Consistency of the directionality of partially coherent beams inturbulence expressed in terms of the angular spread and the far-field average intensity

doi:10.1088/1674-1056/19/2/024203

中国物理B ›› 2010, Vol. 19 ›› Issue (2): 24203-024203.doi: 10.1088/1674-1056/19/2/024203

Consistency of the directionality of partially coherent beams inturbulence expressed in terms of the angular spread and the far-field average intensity

陈晓文, 季小玲

Department of Physics, Sichuan Normal University, Chengdu 610068, China

收稿日期:2008-12-23 修回日期:2009-05-26 出版日期:2010-02-15 发布日期:2010-02-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No.~60778048).

Consistency of the directionality of partially coherent beams inturbulence expressed in terms of the angular spread and the far-field average intensity

Chen Xiao-Wen(陈晓文) and Ji Xiao-Ling(季小玲)^†

Department of Physics, Sichuan Normal University, Chengdu 610068, China

Received:2008-12-23 Revised:2009-05-26 Online:2010-02-15 Published:2010-02-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No.~60778048).

摘要/Abstract

摘要： Under the quadratic approximation of the Rytov's phase structure function, this paper derives the general closed-form expressions for the mean-squared width and the angular spread of partially coherent beams in turbulence. It finds that under a certain condition different types of partially coherent beams may have the same directionality as a fully coherent Gaussian beam in free space and also in atmospheric turbulence if the angular spread is chosen as the characteristic parameter of beam directionality. On the other hand, it shows that generally, the directionality of partially coherent beams expressed in terms of the angular spread is not consistent with that in terms of the normalized far-field average intensity distribution in free space, but the consistency can be achieved due to turbulence.

Abstract: Under the quadratic approximation of the Rytov's phase structure function, this paper derives the general closed-form expressions for the mean-squared width and the angular spread of partially coherent beams in turbulence. It finds that under a certain condition different types of partially coherent beams may have the same directionality as a fully coherent Gaussian beam in free space and also in atmospheric turbulence if the angular spread is chosen as the characteristic parameter of beam directionality. On the other hand, it shows that generally, the directionality of partially coherent beams expressed in terms of the angular spread is not consistent with that in terms of the normalized far-field average intensity distribution in free space, but the consistency can be achieved due to turbulence.

Key words: turbulence, partially coherent beam, angular spread, far-field average intensity

中图分类号: (Atmospheric turbulence effects)

42.68.Bz

42.68.Ay (Propagation, transmission, attenuation, and radiative transfer) 02.30.Mv (Approximations and expansions)

陈晓文, 季小玲. Consistency of the directionality of partially coherent beams inturbulence expressed in terms of the angular spread and the far-field average intensity[J]. 中国物理B, 2010, 19(2): 24203-024203.

Chen Xiao-Wen(陈晓文) and Ji Xiao-Ling(季小玲). Consistency of the directionality of partially coherent beams inturbulence expressed in terms of the angular spread and the far-field average intensity[J]. Chin. Phys. B, 2010, 19(2): 24203-024203.

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Consistency of the directionality of partially coherent beams inturbulence expressed in terms of the angular spread and the far-field average intensity

Consistency of the directionality of partially coherent beams inturbulence expressed in terms of the angular spread and the far-field average intensity

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