Time-resolved aluminium laser-induced plasma temperature measurements

22nd International Conference on Spectral Line Shapes

Surmick, D.M.^1 ; Parigger, C.G.^1

University of Tennessee, Space Institute, 411 B.H. Goethert Parkway, Tullahoma

TN

37388, United States^1

关键词: Electron number densities;    Experimental spectra;    Laser induced plasma;    Nelder-Mead algorithms;    Pulsed Nd:YAG laser;    Spectral measurement;    Temperature profiles;    Theoretical calculations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/548/1/012046/pdf
DOI  :  10.1088/1742-6596/548/1/012046

来源: IOP

【 摘 要 】

We seek to characterize the temperature decay of laser-induced plasma near the surface of an aluminium target from laser-induced breakdown spectroscopy measurements of aluminium alloy sample. Laser-induced plasma are initiated by tightly focussing 1064 nm, nanosecond pulsed Nd:YAG laser radiation. Temperatures are inferred from aluminium monoxide spectra viewed at systematically varied time delays by comparing experimental spectra to theoretical calculations with a Nelder Mead algorithm. The temperatures are found to decay from 5173 ± 270 to 3862 ± 46 Kelvin from 10 to 100 μs time delays following optical breakdown. The temperature profile along the plasma height is also inferred from spatially resolved spectral measurements and the electron number density is inferred from Stark broadened Hβspectra.