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涡旋光束在海洋湍流中传输的闪烁因子

Scintillation Index of Vortex Beams Propagating in Oceanic Turbulence

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摘要

采用分步相位屏方法仿真涡旋光束在海洋中的传输,并对涡旋光束在海洋湍流中传输的光强和闪烁因子进行仿真计算。研究发现,随着传输距离的增加,涡旋光束的光斑逐渐扩散开来,且中心暗斑也在逐渐消失。通过改变湍流相位屏参数模拟不同强度的海洋湍流,发现随着均方温度耗散率变大,或温度、盐度波动的相对强度变大,或单位质量液体中的湍流动能耗散率变小,涡旋光束的轴上点闪烁因子也会变大。当传输距离达到一定值时,涡旋光束的闪烁因子会逐渐低于高斯光束,且拓扑荷数越大闪烁因子降低得越明显。

Abstract

The intensity and scintillation index of vortex beams propagating in the oceanic turbulence are simulated by using a step-by-step phase screen method. We find that the vortex beam spot diffuses gradually and the central dark spot gradually disappears with increase in the propagation distance. By changing the parameters of the turbulent phase screen to simulate the oceanic turbulence with different strengths, we find that the on-axis scintillation index of the vortex beam increases with increase of the mean-square temperature dissipation rate, increase of the relative strength of temperature and salinity fluctuations, or decrease of turbulent kinetic energy dissipation rate per unit mass of fluid. The scintillation index of the vortex beam is lower than that of the Gaussian beam when the propagation distance reaches a certain value, and the larger the topological charge is, the more rapidly the scintillation index descends.

Newport宣传-MKS新实验室计划
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DOI:10.3788/CJL201946.0705001

所属栏目:光束传输与控制

基金项目:国家自然科学基金、华侨大学研究生科研创新基金;

收稿日期:2018-12-28

修改稿日期:2019-03-07

网络出版日期:2019-07-01

作者单位    点击查看

张凯宁:华侨大学信息科学与工程学院, 福建省光传输与变换重点实验室, 厦门 福建 361021
刘永欣:华侨大学信息科学与工程学院, 福建省光传输与变换重点实验室, 厦门 福建 361021
蒲继雄:华侨大学信息科学与工程学院, 福建省光传输与变换重点实验室, 厦门 福建 361021

联系人作者:刘永欣(yongxin@hqu.edu.cn)

备注:国家自然科学基金、华侨大学研究生科研创新基金;

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引用该论文

Kaining Zhang, Yongxin Liu, Jixiong Pu. Scintillation Index of Vortex Beams Propagating in Oceanic Turbulence[J]. Chinese Journal of Lasers, 2019, 46(7): 0705001

张凯宁, 刘永欣, 蒲继雄. 涡旋光束在海洋湍流中传输的闪烁因子[J]. 中国激光, 2019, 46(7): 0705001

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