二维光束整形的衍射光学元件设计

Two-dimensional Beam Shaping with Diffractive Optical Elements

采用加权串行迭代算法(WSI)设计衍射光学元件(DOE),将二维圆形高斯分布的激光光束分别整形为二维正方形和三角形的均匀光束,同时实现了光束形状改变及振幅分布均匀化的功能。模拟计算结果表明,用WSI设计得到的输出波形形状基本达到要求,转换到均匀区的能量效率分别达到95.3％、93.6％。

Diffractive optical elements are designed to implement the wavefront transformation from a two-dimensional circular-Gaussian beam to a two-dimensional flat-top square beam and a two-dimensional flat-top triangular beam respectively with the weighted serial iterative (WSI) algorithm, which realizes the transformation of beam-shape and the uniform distribution of the amplitude. The computed results indicate that the energy transformation efficiency is up to 95.3%, 93.6%, arid the output amplitude satisfies the need.