KDP功能晶体表面微缺陷的修复机制及其对抗强激光损伤能力的影响研究

项目名称： KDP功能晶体表面微缺陷的修复机制及其对抗强激光损伤能力的影响研究

项目编号： No.51275113

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 机械、仪表工业

项目作者： 陈明君

作者单位： 哈尔滨工业大学

项目金额： 80万元

中文摘要： KDP功能晶体表面的激光损伤微缺陷严重限制了自身的光学传输特性及其使用寿命，课题针对该晶体表面微缺陷的修复机制及其对抗激光损伤能力的影响问题，深入研究晶体表面微缺陷的形状特征、直径尺寸、缺陷深度等参数对其激光损伤的影响规律；理论揭示微缺陷微铣削修复过程中材料的去除机理，获取可实现微缺陷表面超光滑修复的脆塑转变临界条件；探索材料各向异性等机械特性对微缺陷修复质量的影响程度大小，研究微修复时金刚石球刀几何参数、切削工艺等对超光滑表面形成的影响规律；探讨晶体修复后其表面形貌特征与激光损伤阈值的映射机制，对微缺陷修复后晶体的光学性能与抗损伤能力等进行综合评价，给出其修复后晶体表面对抗强激光损伤能力的寿命预测曲线。课题的研究可为提升功能晶体元件的激光传输特性及其使用寿命提供理论基础，并为大口径晶体元件在工程应用过程中的有效修复提供参数依据。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。

中文关键词： KDP功能晶体；微缺陷；精密微修复；激光诱导损伤；抗损伤能力

英文摘要： The optical transmission properties and service life of functional KDP crystal have been badly limited by the laser induced surface micro-defects. Aiming at the issues of mechanism for repairing these micro-defects and its influence on laser-induced damage resistance, this work will be carried out following four aspects. The influence law of the micro-defects characteristic parameters (e.g., morphology, diameter size, and defect depth) on high power laser induced damage is to be intensively studied. Meanwhile, the removal mechanism of defective material will be theoretically analyzed and the critical conditions of brittle-ductile transition for the acquirement of repaired super-smooth surface during repair process by precision micro-milling are also to be obtained. Moreover, the influence regulations of geometric parameters of diamond ball end mill and cutting parameters on the formation of super-smooth surface would be discussed and the effect of mechanical properties such as crystalline anisotropy on the repair quality would be also explored. In addition, the mapping relationship between the repaired topography characteristics and laser-induced damage threshold of KDP crystal will be investigated and the predicted life curve of repaired KDP crystal will be achieved after comprehensive evaluation of the optical

英文关键词： Functional KDP Crystal；Micro-defects；Precision Micro-repairing；Laser-induced Damage；Damage Resistance