衍折射光学元件用于多模光束的聚焦

Multimode Gaussian beams focusing with a diffractive-refractive optical element

设计了一种衍折射光学元件用于多模光束的整形和聚焦。元件的内环部分由衍射光学元件组成以对高斯基模整形，外环部分由折射透镜组成以对高阶模部分进行聚焦。用此元件在预定输出平面获得了较小聚焦光斑的结果。

A diffractive refractive optical element used for multimode laser beams is designed to achieve a tiny focused speckle on the predefined output plane. The inner diffractive part of the element is used for TEM 00 beam-shaping, with its outer refractive part used for higher order Gaussian beams' focusing.