title: [Effects of laser shot frequency on plasma radiation characteristics].
abstract: To improve the quality of laser-induced breakdown spectroscopy, nanosecond pulse laser generated by Nd:YAG laser was used to excite soil sample. The intensity and signal-to-background ratio of A1 I 394.401 nm, Ba I 455.403 nm, Fe I 430.791 nm and Ti I 498.173 nm were observed using a grating spectrometer and a photoelectric detection system. The effects of laser shot frequency (5, 10 and 15 Hz)on the radiation characteristics of laser-induced plasma was studied. The experimental results show that as compared with the laser shot frequency of 5 Hz, the spectral line intensity of A1, Ba, Fe and Ti increased by about 50.94%, 112.7%, 107.46%, and 99.38% at 15 Hz respectively under the same laser energy, while the spectral signal-to-background ratio increased by about 15.16%, 24.08%, 40.26% and 72.06% respectively. The effects mechanism of the laser shot frequency on radiation characteristics of plasma is explained by measuring plasma parameters.
authors: College of Physics Science and Technology, Hebei University, Baoding 071002, China. chenjinzhongcn@126.com
authors: Jin-Zhong
authors: JZ
authors: Chen
authors: Jin-Ning
authors: JN
authors: Bai
authors: Guang-Ju
authors: GJ
authors: Song
authors: Jiang
authors: J
authors: Sun
authors: Ze-Chao
authors: ZC
authors: Deng
authors: Ying-Long
authors: YL
authors: Wang