摘要
利用SAGA激光器,输出脉宽为7.2ns、波长分别为1064nm、532nm、355nm的基频光和倍频光,对相同类型的5块石英基片用R∶1的方法分别测量了其损伤阈值,对比不同波长激光对石英材料的损伤行为差异。得出其损伤阈值在三种不同波长激光作用下分别为:46.78J/cm2、13.4J/cm2、9.28J/cm2;并利用尼康E600W光学显微镜对三种不同波长激光造成的损伤形貌进行了观察,结合当前光学材料的损伤机理,对比得出倍频激光对石英基片的损伤破坏能力远大于基频光,且对石英材料的损伤机理主要表现为多光子吸收导致的雪崩电离破坏,而基频光的损伤多为表面缺陷及杂质引起的热破坏的结论。
In order to study damage action of fused silica with different wavelength laser, the laser of fundamental frequency and double frequency with the wavelength of 1 064 nm, 532 nm and 355 nm are used and the pulse-width is 7. 2 nm. The damage-thresholds of 5 pieces of fused silica are measured by using the method of R ： 1. The damage-thresholds of different wavelength laser are 46. 78 J/cm2, 13. 4 J/cm2 and 9.28 J/cm2 respectivly. The damage images of different wavelength laser are observed with Nikon E600 optic-microscope. The results prove that the damage power of double frequency laser is more than that of fundamental frequency laser. The damage mechanism of double frequency laser is avalanche-ionization breakdown. The damage mechanism of fundumental frequency laser is thermal damage caused by the defect and impurity of the surface.
出处
《光学与光电技术》
2007年第6期5-8,共4页
Optics & Optoelectronic Technology
基金
国家高技术研究发展计划专项经费(2006AA8048040)资助项目
关键词
激光技术
损伤阂值
表面缺陷
雪崩电离
石英基片
laser technique
damage-threshold, surface defect
avalanche ionization breakdown
fused silica
