高功率激光束在空间滤波器中的传输特性

Numerical Study on Transformation Property of High Power Laser Beam Propagating Through Spatial Filter

利用数值方法研究了高功率激光束通过空间滤波器形成低频调制的规律。结果表明 ,空间滤波器引起光束填充因子的下降与空间滤波器的衍射极限倍数 m之间存在敏感的关系。m值的微小调整可以极大地改善整个光束的填充因子 ,减少光束的调制对比度 ,从而改善光束质量。

The transformation property of high power laser beam in spatial filter is investigated by numerical simulation. It is shown that the fill factor or intensity modulation contrast of modulation ring due to the diffraction is related to the parameters of spatial filter, which could be calibrated in terms of the times of diffraction limitation of the filter pinhole.