KDP功能晶体表面微缺陷精密微铣削修复后存在的中高频误差严重地限制了自身的光学性能和使用寿命，课题针对微缺陷修复后的中高频误差控制及其对抗强激光损伤能力的影响问题，揭示微修复表面的刀纹形貌、宽深比、曲率变化等参数对其激光损伤的影响规律，获取微缺陷修复时允许的刀纹幅值与周期阈值范围；理论解析晶体修复表面轮廓形貌的生成机理，研究微球刀几何参数、修复工艺参数及刀具磨损等对曲面刀纹的影响规律；探究微修复系统动态特性及晶体各向异性等对加工表面中高频误差的影响规律与程度大小，开展修复表面中高频误差的抑制策略研究；综合评价微缺陷修复后的光学性能和抗强激光损伤能力，获取修复后晶体在强激光辐照下的服役性能曲线。该课题研究可为提高功能晶体元件的抗激光损伤阈值及延长其使用寿命提供理论基础，并为大口径晶体元件微缺陷修复后在核聚变装置中的实际应用提供参数依据。因此，对本课题进行深入研究有着重要的科学意义与实用价值。

The optical properties and service life of functional KDP crystal have been badly limited by the middle-high frequency errors on micro-defects repair surface by precision micro-milling .In order to suppress middle-high frequency errors on micro-defects repair surface and explore its influence on laser-induced damage resistance, this work will be carried out following four aspects.The influence law of the micro-repair surface characteristic (e.g., tool marks’ morphology,width and depth ratio,curvature change)on the laser-induced damage is to be investigated and the optimal threshold range of the amplitude and period of tool marks will be obtained. Meanwhile, the generation mechanism of the repaired surface morphology will be theoretically analyzed and the influence of machining condition (e.g.,geometric parameters of end-ball mill，repair technological parameters,the milling-tool wear) on the generation of the tool marks is to be studied. Moreover, the effect of dynamic characteristics of micro-repair system and crystalline anisotropy on the surface morphology would be discussed and the strategy to suppress the middle-high frequency errors on repair surface would also be explored. In addition, the influence of mitigation pit fabricated by micro milling on the optical properties and the ability of anti-laser damage would be evaluated comprehensively and the service performance curve of the repair crystal treated under strong laser irradiation would be obtained. This work may not only provide theoretical basis for improving both the laser transmission properties and service life of functional crystal components, but also offer parameter references for effective application of full scale crystal elements in inertial confinement fusion device. Therefore, making an in-depth study of this project has profound scientific significance and practical values.