The formation of quasi-nondiffracting focused beams with second-harmonic generation of flower Laguerre-Gaussian modes

被引：8
|
作者：
Lin, Y. C. [1 ]
Huang, K. F. [1 ]
Chen, Y. F. [1 ]
机构：
[1] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 30050, Taiwan
来源：
LASER PHYSICS | 2013年 / 23卷 / 11期
关键词：
LASER; MICROMANIPULATION; DIFFRACTION; SCALAR; ARRAY;
D O I：
10.1088/1054-660X/23/11/115405
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We theoretically demonstrate that the second-harmonic generation of a flower Laguerre-Gaussian mode can be exploited to form a quasi-nondiffracting focused beam. It is verified that the product of donut Laguerre-Gaussian modes with opposite topological charges leads to the formation of the quasi-nondiffracting focused beam. The divergence of the quasi-nondiffracting focused beam is numerically confirmed to be root 2l + 1 times less than that of the Gaussian TEM00 mode with the same beam waist parameter, where l is the azimuthal index of the flower Laguerre-Gaussian mode. In an experiment, we employ a diode-pumped solid-state laser resonator with intracavity second-harmonic generation to realize the formation of the quasi-nondiffracting focused beams.
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页数：6
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