非球型粒子对激光偏振特性的影响

Effect of aspheric particles on laser polarization characteristics

球形粒子群的偏振散射特性已经通过研究获得,但是真实环境中粒子形状为非球形,非球型粒子的多次散射偏振特性规律尚未得到。基于T矩阵计算方法对非球型粒子散射模型进行了改进,获得了非球型粒子的散射振幅矩阵,对椭球形粒子,圆柱形粒子以及且切比雪夫粒子的偏振特性进行了模拟,分析了不同横纵轴比、形状、波长对粒子偏振特性的影响。研究结果表明:对于椭球形粒子而言,偏心率由2变为3后偏振度最大值从散射角130°变为90°,450、532、671 nm的偏振度分别增大了50%、25%、24%;圆柱粒子长短轴互换对于偏振度的改变影响不大。切比雪夫粒子表面的不规则度由3变为8后,偏振度增大了18%。研究结果为非球型粒子群的多次散射特性提供了理论基础,最终解决了真实环境与理想环境之间的偏振传输特性差异的问题。

The polarization scattering characteristics of spherical particle swarm have been studied,but in the real environment,the shape of particles is non-spherical,and the multiple scattering polarization characteristics of non-spherical particles have not been obtained.The aspheric particle scattering model was improved based on the T matrix calculation method to obtain the scattering amplitude matrix of aspheric particles.The influence of different horizontal and vertical axis ratios,shape and wavelength on the polarization characteristics of ellipsoidal particles,cylindrical particles and Chebyshev particles were analyzed by computer simulation.The results show that for ellipsoid particles,the maximum polarization degree changes from 130°to 90°after the eccentricity changes from 2 to 3,and the polarization degrees of 450 nm,532 nm and 671 nm increases by 50%,25%and24%respectively.Cylindrical particle long and short axis interchange has little effect on the change of polarization.The surface irregularity of Chebyshev particles changes from 3 to 8,the polarization degree increases by 18%.The research results provide a theoretical basis for the multiple scattering characteristics of the aspheric particle group,finally solve the problem of the difference in polarization transmission characteristics between the real environment and the ideal environment.