中国物理B ›› 2014, Vol. 23 ›› Issue (6): 64209-064209.doi: 10.1088/1674-1056/23/6/064209
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
陆璐, 季小玲, 邓金平, 李晓庆
Lu Lu (陆璐), Ji Xiao-Ling (季小玲), Deng Jin-Ping (邓金平), Li Xiao-Qing (李晓庆)
摘要: 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 zc. For Gaussian array beams, the analytical expressions of zc are derived. For the coherent combination, zc 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.
中图分类号: (Atmospheric turbulence effects)