Self-absorbed Al lines in laser-induced plasma

23rd 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: Al-alloy;    Laser ablation plasmas;    Laser induced plasma;    Line profiles;    Plasma initiation;    Plasma lines;    Self absorption;    Voigt line profiles;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/810/1/012054/pdf
DOI  :  10.1088/1742-6596/810/1/012054

来源: IOP

【 摘 要 】

Self-reversed line profiles of Al 3s23p → 3s24s transitions in a laser ablation plasma are considered following plasma initiation on the surface of an Al alloy target. Experimental self-absorption correction factors are tabulated by measuring plasma line profiles with and without its reflection using the mirror duplication method. At a delay of 60 ns, measured line profiles 0.5 mm from the Al surface show self-reversed line profiles. Corrected line widths are determined to be 1.1 ± 0.2 and 1.7 ± 0.2 nm for the 394.4 and 396.15 nm lines, respectively, following fitting with a Voigt line profile. Neare determined to be 3.8 ± 0.4 and 10 ± 1 × 1018cm-3, respectively.