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26 January 2016Pattern characteristics of laser beams in a ground-to-satellite optical link
Due to influence of atmosphere turbulence, distribution characteristics of laser speckles vary with propagation distances. In this paper, numerical calculation using a multiple-phase screen method is performed to simulate the propagation of laser beam in the turbulence. The distributions of intensity at different distances are calculated. A characteristic factor σ 2 is proposed to quantify the degree of turbulence induced intensity spatial fluctuation compared with the same beam propagating in vacuum. The results show that, at the same distance, mean σ 2 of the beam propagating perpendicularly is smaller than the beam propagating horizontally. For a perpendicularly transmitted Gaussian beam, mean σ 2 decreases gradually after it reaches its maximum value, and tends to be stable if the propagation distance is long enough.
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Guangsen Ren, Qianrong Chen, Yongwang Hao, Wenpan Zhang, Hua Li, Yanbin Wang, Rongzhen Zhu, "Pattern characteristics of laser beams in a ground-to-satellite optical link," Proc. SPIE 9796, Selected Papers of the Photoelectronic Technology Committee Conferences held November 2015, 97960L (26 January 2016); https://doi.org/10.1117/12.2230650