Emission Characteristics of Laser-Induced Plasma Using Collinear Long and Short Dual-Pulse Laser-Induced Breakdown Spectroscopy (LIBS)

Zhenzhen Wang; Yoshihiro Deguchi; Renwei Liu; Akihiro Ikutomo; Zhenzhen Zhang; Daotong Chong; Junjie Yan; Jiping Liu; Fang-Jung Shiou

doi:10.1177/0003702817693239

Emission Characteristics of Laser-Induced Plasma Using Collinear Long and Short Dual-Pulse Laser-Induced Breakdown Spectroscopy (LIBS)

Appl Spectrosc. 2017 Sep;71(9):2187-2198. doi: 10.1177/0003702817693239. Epub 2017 Apr 18.

Authors

Zhenzhen Wang^{1

2}, Yoshihiro Deguchi², Renwei Liu^{2

3}, Akihiro Ikutomo², Zhenzhen Zhang³, Daotong Chong¹, Junjie Yan¹, Jiping Liu³, Fang-Jung Shiou⁴

Affiliations

¹ 1 State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, China.
² 2 Graduate School of Advanced Technology and Science, Tokushima University, Tokushima, Japan.
³ 3 Moe Key Laboratory of Thermo-Fluid Science and Engineering, Xi'an Jiaotong University, Xi'an, China.
⁴ 4 Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan.

PMID: 28418264
DOI: 10.1177/0003702817693239

Abstract

Collinear long and short dual-pulse laser-induced breakdown spectroscopy (DP-LIBS) was employed to clarify the emission characteristics from laser-induced plasma. The plasma was sustained and became stable by the long pulse-width laser with the pulse width of 60 μs under free running (FR) conditions as an external energy source. Comparing the measurement results of stainless steel in air using single-pulse LIBS (SP-LIBS) and DP-LIBS, the emission intensity was markedly enhanced using DP-LIBS. The temperature of plasma induced by DP-LIBS was maintained at a higher temperature under different gate delay time and short pulse-width laser power conditions compared with those measured using short SP-LIBS. Moreover, the variation rates of plasma temperatures measured using DP-LIBS were also lower. The superior detection ability was verified by the measurement of aluminum sample in water. The spectra were clearly detected using DP-LIBS, whereas it cannot be identified using SP-LIBS of short and long pulse widths. The effects of gate delay time and short pulse-width laser power were also discussed. These results demonstrate the feasibility and enhanced detection ability of the proposed collinear long and short DP-LIBS method.

Keywords: DP-LIBS; Long pulse; dual-pulse laser-induced breakdown spectroscopy; enhancement; plasma temperature stabilization; underwater measurement.