A further study on the spreading and directionality of Gaussian array beams in non-Kolmogorov turbulence

doi:10.1088/1674-1056/23/6/064209

Abstract It is found that in free space, the curves of the mean-squared beam width may each have a cross point at a certain propagation distance z_c. For Gaussian array beams, the analytical expressions of z_c are derived. For the coherent combination, z_c is larger than that for the incoherent combination. However, in non-Kolmogorov turbulence, the cross point disappears, and the Gaussian array beams will have the same directionality in terms of the angular spread. Furthermore, a short propagation distance is needed to reach the same directionality when the generalized exponent is equal to 3.108. In particular, it is shown that the condition obtained in previous studies is not necessary for laser beams to have the same directionality in turbulence, which is explained physically. On the other hand, the relative average intensity distributions at the position where the Gaussian array beams have the same mean-squared beam width are also examined.

Keywords: cross point of curves of the mean-squared beam width spreading and directionality non-Kolmogorov turbulence Gaussian array beams

Received: 21 September 2013
Revised: 04 November 2013
Accepted manuscript online:

PACS:	42.68.Bz	(Atmospheric turbulence effects)
	42.25.Bs	(Wave propagation, transmission and absorption)
	42.25.Dd	(Wave propagation in random media)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61178070) and the Construction Plan for Scientific Research Innovation Teams of Universities in Sichuan Province, China (Grant No. 12TD008).

Corresponding Authors: Ji Xiao-Ling
E-mail: jiXL100@163.com

Cite this article:

Lu Lu (陆璐), Ji Xiao-Ling (季小玲), Deng Jin-Ping (邓金平), Li Xiao-Qing (李晓庆) A further study on the spreading and directionality of Gaussian array beams in non-Kolmogorov turbulence 2014 Chin. Phys. B 23 064209

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A further study on the spreading and directionality of Gaussian array beams in non-Kolmogorov turbulence

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