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Indexed by:期刊论文

Date of Publication:2019-02-04

Journal:OPTICS EXPRESS

Included Journals:SCIE、Scopus

Volume:27

Issue:3

Page Number:2509-2520

ISSN No.:1094-4087

Key Words:Atomic emission spectroscopy; Copper alloys; Laser produced plasmas; Laser pulses; Tungsten alloys, Analytical performance; Comparative studies; Emission spectrums; Laser induced plasma; Laser-pulse energy; Laserinduced breakdown spectroscopy (LIBS); Plasma formations; Tungsten copper alloys, Argon lasers

Abstract:The onset of self-absorption of laser-induced plasma poses a problem for converting emission line intensities to concentrations, which is one of the main bottlenecks in quantitative laser-induced breakdown spectroscopy (LIBS) measurements. In this paper, the effects of atmosphere and laser fluence on self-absorption reduction of the plasma induced on tungsten-copper alloy target were investigated with nanosecond infrared (1064 nm) laser pulse over a range of 2.9 to 18.2 J/cm(2). The time-resolved features of self-absorption, and temperature and electron density of the plasma were characterized in atmospheric air and argon, respectively. The experimental results show the effect of self-absorption can be significantly reduced by increasing the laser pulse energy. The argon atmosphere is more helpful for self-absorption reduction. The time-resolved diagnostics of emission spectra in the early stage of the plasma formation are very effective to prevent self-absorption to improve the LIBS analytical performance. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement