贝塞尔函数
衍射
光学
物理
菲涅耳数
光圈(计算机存储器)
角孔径
菲涅耳积分
横截面
梁(结构)
菲涅耳衍射
贝塞尔光束
高斯光束
光束发散
光束直径
焦距
激光束
镜头(地质)
激光器
工程类
结构工程
声学
作者
P. L. Overfelt,Charles Kenney
标识
DOI:10.1364/josaa.8.000732
摘要
We use the scalar Kirchhoff–Huygens diffraction integral to obtain analytic expressions for both axial and transverse intensity distributions, assuming normal incidence on a circular aperture for four types of incident field: (1) plane wave, (2) Bessel beam, (3) Gaussian beam, and (4) Bessel–Gauss beam. We use the Fresnel approximation to obtain the axial intensity as a function of distance from the aperture. We consider both Fresnel and Fraunhofer diffraction for the case of the transverse intensity distributions. For the axial case, we find that the Bessel–Gauss beam performs worse than the Bessel beam, in terms both of the magnitude of intensity and of its ability to extend a distance from the aperture. In the transverse case, we find that the Bessel–Gauss beam performance in terms of remaining nearly diffraction free over a given distance is highly dependent on the relationship among the aperture radius, the beam waist parameter, and the transverse wave number.
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