激光等离子体对BK7玻璃的损伤的特征研究  

Study on properties of damage to BK7 glass caused by laser plasma

作　　者：周继芳[1,2] 李海波[3] 温海舒[3] 傅玉青[2] 包凌东[2] 杨李茗[3] 陈建国[2] 

机构地区：[1]成都医学院人文信息管理学院物理教研室。四川成都610081 [2]四川大学电子信息学院,四川成都610064 [3]成都精密光学工程研究中心,四川成都610041

出　　处：《激光杂志》2011年第2期39-40,共2页Laser Journal

基　　金：国家自然科学基金重大项目(基金号:60890203);国家自然科学基金委员会--中国工程物理研究院联合基金(基金号:10676023);四川大学青年教师科研启动基金(基金号:2009SCU11008)

摘　　要：实验研究了ns激光脉冲聚焦到BK7玻璃表面发生电离时玻璃的损伤形貌,并基于激光等离子体的特性对损伤特征进行了分析。研究发现:激光击穿产生的激光等离子体具有高温高压的特性以及较宽的光谱分布,这些特性对脆性BK7玻璃的损伤特性有决定性的影响。激光等离子体发射光谱的波长分布远远小于入射激光的波长,其电离效应大大增强,使玻璃材料更易发生击穿;等离子体的高温特性会对脆性玻璃进行熔蚀;冲击波作用使损伤中心处发生充分断裂,并绕中心产生环状的破坏;发生环形断裂的同时,张力作用会使得玻璃产生沿着径向的裂纹,其间折射率发生明显的变化。In the experiment,topography damage was investigated during ionization when ns laser pulse focused on the surface of BK7 glass,and the properties of damage was analyzed based on the characteristics of laser plasmas.Study shows that laser plasma caused by laser breakdown has a property of high temperature and high pressure as well as a relatively wide spectral distribution which play a dominant role in the damage to brittle BK7 glass： wavelength distribution of laser plasma emission spectrum is far less than laser wavelength of incidence,so that its ionization effects are greatly strengthened and it produces breakdown of vitreous material more easily;high temperature property of laser plasma causes corrosion to brittle glass;shock wave makes full fracture occur in the center of the damage,and causes circular destruction around the center;in the meantime,tension brings radial cracks to the glass,and its refractive index changes a lot.

关 键 词：激光诱导损伤 激光等离子体 冲击波 电离效应 

分 类 号：TN248.1[电子电信—物理电子学]