不同空间分布光束通过聚焦光学系统传输特性的比较

基于柯林斯公式和ABCD传输矩阵理论，在相同激光功率和初始束宽下，研究了不同空间分布光束通过聚焦光学系统的传输特性，结果表明，入口处不同阶次的超高斯光束在距离光学系统焦点一半的位置（z=f/2)，光强分布的差别很大，轴上光强随着阶次的增加，先增加，然后减小至固定值；聚焦光学系统入口处超高斯光束的阶次越大，即光强分布越均匀，在光学系统的焦点位置（z=f)，光轴上激光强度越大，直至趋于固定值，但光强分布的差别不大。

Propagation of laser beam with different profiles through an aperture lens

Based on Collins formula and ABCD propagation matrix theory,the propagations of laser beams with different profiles through an aperture lens are analyzed and compared under the same laser beam power and initial beam width in this paper.Super-Gaussian beams with different beam orders are used as examples of different beam profiles.Results show that at the plane of half focal length(z=f/2) after aperture lens,intensity distributions are obviously different for different initial beam profiles;at the focal plane (z=f)of aperture lens,intensity distributions have a little difference for different initial beam profiles.Intensity at beam axis changing with different initial beam profile is also discussed and compared.