Regions of spreading of partially coherent beams propagating through non-Kolmogorov turbulence

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• 作者：Xiaoling Ji^a ; ^{jiXL100@163.com" class="auth_mail} ; Zhengcai Pu^a ; Guangming Ji^b ; Xinhong Jia^a
• 关键词：Regions of spreading ; Partially coherent beam ; Non-Kolmogorov turbulence
• 刊名：Optics Communications
• 出版年：1 July, 2014
• 年：2014
• 卷：322
• 期：Complete
• 页码：109-113
• 全文大小：458 K

文摘

In this paper, the regions of spreading of partially coherent beams propagating through non-Kolmogorov turbulence are examined by using the turbulence distances z_T and z_TT. The spreading is less affected by atmospheric turbulence (AT) when z<z_T, while the spreading is dominated by AT when z>z_TT. The dependence of z_T and z_TT on the turbulence parameters and the beam parameters is studied in detail. It is found that both z_T and z_TT reach their minimums when the fractal constant of the atmospheric power spectrum is equal to 3.11. However, the dependence of z_TT on turbulence parameters and beam parameters is much larger than that of z_T. There exists a minimum of z_T versus the waist width, but z_TT decreases monotonically as the waist width increases. On the other hand, the relation between the turbulence distance z_T and the Rayleigh range z_R is investigated. It is shown that z_T=z_R may appear when a suitable waist width or a suitable coherent parameter is chosen. For the small free-space diffraction (FD) case z_T<z_R may hold, but for the large FD case it may be z_T>z_R. Some physical explanations for the results obtained in this paper are also given.