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The fluorescence feature of plasma induced by femtosecond laser pulses in air

Guo Kai-Min Gao Xun Hao Zuo-Qiang Lu Yi Sun Chang-Kai Lin Jing-Quan

The fluorescence feature of plasma induced by femtosecond laser pulses in air

Guo Kai-Min, Gao Xun, Hao Zuo-Qiang, Lu Yi, Sun Chang-Kai, Lin Jing-Quan
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  • Received Date:  03 June 2011
  • Accepted Date:  05 April 2012
  • Published Online:  05 April 2012

The fluorescence feature of plasma induced by femtosecond laser pulses in air

    Corresponding author: linjingquan@cust.edu.cn
  • 1. School of Science, Changchun University of Science and Technology, Changchun 130022, China;
  • 2. School of Physical Science and Technology, Baotou Teachers College, Baotou 014030, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant Nos. 11074027, 60978014 and 61178022), the Jilin Commission of Science and Technology (Grant Nos. 20100521, 20100168 and 20111812), the Educational Commission of Jilin Province (Grant No. [2009]40), the International Cooperation projects of Changchun Technology Division (Grant No. 09GH01), and the Science and Technology on Electro-optical Information Security Control Laboratory (Grant No. 9140c150302110c1501).

Abstract: 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.

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