Far-field divergence angle of nonparaxial rotationally symmetric Laguerre-Gaussian beams

KANG Xiao-ping; L&#220; Bai-da

LASER TECHNOLOGY > 2006 > 30(2): 181-182,185.

KANG Xiao-ping, LÜ Bai-da. Far-field divergence angle of nonparaxial rotationally symmetric Laguerre-Gaussian beams[J]. LASER TECHNOLOGY, 2006, 30(2): 181-182,185.

Citation:

KANG Xiao-ping, LÜ Bai-da. Far-field divergence angle of nonparaxial rotationally symmetric Laguerre-Gaussian beams[J]. LASER TECHNOLOGY, 2006, 30(2): 181-182,185.

Citation:

KANG Xiao-ping, LÜ Bai-da. Far-field divergence angle of nonparaxial rotationally symmetric Laguerre-Gaussian beams[J]. LASER TECHNOLOGY, 2006, 30(2): 181-182,185.

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Far-field divergence angle of nonparaxial rotationally symmetric Laguerre-Gaussian beams

KANG Xiao-ping^1,2,
LÜ Bai-da^2, ,

1.
Department of Physics, Qiongzhou University, Wuzhishan 572200, China;
2.
Institute of Laser Physics and Chemistry, Sichuan University, Chengdu 610064, China

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Received Date: November 07, 2004
Revised Date: February 23, 2005
Published Date: March 24, 2006

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Abstract

Based on the second-order moment of the power density,the far-field divergence angle of nonparaxial rotationally symmetric Laguerre-Gaussian(LG) beams is derived and expressed in a sum of the series of the Gamma function.It is shown that the far-field divergence angle of nonparaxial rotationally LG beams approaches to an asymptotic value of 63.435° as the initial waist-width to wavelength ratio w0/λ approaches zero,which is independent of the order.For the special case of p=0 our result reduces to that of nonparaxial Gaussian beams.
- laser optics,
- nonparaxial Laguerre-Gaussian(LG) beam,
- power density,
- divergence angle

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