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Comparative study of partially coherent vortex beam propagations through atmospheric turbulence along a uplink path and a downlink path

Lü Bai-Da Li Jin-Hong

Comparative study of partially coherent vortex beam propagations through atmospheric turbulence along a uplink path and a downlink path

Lü Bai-Da, Li Jin-Hong
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  • Received Date:  28 June 2010
  • Accepted Date:  08 October 2010
  • Published Online:  15 July 2011

Comparative study of partially coherent vortex beam propagations through atmospheric turbulence along a uplink path and a downlink path

  • 1. (1)Institute of Laser Physics and Chemistry, Sichuan University, Chengdu 610064, China; (2)School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024 , China;Institute of Laser Physics and Chemistry, Sichuan University, Chengdu 610064, China

Abstract: Based on the extended Huygens-Fresnel principle, the propagations of a partially coherent vortex beam through atmospheric turbulence along an uplink path and a downlink path are studied, where the Gaussian Schell-model (GSM) vortex beam is taken as a typical example of partially coherent vortex beam. The analytical expressions for the average intensity, rms width and cross-spectral density function of GSM vortex beam propagating through atmospheric turbulence along a slant path are derived and used to study the influence of atmospheric turbulence along an uplink path and a downlink path on GSM vortex beam propagation and on coherence vortex. It is shown that under the same conditions the influence of atmospheric turbulence along a downlink path on GSM vortex beam propagation is smaller than that along a uplink path, and the conservation distance of the topological charge of GSM vortex beam along a downlink path is longer than that along a uplink path. The results are explained in physics.

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