KrF激光和脉冲CO2激光损伤K9玻璃的实验对比与分析

对KrF准分子激光辐照K9玻璃进行了损伤实验，并与脉冲CO2激光损伤K9玻璃进行了对比分析，研究了紫外和远红外两种激光系统对同种光学材料的损伤特性。实验结果结果表明，KrF准分子激光和脉冲CO2激光对K9玻璃的损伤形貌基本相同，损伤主要是热力耦合损伤机制，但是两者在损伤阈值和损伤时间等方面仍有很大差别。与脉冲CO2激光相比，K9玻璃的KrF准分子激光损伤阈值更低，并且损伤持续时间更短。通过两类激光在波长和光子能量上的巨大差异可以很好地解释这一现象。该研究结果对准分子激光在空间工程应用上有着非常重要的参考价值。

Experimental comparison and analysis on damage performance of K9 glass irradiated by KrF excimer laser and pulse CO2 laser

It has very important application value to investigate the damage performance of K9 glass irradiated by ultraviolet excimer laser. In this paper, the experiment research on damage in K9 glass irradiated by 248 nm KrF excimer laser was carried out, the sample damage threshold and damage morphology were analyzed by means of metallurgical microscope and scanning electron microscope. The comparison of laser induced damage performance between KrF excimer laser and pulse CO2 laser were investigated. The experimental results indicate that the damage mechanism of K9 glass irradiated by KrF excimer laser and pulse CO2 laser mainly follow the thermal-mechanical coupling mechanism. However, there is apparent difference in damage threshold and damage time. For example, the damage threshold is lower and the damage time is shorter for KrF excimer laser. This can be explained by the difference in wavelength and photon energy between the KrF excimer laser and pulse CO2 laser. The research presented in this paper is helpful for further exploring the ultraviolet excimer laser damage mechanism of optical materials.