Focal switch of cosine-squared Gaussian beams passing through an astigmatic lens

MU Guo-qiang; WANG Li; WANG Xi-qing

doi:10.3969/j.issn.1001-3806.2011.04.030

In order to analyze the focal switch phenomena of cosine-squared Gaussian beams passing through an astigmatic lens,the expression for the axial irradiance distribution of focused cosine-squared Gaussian beams was derived based on the Collins formula.By means of numerical calculation,effect of astigmatic parameter on the axial irradiance was obtained.The dependence of the relative focal shift on the astigmatic parameter was studied at different positions of the beam's incident plane for a particular beam parameter and Fresnel number; the range of the beam's incident position of dual focal switches under this condition was determined and the focal switch due to the astigmatism was interpreted.

Focal switch of cosine-squared Gaussian beams passing through an astigmatic lens

Corresponding author: MU Guo-qiang, xqwang@home.swjtu.edu.cn;

1. College of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China

Received Date: 2010-10-19

Accepted Date: 2011-01-17

Available Online: 2011-07-25

Abstract: In order to analyze the focal switch phenomena of cosine-squared Gaussian beams passing through an astigmatic lens,the expression for the axial irradiance distribution of focused cosine-squared Gaussian beams was derived based on the Collins formula.By means of numerical calculation,effect of astigmatic parameter on the axial irradiance was obtained.The dependence of the relative focal shift on the astigmatic parameter was studied at different positions of the beam's incident plane for a particular beam parameter and Fresnel number; the range of the beam's incident position of dual focal switches under this condition was determined and the focal switch due to the astigmatism was interpreted.

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Reference (14)

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Focal switch of cosine-squared Gaussian beams passing through an astigmatic lens

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