贝塞尔高斯光束在各向异性湍流中的传输特性

采用随机相位屏仿真方法模拟了各向异性大气湍流及贝塞尔高斯涡旋光束在其中的强度分布、在轴闪烁指数和抖动效应, 分析了各向异性湍流参数和波源参数对涡旋光束传输质量的影响.结果表明, 在各向异性大气湍流中, 贝塞尔高斯涡旋光束的强度分布随传输距离的变化情况与离轴距离有关, 仅一级圆环处强度值单调递减, 其余次级圆环处强度值均呈现先增后降的趋势.在近距离处, 贝塞尔高斯涡旋光束的在轴闪烁指数随波形参数的增大而减小, 随光束宽度的增大呈现先上升后下降再上升的趋势, 该现象与贝塞尔高斯光束的光斑尺寸大小相关; 其抖动效应随波形参数、拓扑荷数量、波长和束腰半径的增大而减弱.但在远距离处贝塞尔高斯涡旋光束的闪烁效应和抖动效应随波形参数的影响与近距离处相反, 这与贝塞尔高斯光束的展宽突然增大的现象一致.贝塞尔高斯涡旋光束在各向异性湍流大气中的抖动效应小于在各向同性湍流大气中的情况, 并且在远距离处大于拉盖尔高斯涡旋光束的抖动效应.

Abstract

The multiple random phase screen simulation method is used to simulate the anisotropic turbulent atmosphere and Bessel-Gaussian beam in intensity distribution, the on-axis scintillation and beam wander. The effects of anisotropic turbulence parameters and wave source parameters on the propagation quality of Bessel-Gasuuain beam are analyzed. The results show that the intensity distribution of Bessel-Gaussian beam in anisotropic turbulent atmosphere is related to the off-axis distance. Only the intensity value at the first ring decreases monotonously, while the intensity value at the other secondary rings increases first and then decreases. The on-axis scintillation index of the Bessel-Gaussian beam at close range decreases with the increase of the waveform parameter, and there is a trend of first rising, then falling and then rising with the increase of beam width. This phenomenon is related to the beam width of Bessel-Gaussian beam. The beam wander decreases with increases of the waveform parameter, the number of orbital angular momentum, the wavelength and the beam width. However, at a long distance, its on-axis scintillation index and beam wander effect are opposite to that of near distance, which is consistent with the sudden increase of the width of Bessel-Gaussian beam. The wander effect of Bessel-Gaussian beam in anisotropic turbulent atmosphere is significantly less than that in isotropic turbulence atmosphere, and the result even larger than Laguerre-Gaussian beam at long distance.

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孙日东, 郭立新, 程明建, 闫旭, 李江挺. 贝塞尔高斯光束在各向异性湍流中的传输特性[J]. 光子学报, 2018, 47(12): 1201002. SUN Ri-dong, GUO Li-xin, CHENG Ming-jian, YAN Xu, LI Jiang-ting. Propagation Characteristics of Bessel-Gaussian Beam in Anisotropic Atmosphere[J]. ACTA PHOTONICA SINICA, 2018, 47(12): 1201002.

贝塞尔高斯光束在各向异性湍流中的传输特性

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