| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Characterization of Femtosecond Laser-Induced Plasma under Low Pressure in Argon |
| CAO Yu, LIU Xiao-Liang, XIAN Wen-Duo, SUN Shao-Hua, SUN Ming-Ze, DING Peng-Ji, SHI Yan-Chao, LIU Zuo-Ye**, HU Bi-Tao** |
School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000
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| Cite this article: |
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CAO Yu, LIU Xiao-Liang, XIAN Wen-Duo et al 2015 Chin. Phys. Lett. 32 035203 |
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Abstract An experiment of femtosecond laser-induced breakdown in argon with a pressure below normal atmospheric pressure is performed. The breakdown spectrum is mainly due to the electronic relaxation of excited Ar atoms and Ar ions. The lifetimes and characteristics of the Ar plasma are extensively studied by the time-integrated and time-resolved optical emission spectroscopy technique, which is also discussed. Under the assumption of local thermodynamic equilibrium (LTE), the plasma temperature is calculated. Moreover, the electron density is accessed from the Stark broadening of the ionized argon lines. Finally, the validity of applications of LTE is also discussed.
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Published: 26 February 2015
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| PACS: |
52.50.Jm
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(Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.))
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52.27.Aj
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(Single-component, electron-positive-ion plasmas)
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52.70.Kz
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(Optical (ultraviolet, visible, infrared) measurements)
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Abstract
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