Chinese Optics Letters, 2020, 18 (8): 083001, Published Online: Jul. 10, 2020
Periphery excitation of laser-induced CN fluorescence in plasma using laser-induced breakdown spectroscopy for carbon detection Download: 600次
Abstract
Carbon is hard to be sensitively detected in laser-induced breakdown spectroscopy (LIBS). The optical emission can be significantly enhanced by resonantly exciting CN radicals in the plasma center using LIBS assisted with laser-induced fluorescence (LIBS-LIF). However, the nitrogen source for CN formation is provided by ambient gas. Therefore, we propose a new approach of periphery excitation in plasma to improve CN fluorescence. The optical and spatial characteristics of CN radicals in plasma were discussed. A fluorescence map was established by combining focal point location and fluorescent intensity, demonstrating that plasma periphery had 4.2 times stronger fluorescence than the center.
Nan Zhao, Jiaming Li, Qiongxiong Ma, Liang Guo, Qingmao Zhang. Periphery excitation of laser-induced CN fluorescence in plasma using laser-induced breakdown spectroscopy for carbon detection[J]. Chinese Optics Letters, 2020, 18(8): 083001.