【作者】 温圣林； 侯晶； 杨春林； 颜浩； 石琦凯； 周礼书；

【Author】 Wen Sheng-lin,Hou Jing,Yang Chun-lin,Yan Hao,Shi Qikai,Zhou Lishu (Chengdu Fine Optical Engineering Research Center,Chengdu,610041)

【机构】 成都精密光学工程研究中心；

【摘要】 连续相位板是大型激光装置中用于控制光束形状、能量和波前分布的一种重要衍射光学元件。为改善聚焦光束的质量,建立了基于现有工艺的大口径连续相位板理论设计模型,优化了传统衍射元件设计算法。采用该算法设计了用于背光照明的Ф330mm CPP,开展了数控化学抛光制作CPP试制,并在大型激光装置上开展了验证实验。结果表明,基于工艺改进算法设计的CPP具有更好的加工特性和焦斑性能,基本实现了整形和匀滑性能,能够较好满足现有工艺约束条件和物理需求。更多还原

【Abstract】 Continuous phase plates (CPP) are important diffractive elements for precise control of beam-shape,energy distribution and wavefront profile in the large laser assembly.A theoretical design model for continuous phase plates (CPP) used in inertial confinement fusion is built to improve the focus beam quality and reduce the difficulty of CPP’s fabrication.Moreover,the traditional G-S algorithm is modified through choosing continuous initial phase,phase unwrapping,phase filtering and controlling the frequency spectrum of focal spot.The operational characteristic and the focal spot’s performance caused by the CPP designed by traditional G-S algorithm and modified G-S algorithm are analyzed comparatively.The CPP with 330 millimeters of diameters used for back lighting is designed and first fabricated using numerical control wet-etching,.It shows that the CPP designed by the modified method meets the process restriction and physical specifications very well.更多还原