用激光诱导击穿光谱测量铝合金的激光烧蚀阈值

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532 nm、脉宽为12 ns并采用焦距为2 cm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9.8 J/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 laser-ablation threshold of aluminum alloy was accurately measured by dual-wavelength dual-pulse laser-ablation 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/cm2 , 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.