摘要
Recent progress in filament-induced atmospheric sensing is reviewed. Self-guided propagation of ultrashort laser pulses in air induces laser filamentation. All molecules in the path of a filament can be dissociated into highly excited fragments, resulting in emission of characteristic fluorescence spectra. The fluorescence spectra provide information about the various molecules in the filaments. By using a filament-induced ＂fingerprinting＂ fluorescence technique, molecules in the atmosphere can be identified.
Recent progress in filament-induced atmospheric sensing is reviewed. Self-guided propagation of ultrashort laser pulses in air induces laser filamentation. All molecules in the path of a filament can be dissociated into highly excited fragments, resulting in emission of characteristic fluorescence spectra. The fluorescence spectra provide information about the various molecules in the filaments. By using a filament-induced ＂fingerprinting＂ fluorescence technique, molecules in the atmosphere can be identified.
基金
Project supported by the National Basic Research Program of China(Grant No.2011CB808105)
the International Science and Technology Collaboration Program,China(Grant Nos.2010DFA04410 and 11530700900)
the National Key Scientific Instrument Project(Grant No.2012YQ150092)
the Canada Research Chair,Natural Sciences and Engineering Research Council of Canada,Canada Foundation for Innovation,Canadian Institute for Photonics Innovation and le FQRNT
