| 光谱学与光谱分析 |
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| Elemental Analysis of Alloys with Picosecond Dual-Pulse LA-LIBS under Low Sample Destruction |
| WANG Fu-juan1, LI Run-hua2*, WANG Zi-xin1, ZENG Xue-ran1, CAI Zhi-gang1, ZHOU Jian-ying1 |
| 1. State Key Laboratory of Optoelectronic Materials and Technology, Sun Yat-sen University, Guangzhou 510275, China2. School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510641, China |
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Abstract 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.
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Received: 2015-12-14
Accepted: 2016-04-21
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Corresponding Authors:
LI Run-hua
E-mail: rhli@scut.edu.cn
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