• High Power Laser Science and Engineering
  • Vol. 4, Issue 1, 010000e8 (2016)
Yingxia Wei1, Yaoxiang Liu1, Tie-Jun Wang1, Na Chen1, Jingjing Ju1, Yonghong Liu1, Haiyi Sun1, Cheng Wang1, Jiansheng Liu1, Haihe Lu1, See Leang Chin2, and Ruxin Li1
Author Affiliations
  • 1State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, China
  • 2Centre d’Optique, Photonique et Laser (COPL) and D′epartement de physique, de g′enie physique et d’optique, Universit′e Laval, Qu′ebec, Qu′ebec G1V 0A6, Canada
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    Abstract

    We report on a systematic experimental study on the fluorescence spectra produced from a femtosecond laser filament in air under a high electric field. The electric field alone was strong enough to create corona discharge (CD). Fluorescence spectra from neutral and ionic air molecules were measured and compared with pure high-voltage CD and pure laser filamentation (FIL). Among them, high electric field assisted laser FIL produced nitrogen fluorescence more efficiently than either pure CD or pure FIL processes. The nonlinear enhancement of fluorescence from the interaction of the laser filament and corona discharging electric field resulted in a more efficient ionization along the laser filament zone, which was confirmed by the spectroscopic measurement of both ionization-induced fluorescence and plasma-scattered 800 nm laser pulses. This is believed to be the key precursor process for filament-guided discharge.2011CB808103), the Chinese Academy of Sciences and the State Key Laboratory of High Field Laser Physics, the 100 Talents Program of Chinese Academy of Sciences, and theShanghai Pujiang Program.
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    Yingxia Wei, Yaoxiang Liu, Tie-Jun Wang, Na Chen, Jingjing Ju, Yonghong Liu, Haiyi Sun, Cheng Wang, Jiansheng Liu, Haihe Lu, See Leang Chin, Ruxin Li. Spectroscopic analysis of high electric field enhanced ionization in laser filaments in air for corona guiding[J]. High Power Laser Science and Engineering, 2016, 4(1): 010000e8
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    Received: Dec. 20, 2015
    Accepted: Jan. 27, 2016
    Published Online: Oct. 25, 2016
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