期刊
OPTICS EXPRESS
卷 26, 期 20, 页码 25750-25760出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.26.025750
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- US Air Force Research Laboratory (AFRL) [FA8650-16-C-2725]
Laser-induced breakdown spectroscopy (LIBS) evaluates the emission spectra of ions, radicals, and atoms generated from the breakdown of molecules by the incident laser, however, the LIBS signal is unstable at elevated pressures. To understand the cause of the signal instability, we perform simultaneous time-resolved measurements of the electron density and LIBS emission signal for nitrogen (568 nm) and hydrogen (656 nm) at high pressure (up to 11 bars). From correlations between the LIBS signal and electron number density, we find that the uncontrollable generation of excess electrons at high pressure causes high instability in the high-pressure LIBS signal. A possible method using ultrafast lasers is proposed to circumvent the uncontrolled electron generation and improve signal stability at high pressure. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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