Browsing by Author "Liang, Chunhao"

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Citation Count: Yuan, Y...et al. (2013). Effect of spatial coherence on the scintillation properties of a dark hollow beam in turbulent atmosphere. Applied Physisc B-Lasers And Optics, 110(4), 519-529. http://dx.doi.org/10.1007/s00340-012-5288-y
Effect of spatial coherence on the scintillation properties of a dark hollow beam in turbulent atmosphere
(Springer, 2013) Yuan, Yangsheng; Chen, Yahong; Liang, Chunhao; Cai, Yangjian; Baykal, Yahya; 7812
With the help of a tensor method, we derive an explicit expression for the on-axis scintillation index of a circular partially coherent dark hollow (DH) beam in weakly turbulent atmosphere. The derived formula can be applied to study the scintillation properties of a partially coherent Gaussian beam and a partially coherent flat-topped (FT) beam. The effect of spatial coherence on the scintillation properties of DH beam, FT beam and Gaussian beam is studied numerically and comparatively. Our results show that the advantage of a DH beam over a FT beam and a Gaussian beam for reducing turbulence-induced scintillation increases particularly at long propagation distances with the decrease of spatial coherence or the increase of the atmospheric turbulence, which will be useful for long-distance free-space optical communications
Citation Count: Liu, X...et al. (2013). Scintillation properties of a truncated flat-topped beam in a weakly turbulent atmosphere. Optics and Laser Technology, 45, 587-592. http://dx.doi.org/10.1016/j.optlastec.2012.05.028
Scintillation properties of a truncated flat-topped beam in a weakly turbulent atmosphere
(Elsevier Science Ltd, 2013) Liu, Xianlong; Liang, Chunhao; Yuan, Yangsheng; Cai, Yangjian; Eyyuboğlu, Halil T.; 7688
We derive derive an explicit expression for the scintillation index of a truncated flat-topped (FT) beam in a weakly turbulent atmosphere. Under suitable conditions, the derived formula reduces to the expression for the scintillation index of a FT beam or Gaussian beam without truncation. The scintillation properties of a truncated FT beam in a weakly turbulent atmosphere are illustrated numerically. It is found that the truncation parameter has strong influence on the scintillation properties, and the advantage of a FT beam over a Gaussian beam for reducing the negative influence of turbulence disappears gradually as the truncation parameter decreases