用激光诱导击穿光谱测量铝合金的激光烧蚀阈值  

Determination of laser-ablation threshold of aluminum alloy with laser-induced breakdown spectroscopy

作　　者：杨雪娇[1] 彭飞飞[1] 李润华[1] 

机构地区：[1]华南理工大学理学院物理系,广州510641

出　　处：《强激光与粒子束》2013年第3期557-560,共4页High Power Laser and Particle Beams

基　　金：国家重大科学研究计划项目(2012CB921900);中央高校科研业务费专项资金项目(x2lx-D2116740);国家自然科学基金项目(10874047)

摘　　要：采用正交几何配置的双波长双脉冲激光烧蚀-激光诱导击穿光谱技术准确测量了铝合金样品的激光烧蚀阈值。在烧蚀激光波长为532nm、脉宽为12ns并采用焦距为2cm的非球面透镜强聚焦的条件下,得到铝合金的激光能量烧蚀阈值为48μJ,等效的能量密度烧蚀阈值为9.8J/cm2。该技术是一种新的激光烧蚀阈值的光谱测量手段,与传统的测量技术相比,具有高灵敏、准确、快捷和便利的特点,可以用于不同材料的激光烧蚀阈值的准确测量。The la.ser-ablation threshold of aluminum alloy was accurately measured by dual-wavelength dual-pulse laser-abla- tion laser-induced breakdown spectroscopy under orthogonal geometric arrangement. For 532 nm laser wavelength and 12 ns laser pulse width, the laser ablation energy threshold of aluminum alloy was determined to be 48 μJ, equivalent with a fluence threshold of 9.8 J/cm^2 , under tightly focused condition with an aspheric lens of 2 cm focal length. This is a new spectroscopic method to measure laser-ablation threshold. It is more sensitive and more accurate in comparison with established methods for laser-ablation threshold measurement, and the measurement is rapid and quite convenient. This method can be used for accurate laser-ablation threshold measurement for different materials.

关 键 词：激光诱导击穿光谱 激光烧蚀阈值 阈值测量 

分 类 号：O433.4[机械工程—光学工程]