FOCUSING A GAUSSIAN LASER-BEAM WITHOUT FOCAL SHIFT

被引：22

作者：

YOSHIDA, A

ASAKURA, T

机构：

[1] Research Institute for Electronic Science, Hokkaido University, Sapporo, Hokkaido

来源：

OPTICS COMMUNICATIONS | 1994年 / 109卷 / 5-6期

关键词：

D O I：

10.1016/0030-4018(94)90483-9

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

It is shown for the first time that the focal shift of a Gaussian laser beam can be offset with the use of the spherical aberration of a focusing lens. The diffraction integral, in the presence of aberrations, which is applicable to a low Fresnel number focusing system is derived. A new approximate formula is proposed for the normalized axial intensity in the presence of aberrations. This formula reduces to an exact formula for a nontruncated, aberration-free Gaussian beam. The expression for the coefficient of spherical aberration required to offset the focal shift is given as a function of the Fresnel number of the beam. The axial intensity distributions of Gaussian beams with the spherical aberration are presented, predicting the focusing without the focal shift.

引用

页码：368 / 374

页数：7

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