21 February 2014 Scintillation analysis for multiple uplink Gaussian beams in the presence of beam wander
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Abstract
For a beam from ground to space, the main optical turbulence effects are scintillation and beam wander. Multiple incoherent beams can reduce the scintillation. The scintillation is determined by the number of the beams, the beam separation and the size of the beam wander variance. A wave optics simulation was applied to study the scintillation index of 1-, 3, 6 collimated uplink Gaussian beams, where a hexagonal close-pack spacing is used. Based on the results of simulations, we propose an approximation to average spatial correlation in terms of the beam separation in the tracked and untracked cases. The relation between scintillation index and beam separation is different in the weak and moderately-strong fluctuation regimes when the number of beams is the same. And the average spatial correlation is determined by the beam waist radius, beam separation and beam wander variance.
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Wu-ming Wu, Wu-ming Wu, Yu Ning, Yu Ning, Peng-fei Zhang, Peng-fei Zhang, Xiao-xing Feng, Xiao-xing Feng, Chun-hong Qiao, Chun-hong Qiao, } "Scintillation analysis for multiple uplink Gaussian beams in the presence of beam wander", Proc. SPIE 9142, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics: Optical Imaging, Remote Sensing, and Laser-Matter Interaction 2013, 914223 (21 February 2014); doi: 10.1117/12.2057683; https://doi.org/10.1117/12.2057683
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