径向偏振高阶贝塞尔-高斯涡旋光束在海洋湍流中的传输特性

Propagation Characteristics of Radially Polarized High-order Bessel-Gaussian Vortex Beams in Ocean Turbulence

采用分步相位屏的方法,研究了径向偏振高阶贝塞尔-高斯涡旋光束在海洋湍流中的光强特性和闪烁特性.研究发现,径向偏振高阶贝塞尔-高斯涡旋光束传输一段距离后,其中心区域光强受自身特性的影响;对于不同强度的海洋湍流,随着均方温度耗散率的增大,光束所对应的轴上区域的闪烁因子也越大.相较于线偏振光束和径向偏振光束,径向偏振高阶贝塞尔-高斯涡旋光束在海洋湍流中的传输受湍流的影响较小.研究还发现,传输一段距离后,径向偏振高阶贝塞尔-高斯涡旋光束(n≥1)的拓扑荷数越高,光束所对应的闪烁因子越小.另外,相对于径向偏振高阶贝塞尔-高斯涡旋光束(n≥1),拓扑荷数n=0的径向偏振零阶贝塞尔-高斯涡旋光束具有较低的闪烁因子.

The intensity and scintillation characteristics of radially polarized high-order Bessel-Gaussian vortex beams in ocean turbulence were studied using the stepwise phase screen method.It was found that the intensity in the central region of a radially polarized high-order Bessel-Gaussian vortex beam is influenced by its intrinsic properties after travelling a certain distance.For ocean turbulence with varying intensities,the scintillation fac-tor in the axial region corresponding to the beam increases as the mean square temperature dissipation rate rises.Compared with linearly polarized beams and radially polarized beams,radially polarized high-order BesselGaussian vortex beams are less affected by ocean turbulence.It was also found that,after propagating a certain beams,the higher the topological charge number(n≥1)of a radially polarized high-order Bessel-Gaussian vor-tex beam,the smaller the scintillation factor.Additionally,the radially polarized zero-order Bessel-Gaussian vortex beam(n=0)exhibits a lower scintillation factor compared to the radially polarized high-order BesselGaussian vortex beam(n≥1).