| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Effects of pulse energy ratios on plasma characteristics of dual-pulse fiber-optic laser-induced breakdown spectroscopy |
| Yu-Hua Hang(杭玉桦)1, Yan Qiu(邱岩)2,3,†, Ying Zhou(周颖)3, Tao Liu(刘韬)1, Bin Zhu(朱斌)1, Kaixing Liao(廖开星)1, Ming-Xin Shi(时铭鑫)3, and Fei Xue(薛飞)1 |
1 Suzhou Nuclear Power Research Institute, Suzhou 215004, China;
2 Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Faculty of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China;
3 State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China |
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Abstract 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 imaging. The energy of the two laser pulses is independently adjusted within 0-30 mJ with the total energy fixed at 30 mJ. The inter-pulse delay remains 450 ns constantly. As the energy share of the first pulse increases, a similar bimodal variation trend of line intensities is observed. The 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 peak. The 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 mechanisms. By 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 peak. The calculations of plasma temperature and electron number density are consistent with the bimodal trend, which have the values of 17024.47 K, 2.75×1017 cm-3 and 12215.93 K, 1.17×1017 cm-3 at a time delay of 550 ns. In addition, the difference between the two peaks decreases with time delay. With 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) camera. Correspondingly, 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 effect. The variations in plasma dynamics verify that the change of pulse energy ratios leads to a transformation in the dual-pulse excitation mechanism.
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Received: 06 May 2021
Revised: 16 August 2021
Accepted manuscript online: 22 August 2021
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PACS:
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42.81.-i
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(Fiber optics)
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42.60.By
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(Design of specific laser systems)
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42.60.-v
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(Laser optical systems: design and operation)
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42.25.Bs
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(Wave propagation, transmission and absorption)
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| Fund: The authors are grateful for the Foundation Research Project of Jiangsu Province, China (the Natural Science Fund No. BK20190187). |
Corresponding Authors:
Yan Qiu
E-mail: yanq_xjtu@stu.xjtu.edu.cn
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Cite this article:
Yu-Hua Hang(杭玉桦), Yan Qiu(邱岩), Ying Zhou(周颖), Tao Liu(刘韬), Bin Zhu(朱斌), Kaixing Liao(廖开星), Ming-Xin Shi(时铭鑫), and Fei Xue(薛飞) Effects of pulse energy ratios on plasma characteristics of dual-pulse fiber-optic laser-induced breakdown spectroscopy 2022 Chin. Phys. B 31 024212
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