海洋turbulence对载轨道angular momentum的Airy涡旋光束传输的影响
Influence of oceanic turbulence on propagation of Airy vortex beam carrying orbital angular momentum
摘要：
利用Rytov近似理论，推导了携带轨道角动量的Airy涡旋光束通过各向异性弱海洋湍流的探测概率的解析表达式。研究了湍流参数和光束参数对Airy-OAM光束传输特性的影响。数值模拟结果表明，各向异性海洋湍流具有较低的温度方差耗散率、较小的温盐比对折射率谱的贡献率、较高的单位质量流体动能耗散率、较大的内尺度因子、较大的各向异性系数，导致Airy-OAM光束具有较大的探测概率。此外，Airy-OAM光束具有较小的拓扑电荷、较大的主环半径和较长的波长，具有较强的抗海洋湍流干扰能力。此外，随着接收孔径的增大，探测概率降低。与拉盖尔-高斯-OAM光束相比，当Airy-OAM光束的拓扑荷数大于5时，由于Airy-OAM光束的无衍射和自愈特性，其抗湍流干扰能力更强。研究结果对使用Airy-OAM波束的水下光通信链路具有一定的参考价值。
英文摘要：
With Rytov approximation theory, we derive the analytic expression of detection probability of Airy vortex beam carrying orbital angular momentum (OAM) through an anisotropic weak oceanic turbulence. We investigate the influences of turbulence parameters and beam parameters on the propagation properties of Airy-OAM beam. The numerical simulation results show that the anisotropic oceanic turbulence with a lower dissipation rate of temperature variance, smaller ratio of temperature and salinity contributions to the refractive index spectrum, higher dissipation rate of kinetic energy per unit mass of fluid, bigger inner scale factor, larger anisotropic coefficient causes the larger detection probability of Airy-OAM beam. Moreover, the Airy-OAM beam with a smaller topological charge, larger main ring radius and longer wavelength, has strong resistance to oceanic turbulent interference. Additionally, the detection probability decreases with the increase of receiving aperture size. In comparison with Laguerre-Gaussian-OAM beam, Airy-OAM beam has more anti-interference to turbulence when its topological charge is larger than 5 due to its non-diffraction and self-healing characteristics. The results are useful for underwater optical communication link using Airy-OAM beam.
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