Release Time:2019-03-13  Hits:

Indexed by: Journal Article

Date of Publication: 2019-02-04

Journal: OPTICS EXPRESS

Included Journals: Scopus、SCIE

Volume: 27

Issue: 3

Page Number: 2509-2520

ISSN: 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