瞬态效应和偏振特性对于短脉冲激光在散射性介质中的传输有重要影响.本文采用蒙特卡洛法来求解一维散射性介质内的瞬态偏振辐射传输问题.采用拒绝法确定光束的散射方向.定义了瞬态矢量辐射传输矩阵(TVRTM)来描述瞬态偏振辐射的传输特性,并以此得到了Stokes矢量的角度与时间分布.在蒙特卡洛模型中采用时间平移和叠加原理,可大幅度提高计算精度和计算效率.
The characteristics of the transient and polarization have significant effect on a short-pulse laser transfer in scattering media.In this paper,a Monte Carlo (MC) method is developed to simulate transient polarized radiative transfer in a 1D scattering medium.The directions of the beams scattering are determined by a rejection method.The transient vector radiative transfer matrix (TVRTM) is defined to describe the transient polarization behavior of short-pulse laser propagating in the scattering medium.Temporal and angular distributions of Stokes vector are obtained based on TVRTM.A time shift and superposition principle is applied to the MC model,and the computational efficiency and accuracy are improved significantly.
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