Influence of secondary treatment with CO_2 laser irradiation for mitigation site on fused silica surface

作     者：蒋勇 周强 邱荣 高翔 王慧丽 姚彩珍 王俊波 赵鑫 刘春明 向霞 祖小涛 袁晓东 苗心向 

作者机构：Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and Technology School of Physical Electronics University of Electronic Science and Technology of China Research Center of Laser Fusion China Academy of Engineering Physics 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2016年第25卷第10期

页      面：475-481页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0803[工学-光学工程] 0704[理学-天文学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.61505170,61505171,and 51535003) the Joint Fund of the National Natural Science Foundation of China the Chinese Academy of Engineering Physics(Grant No.U1530109) the China Postdoctoral Science Foundation(Grant No.2016M592709) 

主　　题：fused silica CO_2 laser numerical simulation secondary treatment 

摘      要：The ablation debris and raised rim, as well as residual stress and deep crater will be formed during the mitigation of damage site with a CO2 laser irradiation on fused silica surface, which greatly affects the laser damage resistance of optics. In this study, the experimental study combined with numerical simulation is utilized to investigate the effect of the secondary treatment on a mitigated site by CO2laser irradiation. The results indicate that the ablation debris and the raised rim can be completely eliminated and the depth of crater can be reduced. Notable results show that the residual stress of the mitigation site after treatment will reduce two-thirds of the original stress. Finally, the elimination and the controlling mechanism of secondary treatment on the debris and raised rim, as well as the reasons for changing the profile and stress are analyzed. The results can provide a reference for the optimization treatment of mitigation sites by CO2laser secondary treatment.