Propagation of the off-axis superposition of partially coherent beams through atmospheric turbulence
Zhang En-Tao(张恩涛)a)b), Ji Xiao-Ling(季小玲)c), and Lü Bai-Da(吕百达)a)†
aInstitute of Laser Physics and Chemistry, Sichuan University, Chengdu 610064, China; bSchool of Sciences of Southwest Petroleum University, Chengdu 610500, China; cCollege of Electronic Engineering, Sichuan Normal University, Chengdu 610066, China
Abstract The propagation properties of the off-axis superposition of partially coherent beams through atmospheric turbulence and their beam quality in terms of the mean-squared beam width $w(z)$ and the power in the bucket (PIB) are studied in detail, where the effects of partial coherence, off-axis beam superposition and atmospheric turbulence are considered. The analytical expressions for the intensity, the beam width and the PIB are derived, and illustrative examples are given numerically. It is shown that the maximum intensity Imax and the PIB decrease and $w(z)$ increases as the refraction index structure constant Cn2 increases. Therefore, the turbulence results in a degradation of the beam quality. However, the resulting partially coherent beam with a smaller value of spatial correlation parameter $\gamma$ and larger values of separate distance xd and beam number M is less affected by the turbulence than that with a larger value of $\gamma$ and smaller values of xd and M. The main results obtained in this paper are explained physically.
Received: 14 November 2007
Revised: 30 June 2008
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 60778048).
Cite this article:
Zhang En-Tao(张恩涛), Ji Xiao-Ling(季小玲), and Lü Bai-Da(吕百达) Propagation of the off-axis superposition of partially coherent beams through atmospheric turbulence 2009 Chin. Phys. B 18 571
[1]
High power semiconductor laser array with single-mode emission Peng Jia(贾鹏), Zhi-Jun Zhang(张志军), Yong-Yi Chen(陈泳屹), Zai-Jin Li(李再金), Li Qin(秦莉), Lei Liang(梁磊), Yu-Xin Lei(雷宇鑫), Cheng Qiu(邱橙), Yue Song(宋悦), Xiao-Nan Shan(单肖楠), Yong-Qiang Ning(宁永强), Yi Qu(曲轶), and Li-Jun Wang(王立军). Chin. Phys. B, 2022, 31(5): 054209.
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
