红外与激光工程, 2016, 45 (12): 1206013, 网络出版: 2017-01-12   

高反Al2O3/SiO2膜内超快激光预损伤动力学过程

Ultrafast laser pre-damage dynamics process in Al2O3/SiO2 high reflectors
作者单位
1 中国科学院上海光学精密机械研究所 强场激光物理国家重点实验室, 上海 201800
2 中国科学院大学, 北京 100049
3 中国科学院上海光学精密机械研究所 强激光材料重点实验室, 上海 201800
4 日本电气通信大学 先端超高速激光研究中心, 日本 东京 182-8585
摘要
利用紫外飞秒激光光谱技术研究了Al2O3/SiO2高反射膜内的超快载流子动力学。通过实验, 发现该反射膜Al2O3层的载流子动力学在紫外反射膜的激光诱导损伤中起着至关重要的作用。通过泵浦-探测实验, 发现紫外飞秒激光与光学薄膜作用后, 光学薄膜反射率有所下降, 且探测光反射率变化的峰值在约2.3 ps的时间内从417 nm左右转移到402 nm左右。为了更好的解释激光诱导载流子动力学, 一个具体的理论模型被提出来, 该模型指出导带自由电子弛豫过程中与晶格相互作用, 产生距导带一个光子能量的中间缺陷态, 其初始电子密度影响了材料损伤阈值高低。通过该理论模型得出的激光损伤阈值数据和实验数据吻合得很好。
Abstract
Ultrafast carrier dynamics in Al2O3/SiO2 high reflectors was investigated by UV femtosecond laser. It was identified by laser spectroscopy that, the carrier dynamics contributed from the front few layers of Al2O3 played a dominating role in the initial laser-induced damage of the UV reflector. Time-resolved reflection decrease after the UV excitation was observed by pump-probe experiment, and the peak value of the variation of the reflectivity of the probe light changed from 417 nm to 402 nm in 2.3 ps. To interpret the laser induced carrier dynamics further, a specific theoretical model including multiphoton ionization(MPI), avalanche ionization(AI), and the mid-gap defect state was built to simulate the evolution process of the electron density in the conduction band, it pointed out that during the conduction band free electron relaxation process, the mid-gap defect state locating about one photon below the conduction band was formed because of the interaction between electrons and lattice. The initial electron density effect of the mid-gap defect state has important influence to the damage threshold of the Al2O3/SiO2 high reflectors. This model agrees very well with the experimental results.

袁伟, 邢昕, 韩冬佳, 李泽汉, 薛冰, 小林孝嘉, 杜鹃, 赵元安, 冷雨欣, 邵建达. 高反Al2O3/SiO2膜内超快激光预损伤动力学过程[J]. 红外与激光工程, 2016, 45(12): 1206013. Yuan Wei, Xing Xin, Han Dongjia, Li Zehan, Xue Bing, Kobayashi Takayoshi, Du Juan, Zhao Yuanan, Leng Yuxin, Shao Jianda. Ultrafast laser pre-damage dynamics process in Al2O3/SiO2 high reflectors[J]. Infrared and Laser Engineering, 2016, 45(12): 1206013.

本文已被 2 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!