激光在海洋型气溶胶中传输的蒙特卡罗模拟

MONTE CARLO SIMULATION OF LASER TRANSMISSION IN MARINE AEROSOLS

激光在海洋大气中传输时,由于海洋型气溶胶的散射和吸收,激光能量会不断衰减,影响激光系统的作用效能。基于蒙特卡罗方法,研究了传播距离、能见度和激光束初始均方根半径对到达接收平面处光子空间分布的影响。研究表明,随着传播距离的增加,到达接收平面光子数呈近似线性减少的趋势;随着能见度的增加,到达接收平面光子数一开始迅速增加,然后趋于稳定;随着激光束初始均方根半径的增加,到达接收平面光子数一开始变化不大,然后缓慢减少。此外,在上述几种情形下,均未发现光子空间分布对高斯分布的偏离。研究结果可为分析海洋大气环境对激光器作用效能的影响提供理论依据。

When the laser is transported in the oceanic atmosphere,the laser energy is attenuated due to the scattering and absorption of the marine aerosols,which affects the effectiveness of the laser system.Based on the Monte Carlo method,the influence of propagation distance,visibility and laser initial root mean square radius on the photon spatial distribution at the receiving plane is studied.The results show that,as the propagation distance increases,the number of photons arriving at the receiving plane is approximately linearly decreasing;as the visibility increases,the number of photons arriving at the receiving plane begins to increase rapidly and then stabilize;as the initial root mean square radius increases,the number of photons arriving at the receiving plane does not change at first,and then decreases slowly.In addition,in the above cases,no deviation of the photon spatial distribution to the Gaussian distribution is found.The research results can provide a theoretical basis for analyzing the effects of the marine atmospheric environment on the laser performance.