高斯和平顶分布纳秒激光诱导KTP晶体损伤  

Laser-induced Damage of KTP Crystal Using Nanosecond Lasers with Flat-top and Gaussian Spatial Distributions

作　　者：张思楠 白芳 麻云凤 杨学博 殷晨轩 程旺 周家玮 曹灿 郭广妍 赵鹏 樊仲维 ZHANG Sinan;BAI Fang;MA Yunfeng;YANG Xuebo;YIN Chenxuan;CHENG Wang;ZHOU Jiawei;CAO Can;GUO Guangyan;ZHAO Peng;FAN Zhongwei(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,CHN;School of Optoelectronics,University of Chinese Academy of Sciences,Beijing 100049,CHN;School of Optoelectronics,China Jiliang University,Zhejiang 310018,CHN)

机构地区：[1]中国科学院空天信息创新研究院,北京100094 [2]中国科学院大学光电学院,北京100049 [3]中国计量大学光电学院,杭州310018

出　　处：《半导体光电》2022年第5期903-908,共6页Semiconductor Optoelectronics

基　　金：中国科学院青年创新促进会项目(2017195)。

摘　　要：KTP晶体的抗激光损伤能力影响了其在高端固体激光系统中的应用。利用波长为1.064μm、重频为10 Hz、脉宽为10 ns和两种空间分布的光束(即高斯光束和平顶光束)的激光对KTP晶体进行了激光诱导损伤的仿真和实验。结果表明,在平顶激光和高斯激光的损伤测试中,KTP晶体的激光诱导损伤阈值分别为1.78和2.28 GW/cm^(2)。平顶激光辐照KTP晶体,损伤形貌为明显的烧蚀形态和裂纹,而高斯激光辐照KTP晶体时,前表面出现了典型的纳秒激光损伤形态,即熔融形成的凹坑。此外,在平顶激光测试下,观察到损伤区域边缘颜色变化。The laser damage resistance of KTP crystal affects its application in the high-end solid-state laser systems. This study performed the simulation and actual experiments of laser-induced damage of KTP crystal using the laser with a wavelength of 1.064 μm, a heavy frequency of 10 Hz, a pulse width of 10 ns and two spatially distributed beams, i.e., Gaussian beam and flat-top beam. Results indicate that the laser-induced damage thresholds of KTP crystals are 1.78 and 2.28 GW/cm^(2) respectively for the flat-top beam and Gaussian beam. The laser-induced damage experiments show that the flat-top beam causes obvious ablation morphology and cracks in the KTP crystal while the Gaussian beam causes typical nanosecond laser damage on the front of surface: pits caused by melting. In addition, the color changes in the edge of the damage region can be observed in case of flat-top beam.

关 键 词：KTP晶体 激光诱导损伤 平顶光束 高斯光束 

分 类 号：TN249[电子电信—物理电子学]