基于全内反射的无金属偏振滤波器高效光栅设计应用于混合优化程序

Chabum Lee
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引用次数: 0

摘要

本文提出了一种基于两步混合优化技术的基于光栅的无金属偏振滤波器的快速、严格的设计方法。利用层状全内反射的光栅结构实现了无金属溶液,这是高功率激光啁啾脉冲放大系统的关键技术。本文设计了极化敏感型和极化不敏感型两种偏振滤波器。基于光栅偏振滤波器的衍射特性对设计参数的微小变化高度敏感,采用两步混合优化方法对光栅结构、节距、深度和填充系数的设计参数进行了优化。将田口法引入到遗传算法的选择过程中,表明田口法先对设计参数进行粗优化,然后再利用遗传算法对粗优化后的参数进行细优化。因此,该方法可以解决具有连续变量的全局数值优化问题。所提出的两步混合优化算法可以有效地优化光栅结构以实现偏振滤波应用,优化后的光栅结构对入射光的TE或TM波选择性滤除率高达99.8%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Total Internal Reflection-Based High Efficiency Grating Design for a Metal-Free Polarizing Filter Applications Using Hybrid Optimization Procedure
This paper presents a fast and rigorous design method for grating-based metal-free polarizing filter applications using two-step hybrid optimization techniques. Grating structures utilizing the total internal reflection in a lamellar configuration were used to achieve metal-free solution, which is a key technology in the chirped pulse amplification for high power laser system. Here two polarizing filters were designed: polarization sensitive and polarization insensitive. Those polarization performances were characterized by the rigorous coupled-wave analysis (RCWA), and the design parameters of grating structures, pitch, depth, and filling factor were optimized by two-step hybrid optimization procedure because the diffraction characteristics of grating-based polarizing filters are highly sensitive to small changes in design parameters. The Taguchi method is incorporated into selection process in the genetic algorithm, which indicates that the Taguchi method optimizes the design parameters in a coarse manner, and then, coarsely optimized parameters are finely optimized using the genetic algorithm. Therefore the proposed method could solve global numerical optimization problems with continuous variables. The proposed two-step hybrid optimization algorithm could effectively optimize the grating structures for the purpose of polarization filter applications, and the optimized grating structures could selectively filter the incident light up to 99.8% as to TE or TM waves.
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