Effect of molecular orbital angular momentum on spatial distribution of fluorescence during femtosecond laser filamentation in air

2021 ◽  
Author(s):  
Lu Sun ◽  
Nan Zhang ◽  
Weiwei Liu
Keyword(s):  
Spatial Distribution ◽  
Angular Momentum ◽  
Femtosecond Laser ◽  
Molecular Orbital ◽  
Orbital Angular Momentum ◽  
Laser Filamentation

scholarly journals Spatial distribution of nitrogen fluorescence emission induced by femtosecond laser filamentation in air

2021 ◽  
Vol 70 (13) ◽  
pp. 134206
Author(s):  
Yun Zhang ◽  
Shuang Lin ◽  
Yun-Feng Zhang ◽  
He Zhang ◽  
Ming-Ying Chang ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Femtosecond Laser ◽  
Fluorescence Emission ◽  
Laser Filamentation

scholarly journals Equivalence Ratio Measurements in CH4/Air Gases Based on the Spatial Distribution of the Emission Intensity of Femtosecond Laser-Induced Filament

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 2022
Author(s):  
Ming Li ◽  
Jiangpeng Gu ◽  
Dayuan Zhang ◽  
Qiang Gao ◽  
Bo Li
Keyword(s):  
Spatial Distribution ◽  
Flow Field ◽  
Femtosecond Laser ◽  
Emission Intensity ◽  
Equivalence Ratio ◽  
Femtosecond Lasers ◽  
Diagnostic Techniques ◽  
Spatially Resolved ◽  
Combustion Diagnostics ◽  
Laser Filamentation

Femtosecond lasers have been used in combustion diagnostics. Based on the characteristics of femtosecond laser filamentation, many diagnostic techniques have been developed. Here, we propose a method, based on femtosecond laser filamentation, for equivalence ratio measurements in CH4/air gases. By measuring the spatially resolved spectra of the femtosecond laser-induced filament, we found that the variation of the equivalence ratio in the flow field would affect the spatial distribution of the emission intensity of femtosecond laser-induced filament. On this basis, the equivalence ratio was calibrated by using the relative spatial positions of N2 (337 nm) and C2 (516.5 nm) signals in the filament. This method overcomes the interference of local air disturbance, having lower measurement uncertainty.

Spatial distribution of the fluorescence induced by femtosecond laser filamentation in ambient air

2020 ◽  
Vol 131 ◽  
pp. 106417
Author(s):  
Jiabin Wu ◽  
Zhiyong Wu ◽  
Tao Chen ◽  
He Zhang ◽  
Yunfeng Zhang ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Femtosecond Laser ◽  
Ambient Air ◽  
Laser Filamentation
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