激光扩束系统衍射现象数值计算

Numerical calculation of diffraction for laser expanding system

本文在标量衍射理论的基础上 ,应用柯林斯公式数值计算了高斯光束经过通光口径较小的扩束光学系统后的光强分布 ,结果表明出射激光光束的束散角虽然可以压缩 ,但往往不是高斯光束 ,而是具有亮暗相间的多个环状光束。

In this paper, on basis of the theory of scalar diffraction, Collins equation is used to numerically calculate laser intensity distribution after Gaussian laser beam passes beam expanding telescope system with small aperture. Though the beam divergence angle can be reduce, the results show that output light distribution is not Gaussian beam, however with many bright and dark diffraction rings. This kind of analysis is helpful for design of the beam expanding system and other optical systems.