Focal shift in the axisymmetric Bessel-modulated Gaussian beam

被引：25

作者：

Hricha, Z ^{[1
]}

Belafhal, A ^{[1
]}

机构：

[1] Univ Chouaib Doukkali, Fac Sci, Dept Phys, Phys Mol Lab, El Jadida 24000, Mexico

来源：

OPTICS COMMUNICATIONS | 2005年 / 255卷 / 4-6期

关键词：

focal shift; Bessel-modulated Gaussian beam (QBG beam); axisymmetric QBG beam; band width; encircled-power criterion;

D O I：

10.1016/j.optcom.2005.06.025

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The focal shift of the axisymmetric Bessel-modulated Gaussian beam with quadratic radial dependence (QBG beam) is investigated by using two different approaches. The first approach is based on the encircled-power criterion and the second one is the conventional method based on the axial irradiance. In this last case, a third-order equation governing the amount the relative focal shift is derived. Moreover, it is shown from numerical calculation results that the two approaches provide mainly the same results; the focal shift of the axisymmetric QBG beam depend on the Gaussian Fresnel number N-w and the beam parameter mu. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：235 / 240

页数：6

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