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Nitrogen fluorescence induced by the femtosecond intense laser pulses in air

  • He Li (a1) (a2), Suyu Li (a1) (a2), Shuchang Li (a1) (a2), Dunli Liu (a1) (a2), Dan Tian (a1) (a2), Anmin Chen (a1) (a2), Ying Wang (a1) (a2), Xiaowei Wang (a1) (a2), Yunfeng Zhang (a1) (a2) and Mingxing Jin (a1) (a2)...

Abstract

Our experiments show that external focusing and initial laser energy strongly influences filament generated by the femtosecond Ti–sapphire laser in air. The experimental measurements show the filament length can be extended both by increasing the laser energy and focal length of focusing lens. On the other hand, the plasma fluorescence emission can be enhanced by increasing the laser energy with fixed focal length or decreasing the focal length. In addition, the collapse distance measured experimentally are larger than the calculated ones owing to the group-velocity-dispersion effect. In addition, we find that the line widths of the spectral lines from $\text{N}_{2}$ is independent of filament positions, laser energies and external focusing.

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Copyright

This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Corresponding author

Correspondence to:  S. Li and M. Jin, Institute of Atomic and Molecular Physics, Jilin University, Changchun, Jilin Province 130012, China. Email: suyu11@mails.jlu.edu.cn, mxjin@jlu.edu.cn

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