Effect of aspheric particles on laser polarization characteristics

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% and 24% 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.