Browsing by Author "Liu, Xianlong"
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Article Citation Count: Peng, XF...et al. (2016). Propagation of a radially polarized twisted Gaussian Schell-model beam in turbulent atmosphere. Journal of Optics, 18(12). http://dx.doi.org/10.1088/2040-8978/18/12/125601Propagation of a radially polarized twisted Gaussian Schell-model beam in turbulent atmosphere(IOP Publishing Ltd, 2016) Peng, Xiaofeng; Liu, Lin; Yu, Jiayi; Liu, Xianlong; Cai, Yangjian; Baykal, Yahya; Li, Wei; 7812Propagation properties of a scalar twisted Gaussian Schell-model (TGSM) beam in turbulent atmosphere has been studied in detail. In this paper, we explore the propagation properties of a radially polarized TGSM beam in turbulent atmosphere. Analytical formulae for the elements of the cross-spectral density matrix of a radially polarized TGSM beam propagating in turbulent atmosphere are derived based on the extended Huygens-Fresnel integral. We find that the atmospheric turbulence induces degeneration of the intensity distribution and depolarization of a radially polarized TGSM beam on propagation, while the twist phase plays a role in antidegradation and anti-depolarization. Furthermore, we also find that the twist phase induces not only the rotation of the beam spot but also changes of the state of polarization on propagation, which are caused by the fact that the twist phase imposes orbital angular momentum on the beam. Thus, the twist phase can be used to control the propagation properties of radially polarized partially coherent beam. Our results will be useful in some applications, such as optical trapping and free-space optical communications.Article Citation Count: Yuan, Y...et al. (2013). Scintillation index of a multi-Gaussian Schell-model beam in turbulent atmosphere. Optics Communications, 305, 57-65. http://dx.doi.org/10.1016/j.optcom.2013.04.076Scintillation index of a multi-Gaussian Schell-model beam in turbulent atmosphere(Elsevier Science Bv, 2013) Yuan, Yangsheng; Liu, Xianlong; Wang, Fei; Chen, Yahong; Cai, Yangjian; Qu, Jun; Eyyuboğlu, Halil T.; 7688Multi-Gaussian Schell-model (MGSM) beam was introduced recently [Sahin and Korotkova, Opt. Lett. 37 (2012) 2970; Korotkova et al., J. Opt. Soc. Am. A 29 (2012) 2159]. In this paper, an explicit expression for the scintillation index of a multi-Gaussian Schell-model (MGSM) beam in weakly or extremely strong turbulent atmosphere is derived with the help of a tensor method. Applying the derived formulae, the scintillation properties of a MGSM beam and a GSM beam in weakly or extremely strong turbulent atmosphere are studied numerically and comparatively. Our results show that a MGSM beam has advantage over a GSM beam for reducing turbulence-induced scintillation, which will be useful for long-distance free-space optical communications.Article 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.2012.05.028Scintillation 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.; 7688We 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
