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Effects of pulse energy ratios on plasma characteristics of dual-pulse fiber-optic laser-induced breakdown spectroscopy

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Chinese Physics B 2022年第2期31卷 387-397页

作者： Yu-Hua Hang Yan Qiu Ying Zhou Tao Liu Bin Zhu Kaixing Liao Ming-Xin Shi Fei Xue Suzhou Nuclear Power Research Institute Suzhou 215004China Key Laboratory for Physical Electronics and Devices of the Ministry of Education Faculty of Electronic and Information EngineeringXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’an 710049China

Laser-induced plasmas of dual-pulse fiber-optic laser-induced breakdown spectroscopy with different pulse energy ratios are studied by using the optical emission spectroscopy(OES)and fast *** energy of the two laser pulses is independently adjusted within 0–30 m J with the total energy fixed at 30 m *** inter-pulse delay remains 450 ns *** the energy share of the first pulse increases,a similar bimodal variation trend of line intensities is *** two peaks are obtained at the point where the first pulse is half or twice of the second one,and the maximum spectral enhancement is at the first *** bimodal variation trend is induced by the change in the dominated mechanism of dual-pulse excitation with the trough between the two peaks caused by the weak coupling between the two *** increasing the first pulse energy,there is a transition from the ablation enhancement dominance near the first peak to the plasma reheating dominance near the second *** calculations of plasma temperature and electron number density are consistent with the bimodal trend,which have the values of 17024.47 K,2.75×10^(17)cm;and 12215.93 K,1.17×10^(17)cm;at a time delay of 550 *** addition,the difference between the two peaks decreases with time *** the increase in the first pulse energy share,the plasma morphology undergoes a transformation from hemispherical to shiny-dot and to oblate-cylinder structure during the second laser irradiation from the recorded images by using an intensified charge-coupled device(ICCD)***,the peak expansion distance of the plasma front first decreases significantly from 1.99 mm in the single-pulse case to 1.34 mm at 12/18(dominated by ablation enhancement)and then increases slightly with increasing the plasma reheating *** variations in plasma dynamics verify that the change of pulse energy ratios leads to a transformation in the dual-pulse excitation mechanism.

关键词： fiber-optic laser-induced breakdown spectroscopy(FO-LIBS) dual-pulse excitation pulse energy ratio spectral enhancement

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