Mr. Qiyong Liang Profile

Qiyong Liang

at Jiangnan Univ

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Publications (2)

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Proceedings Article | 10 November 2020 Paper

M2-factor and wander of Mathieu Gaussian-Schell beam in oceanic turbulence

Hongbin Yang, Qiyong Liang, Yixin Zhang

Proceedings Volume 11604, 116040I (2020) https://doi.org/10.1117/12.2583600

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Consider the evolution of the wander and M2-factor of Mathieu Gaussian-Schell beam in turbulent ocean. We develop models for wander and M2-factor of this beam based the theory of wigner distribution function. The influences of the oceanic parameters on the wander and M2-factor are discussed in detail. It is found that as the propagation distance, the dissipation rate of temperature variance, the eddy diffusivity ratio and ratio of temperature and salinity contributions to the refractive-index spectrum increases, both M2-factor and beam wander increase; but M2-factor and beam wander increase with the decreasing of initial beam width, the kinetic energy per unit mass of fluid. However, as the variation of ellipticity factor and OAM quantum number increase, the evolution of M2-factor and beam wander are some complexes. The influences of coherent width of light source and wavelength on the M2-factor and beam wander are negligible. Our results are helpful in the design of an optical communication system in an oceanic environment.

Proceedings Article | 20 December 2019 Paper

Long-term beamwidth and quivering of a modified Bessel Gaussian Schell vortex beam in oceanic turbulence

Qiyong Liang, Yixin Zhang, Shibao Deng, Lin Yu

Proceedings Volume 11209, 1120918 (2019) https://doi.org/10.1117/12.2543853

KEYWORDS: Turbulence, Beam propagation method, Optical communications, Laser beam propagation

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The long-term beamwidth and quivering of modified Bessel Gaussian Schell vortex beam in oceanic turbulence are derived based on the extended Huygens-Fresnel principle. With the help of these models, we analyze the effect of vortex beam and turbulence parameters on long-term beamwidth and beam quivering. We find that modified Bessel Gaussian Schell vortex beam has smaller beam quivering when beam has higher orbital angular momentum quantum number, larger beam waist, larger width parameter, longer wavelength and lower coherent length. We also find that turbulence of large temperature-salinity contribution ratio, large inner scale of turbulence, large outer scale of turbulence and small rate of dissipation of the kinetic energy per unit mass of fluid is more likely to cause beam quivering. The variation trends of long-term beamwidth with beam parameters are opposite to that of beam quivering.

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