AUTHOR=Li Ziting , Chen Jinming , Liu Zhaoxiang , Li Yi , Chu Yuxi , Chen Ye , Cheng Ya 

TITLE=Free-radical fluorescence emissions induced by 1,030 nm femtosecond laser filamentation in ethanol flame

JOURNAL=Frontiers in Physics

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.1029954

DOI=10.3389/fphy.2022.1029954

ISSN=2296-424X

ABSTRACT=We experimentally investigate clean optical emissions from multiple combustion intermediates including free radicals C2, CH, and CN at multiple wavelengths induced by    ultrashort 1030-nm laser pulses. We systematically study the evolution of the fluorescence emissions induced by femtosecond laser filament in the combustion field with the parameters such as the laser pulse energy, pulse duration and focal length. Comparing with the previous work, we promote that the fluorescence emissions of the combustion product can be manipulated effectively by controlling the femtosecond laser characteristics including pulse energy, duration and the focusing conditions. This process helps to optimize its signal-to-noise ratio, which providing a further application of the femtosecond laser pulses to sense the combustion intermediates.