%0 Journal Article
%T The fluorescence feature of plasma induced by femtosecond laser pulses in air<br>空气中飞秒激光等离子体荧光辐射光谱研究
%A Guo Kai-Min
%A Gao Xun
%A Hao Zuo-Qiang
%A Lu Yi
%A Sun Chang-Kai
%A Lin Jing-Quan
%A <br>郭凯敏
%A 高 勋
%A 郝作强
%A 鲁毅
%A 孙长凯
%A 林景全
%J 物理学报
%D 2012
%I 
%X Effects of focusing conditions on femtosecond laser induced plasma fluorescence in air are investigated by using different focal length lenses. Under the tightly focusing condition, the fluorescence spectra are composed mainly of continuous spectrum and line spectra from N and O atoms, which is due to the higher laser intensity and corresponding higher electron density than those in the case of weakly focused laser beam. In the latter case, only line spectra from air molecules are observed. Besides, the intensity of line spectrum as a function of propagation distance is measured, which reveals the evolution of the plasma filaments.
%K femtosecond laser
%K plasma filaments
%K fluorescence spectra
%K optical breakdown<br>飞秒激光
%K 等离子体细丝
%K 荧光光谱
%K 光学击穿
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=78F360FC29C4791139AEF283C7EC0D23&yid=99E9153A83D4CB11&vid=1D0FA33DA02ABACD&iid=DF92D298D3FF1E6E&sid=7B271B40BA87D9EC&eid=52B7F9E0DD1A536D&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=17