Sensitive trace element analysis of alloys using multipass cell enhanced laser-induced breakdown spectroscopy
BAI Yu1,2, WANG Shu-qing3, ZHANG Lei*1,2, YIN Wang-bao*1,2, XIAO Lian-tuan1,2, JIA Suo-tang1,2
1. Institute of Laser Spectroscopy, State Key Laboratory of Quantum Optics and Quantum Optics Devices,Shanxi University, Taiyuan 030006, China; 2. Collaborative Innovation Center of Extreme Optics, Shanxi University,Taiyuan 030006, China; 3. Research Institute of Petroleum Processing, Sinopec, Beijing 100083, China
Abstract：Laser-induced breakdown spectroscopy (LIBS) has great potential in surface trace element analysis of alloys. Although LIBS, even double-pulse LIBS (DP-LIBS) has greatly improved the sensitivity, its limit of detection (LOD) is not sufficient for some applications. To further improve the sensitivity of DP-LIBS, concentric multipass cell (CMC) enhanced DP-LIBS (CMC-DP-LIBS) technique was proposed, which using CMC to reflect and refocus the reheating laser pulse, heating the plasma continuously. The energy of reheating laser was fully used in this way, thus improving the spectral signal and sensitivity. The results based on the detection of Mn on the surface of Zn samples showed that CMC-DP-LIBS lowered the LOD of Mn by 63% compared with orthogonal reheating DP-LIBS, which indicated that CMC-DP-LIBS indeed greatly improved the sensitivity of LIBS, and was able to expand more application in surface trace element analysis of alloys, especially for the field where the ablating and damage of the samples were restricted.
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