| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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The Angular Distribution of Optical Emission Spectroscopy from a Femtosecond Laser Filament in Air |
| SUN Shao-Hua, LIU Xiao-Liang, LIU Zuo-Ye, WANG Xiao-Shan, DING Peng-Ji, LIU Qing-Cao, GUO Ze-Qin, HU Bi-Tao** |
School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000
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| Cite this article: |
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SUN Shao-Hua, LIU Xiao-Liang, LIU Zuo-Ye et al 2013 Chin. Phys. Lett. 30 045202 |
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Abstract Spatial characterization of a femtosecond laser pulse filament in air is experimentally investigated by detecting the optical emission spectroscopy of laser-induced plasmas. It is shown that the intensity of N I spectral lines have different angular distributions along the filament and the calculated results fit the experimental data well. The obtained degree of atomic polarization along the filament strongly depends on the electron density and the propagation characteristic of the femtosecond laser pulse.
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Received: 05 December 2012
Published: 28 April 2013
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| PACS: |
52.38.Hb
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(Self-focussing, channeling, and filamentation in plasmas)
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32.30.Jc
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(Visible and ultraviolet spectra)
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42.25.Ja
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(Polarization)
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