激光诱导熔石英表面损伤修复中的气泡形成和控制研究  

Formation and control of bubbles during the mitigation of laser-induced damage on fused silica surface

作　　者：张丽娟[1] 张传超[1] 陈静[1] 白阳[1] 蒋一岚[1] 蒋晓龙[1] 王海军[1] 栾晓雨[1] 袁晓东[1] 廖威[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,绵阳621900

出　　处：《物理学报》2018年第1期216-222,共7页Acta Physica Sinica

基　　金：国家自然科学基金青年科学基金(批准号:11404301;61505185)资助的课题~~

摘　　要：基于熔石英材料在CO_2激光作用下的温度分布和结构参数变化的计算结果,对熔石英损伤修复中的气泡形成和控制进行了研究.针对损伤尺寸介于150—250μm之间的损伤点,提出了一种能够有效控制气泡形成的长时间低温预热修复方法.基于低温下熔石英材料结构弛豫时间常数较长的特点,该方法在不引起熔石英材料结构发生显著变化的同时,能够解吸附表面和裂纹处所附着的气体和杂质,可有效降低裂纹闭合过程中气泡形成的概率.实验结果表明,长时间低温预热修复方法的成功修复概率可达到98%.Surface damage on fused silica optics initiated by high fluence 351 nm laser is one of the major bottlenecks for the high power laser systems, such as, Shenguang Ⅲ（SG-Ⅲ） laser facility. Generally, the CO2 laser, which is strongly absorbed by fused silica and thus can effectively heat fused silica above melting temperature, is used to locally mitigate the damages, called the non-evaporative mitigation method. However, subsurface bubbles may be introduced in the damage mitigation process by CO2 laser melting. Unfortunately, the mitigated damage sites with subsurface bubbles can be easily re-initiated upon subsequent laser shots. In this article, in order to eliminate the subsurface bubbles,we systematically investigate the influences of mitigation protocols in different ways of laser irradiation preheating on the formation and control of subsurface bubbles. Based on the simulated results of the temperature distribution and structural changes under CO2 laser irradiation, two CO2 laser-based non-evaporative mitigation methods are proposed,which are adopted for the mitigation of surface damage sites ranging in size from 150 μm to 250 μm, and systematically investigated to assess the effect of eliminating subsurface bubbles. The process of mitigation method Ⅰ is that multiple laser irradiations with short time and increasing power are initially used to preheat the damage site and then a higher power laser irradiation is adopted to mitigate the damage site. The process of mitigation method Ⅱ is that a long time, low power laser irradiation is first used to preheat the damage site and then a high power laser irradiation is adopted to mitigate the damage site. The detailed morphologies of the mitigation sites and subsurface bubbles produced by the two mitigation methods are measured by optical microscope with high magnification. A large number of small subsurface bubbles are observed in mitigation method Ⅰ. While, less subsurface bubbles are observed in mitigation method Ⅱ. The statistical results indica

关 键 词：熔石英 CO2激光修复 气泡 激光损伤 

分 类 号：TN249[电子电信—物理电子学]