Harilal S S, Brumfield B E, Phillips M C
Opt Lett. 2018 Mar 1;43(5):1055-1058. doi: 10.1364/OL.43.001055.
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 (S2-P2) 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.
我们报告了将激光烧蚀（LA）羽流的激光诱导荧光（LIF）用于远距离应用。对样品中作为主要和次要成分的铝进行远距离分析，是在距离约10米处产生的纳秒激光等离子体中进行的。LA羽流的LIF是通过使用连续波（cw）可调谐激光器在394.4纳米（S2-P2）处共振激发铝跃迁，并在396.15纳米处收集直线荧光信号来实现的。LIF的光谱分辨率是通过扫描cw可调谐LIF激光器跨越选定的铝跃迁来获得的。我们的结果突出表明，与热激发发射相比，LIF提供了增强的信号强度、发射持久性和光谱分辨率。
