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Efficient method for evaluation of the diffraction efficiency upper bound of diffractive phase elements

机译:评估衍射相元素衍射效率上限的有效方法

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摘要

The theoretical diffraction efficiency upper limit of diffractive phase elements (DPE's) with finite apertures is investigated. A successful numerical method of evaluating the efficiency upper bound of DPE's is proposed. The method includes a hybrid optimization procedure that combines a genetic algorithm with the conjugate gradient method. This efficient global optimization technique can also be used to design DPE's. Simulation computations are detailed for rotationally symmetric beam shaping in which a Gaussian profile laser beam is converted into a uniform beam. Numerical results demonstrate that the estimated diffraction efficiency upper bound is consistent with the design results.
机译:研究了具有有限孔径的衍射相元素(DPE)的理论衍射效率上限。提出了一种评估DPE效率上限的成功数值方法。该方法包括将遗传算法与共轭梯度法相结合的混合优化程序。这种高效的全局优化技术还可用于设计DPE。详细介绍了旋转对称光束成形的模拟计算,其中将高斯轮廓激光束转换为均匀光束。数值结果表明,估计的衍射效率上限与设计结果一致。

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