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利用矢量瑞利-索末菲衍射积分公式,推导出了非傍轴部分空间相干部分光谱相干双曲余弦-高斯(ChG)脉冲电磁光束在自由空间传输时交叉谱密度矩阵的远场解析公式,并用来表示脉冲电磁光束的光谱密度(光强)和偏振度。结果表明,对非傍轴远场部分空间相干部分光谱相干ChG脉冲电磁光束,其非傍轴性主要由参数f, f决定,而离心参数、脉冲宽度和时间相干长度影响其非傍轴行为。非傍轴部分空间相干部分光谱相干高斯-谢尔模型脉冲电磁光束的远场传输可作为特例处理。 相似文献
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运用非傍轴光束传输的矢量矩理论,对非傍轴矢量高斯光束的传输特性进行了系统的研究.结果表明,基于二阶矩定义的横向光束宽度在光束传播过程中满足简单的双曲线变化规律,并且给出了光束传输因子的解析表达式.就高度非傍轴情形,进一步给出了简洁的计算公式,在高斯光源线度趋向零的极限情形下,横向的最大发散角为90°.同时,还推广到了傍轴情形,得到了与原有傍轴公式稍有区别的结果,而且光束传输因子始终保持略大于1最后,对非傍轴矢量高斯光束和非傍轴标量高斯光束的传输进行了比较,结果显示对于线度在两个波长范围之内的高斯光源发散
关键词:
矢量高斯光束
光束传输
非傍轴
二阶矩 相似文献
34.
Based on the vectorial Rayleigh--Sommerfeld integral
formulae, this paper derives the analytical nonparaxial propagation
equation of a super-Lorentz--Gauss (SLG) SLG01 mode beam in
free space. The far field expression and the scalar paraxial result
are treated with special cases of the general formulae.
According to the obtained analytical representation, the nonparaxial
propagation properties of the SLG01 mode beam are illustrated
and analysed with numerical examples. This research provides an
approach to investigate the propagation of the SLG01 mode beam
within the framework of the nonparaxial regime. 相似文献
35.
Starting from the vectorial Rayleigh--Sommerfeld integrals, the
free-space propagation expressions for vectorial
Hermite--Laguerre--Gaussian (HLG) beams beyond the paraxial
approximation are derived. The far-field expressions and the
scalar paraxial results are given as special cases of our
general expressions. The intensity distributions of vectorial
nonparaxial HLG beams are studied and illustrated with numerical
examples. 相似文献
36.
基于非傍轴量论,对普通共轭再现及利用孔径共轭技术再现种情况下大角度环形孔径周视彩虹全息图的色模糊进行了系统地分析,导出相应的表达式,并证明了大参考角及孔径共轭技术的采用并不会便最终像的模糊与普通彩虹全息相比发生明显变化,从而为该类分息图的应用提供了理论依据。 相似文献
37.
This paper derives the closed-form expressions for nonparaxial phase flipped Gaussian (PFG) beams propagating in free space, through a knife edge and an aperture, which enable us to study nonparaxial propagation properties of PFG beams and to compare nonparaxial results with paraxial ones. It is found that the f parameter, offsetting distance of the knife edge and truncation parameter affect the nonparaxial beam propagation properties. Only under certain conditions the paraxial approximation is applicable. The results are illustrated by numerical examples. 相似文献
38.
The concept of partially coherent nonparaxial Hermite-Gaussian (HG) beams is proposed. By using the generalized Rayleigh-Sommerfeld diffraction integral, the closed-form propagation equations of partially coherent nonparaxial HG beams in free space are derived. The on-axis intensity, far-field and paraxial expressions, and specifically, the free-space propagation equations of partially coherent nonparaxial Gaussian Schell-model beams are given, and treated as special cases of our results. It is found that the f and fσ parameters play a crucial role in determining the nonparaxiality of partially coherent TEMmn-mode HG beams. Only if the f and fσ parameters are small enough, the paraxial approximation is applicable. 相似文献
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