Wang Fu-juan, Li Run-hua, Wang Zi-xin, Zeng Xue-ran, Cai Zhi-gang, Zhou Jian-ying
Guang Pu Xue Yu Guang Pu Fen Xi. 2017 Jan;37(1):236-40.
A study on elemental analysis of alloy samples under low sample destruction with dual-pulse laser-ablation laser induced breakdown spectroscopy (LA-LIBS) based on one picosecond Nd : YAG laser is presented. In LA-LIBS, low pulse energy 532 nm laser was used for sample ablation and high pulse energy, time–delayed 1 064 nm laser was used for re-excitation of the ablated samples to enhance atomic emissions of the laser-induced plasma and signal detection sensitivity. The influence of pulse energies of the ablation laser and excitation laser to the signal intensities was studied experimentally. I was observed that Cu 324.75 nm line intensity in LA-LIBS was enhanced 86 times in comparison with that obtained in SP-LIBS under 10 μJ pulse energy of the ablation laser and 2.5 mJ pulse energy of the excitation laser. The diameter of the crater generated in LA-LIBS was less than 10 μm. It is demonstrated the possibility of using dual-pulse LA-LIBS to realize elemental analysis of solid sample under low sample destruction. This technique is valuable for elemental analysis of precious samples and 2D elements mapping under high spatial resolution.
钇铝石榴石激光器，采用双脉冲激光烧蚀激光诱导击穿光谱法（LA-LIBS）在低样品损耗情况下对合金样品进行元素分析的研究。在LA-LIBS中，低脉冲能量的532 nm激光用于样品烧蚀，高脉冲能量、延时的1064 nm激光用于对烧蚀后的样品进行再激发，以增强激光诱导等离子体的原子发射和信号检测灵敏度。通过实验研究了烧蚀激光和激发激光的脉冲能量对信号强度的影响。结果表明，在烧蚀激光脉冲能量为10 μJ、激发激光脉冲能量为2.5 mJ的条件下，LA-LIBS中铜324.75 nm谱线强度比单脉冲激光诱导击穿光谱法（SP-LIBS）增强了86倍。LA-LIBS产生的坑直径小于10 μm。结果证明了使用双脉冲LA-LIBS在低样品损耗情况下实现固体样品元素分析的可能性。该技术对于珍贵样品的元素分析和高空间分辨率下的二维元素映射具有重要价值。
