The investigation of fluorescence signal and acoustic signal from femtosecond filamentation

ZHENG Yue; LI Ziyuan; ZHANG Yuxuan; LIU Zuoye

doi:10.7510/jgjs.issn.1001-3806.2023.03.003

LASER TECHNOLOGY > 2023 > 47(3): 305-309. > DOI: 10.7510/jgjs.issn.1001-3806.2023.03.003

ZHENG Yue, LI Ziyuan, ZHANG Yuxuan, LIU Zuoye. The investigation of fluorescence signal and acoustic signal from femtosecond filamentation[J]. LASER TECHNOLOGY, 2023, 47(3): 305-309. DOI: 10.7510/jgjs.issn.1001-3806.2023.03.003

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The investigation of fluorescence signal and acoustic signal from femtosecond filamentation

School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China

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Received Date: April 11, 2022
Revised Date: May 09, 2022
Published Date: May 24, 2023

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Abstract

Abstract

To investigate the intrinsic mechanism of femtosecond laser filament formation to achieve length characterization, fluorescence spectra and acoustic signal information of the plasma filament at different incident laser pulse energies and polarization states were obtained by fluorescence and acoustic methods. The results show that, the intensity of N₂ fluorescence signal produced by circularly polarized light is about twice of that of linearly polarized light with the same laser pulse energy, while the intensity of N₂⁺ fluorescence signal produced by linearly polarized light is about 1.3 times of that of circularly polarized light; Plasma fluorescence measurement is an effective way to obtain the length of plasma filament, which is more accurate than acoustic measurement. This study provides a feasible solution to characterize the filament length by revealing the physical essence of coherent laser emission with filament length.
- laser physics,
- plasma filament,
- evolution of fluorescence intensity,
- acoustic measurement

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