of structures under study. The transformation of vortex pairs to vortex-free quasisolitons and back has been described. 相似文献
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Modelling of wave propagation for modern high-frequency radio links must take into account the fluctuation phenomena caused by random changes of the medium's parameters. There are two factors that cause signals from transmitter to receiver to arrive via multiple random paths. The first is a result of scattering by boundaries and various obstacles, while the second is related to random changes in the refractive index of the medium. Similar phenomena are observed in underwater acoustic propagation. In this work the influence of both factors is demonstrated in a simple example when the propagation takes place above a perfectly reflecting surface in the presence of a randomly fluctuating medium. 相似文献
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G. V. Belokopytov 《Radiophysics and Quantum Electronics》1978,21(12):1262-1269
The problem of propagation of electromagnetic waves in an inhomogeneous uniaxial anisotropic medium is discussed. Analytic solutions of Maxwell's equations are found for two particular cases of a plane-layered dielectric. The effect of different parameters of an inhomogeneous distribution of refractive indices on the propagation characteristics of wave beams is analyzed. The corrections of the first approximation of perturbation theory to the propagation constants of natural waves are obtained for a plane-layered focusing medium of general type. This has permitted solving the problem of a distribution of the refractive index which provides for optimal focusing.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 21, No. 12, pp. 1812–1821, December, 1978.In conclusion, the author expresses his gratitude to I. V. Ivanov and N. A. Morozov for their attention to this paper. 相似文献
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Wang Shaomin 《Optical and Quantum Electronics》1985,17(1):1-14
A set of matrix methods treating decentred optical systems in the paraxial approximation is reviewed. Misalignment phenomena of optical systems can generally be described by an augmented 4×4 matrix; propagation of optical rays in an asymmetric, inhomogeneous medium by a 3×3 matrix. In order to simplify the operations with these matrices, ray transfer flow graphs are introduced.A lot of optical problems can be solved in a clear and simple manner, including optical arrays. Some examples are given. 相似文献
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