Open AccessStandoff analysis of laser-produced plasmas using laser-induced fluorescence
Author(s) -
S. S. Harilal,
Brian E. Brumfield,
Mark C. Phillips
Publication year - 2018
Publication title -
optics letters/optics index
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.43.001055
Subject(s) - laser , optics , materials science , laser induced fluorescence , nanosecond , fluorescence , laser ablation , plasma , excited state , emission spectrum , ablation , dye laser , spectral line , atomic physics , physics , engineering , quantum mechanics , astronomy , aerospace engineering
We report the use of laser-induced fluorescence (LIF) of laser ablation (LA) plumes for standoff applications. The standoff analysis of Al, as major and minor species in samples, is performed in a nanosecond laser-produced plasma created at a distance of ∼10 m. The LIF of LA plumes is carried out by resonantly exciting an Al transition at 394.4 nm (S 1/2 2-P 1/2 2) using a continuous wave (cw) tunable laser and by collecting the direct-line fluorescence signal at 396.15 nm. The spectral resolution of LIF is obtained by scanning the cw tunable LIF laser across the selected Al transition. Our results highlight that LIF provides enhanced signal intensity, emission persistence, and spectral resolution when compared to thermally excited emission.