重复激光脉冲对熔石英损伤的演化机制  

Evolution mechanism of fused silica damage by repetitive laser pulses

作　　者：郭洪岩 刘全喜[2] GUO Hong-yan;LIU Quan-xi(College of Aeronautical Engineering,Binzhou University,Binzhou 256600,China;Southwest Institute of Technical Physics,Chengdu 610041,China)

机构地区：[1]滨州学院航空工程学院,山东滨州256600 [2]西南技术物理研究所,四川成都610041

出　　处：《激光与红外》2018年第8期958-964,共7页Laser & Infrared

基　　金：滨州学院实验技术研究项目(No.BZXYSYXM201603)资助

摘　　要：采用重复频率为10 Hz,波长为1064 nm的纳秒激光脉冲辐照熔石英元件,通过改变激光作用脉冲数,研究了不同脉冲累积效应对样品损伤形貌的影响。研究发现熔石英样品损伤主要来自于等离子冲击波作用,且损伤后,样品带隙会发生明显降低。对比激光作用样品内部和表面形貌,发现激光作用样品内部时,内部约束层使等离子冲击作用时间加长。通过对比损伤形貌的差异,可以将损伤形貌由内到外分为断裂融化区、断裂区、融化区三个部分,并通过冲击波压强变化,对各损伤区形貌成因进行了解释。The fused elements is irradiated by the nanosecond pulsed laser with the frequency of 10 Hz and the wavelength of 1064 nm,by changing the number of action laser pulses to study the influence of different pulse accumulation effects on the damage morphology of fused silica samples.It is found that the damage of the fused silica samples mainly comes from the role of the plasma shock wave,the sample bandgap will be significantly reduced after the injury.The internal confinement layer prolongs the time of the plasma impact when the internal and surface morphology of the sample are compared.By comparing the damage morphology,the damage zones from the inside to the outside can be divided into three parts：the fracture melting zone,the fracture zone and the melting zone,and the cause of the damage area is explained by the change of the shock wave pressure.

关 键 词：激光诱导损伤 热应力 激光等离子冲击波 损伤形貌 

分 类 号：TN249[电子电信—物理电子学]