• Infrared and Laser Engineering
  • Vol. 50, Issue 5, 20210108 (2021)
Ji Zhao1, Xiaolin Du1, Xiuli Nie1, Mei Jiao1, Yan Li1, Liangliang Zhang2, and Cunlin Zhang2
Author Affiliations
  • 1China North Vehicle Research Insitute, Beijing 100072, China
  • 2Department of Physics, Capital Normal University, Beijing 100048, China
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    DOI: 10.3788/IRLA20210108 Cite this Article
    Ji Zhao, Xiaolin Du, Xiuli Nie, Mei Jiao, Yan Li, Liangliang Zhang, Cunlin Zhang. Influence of nonlinear interaction between femtosecond plasmas on ultra-high frequency electromagnetic waves[J]. Infrared and Laser Engineering, 2021, 50(5): 20210108 Copy Citation Text show less

    Abstract

    The influence of the nonlinear interaction between femtosecond plasmas on the ultra-high frequency electromagnetic wave—terahertz (THz) wave was mainly studied in this paper. Many research institutions had confirmed that in the process of generating THz wave, the interaction between plasmas would affect THz wave. Combined theoretical analysis, a test system for generating THz wave due to the coincidence of two-beam plasmas was designed by the author. The study found that the nonlinear interaction between plasmas will produce a third-order nonlinear optical effect. The refractive index and phase of the plasma changed to form a non-uniform field, which led to a decrease in the radiant energy of the THz wave. In the experimental measurement research, it was found that with the increase of the plasma wavelength of the double beam plasma wavelength, the plasma density increased, resulting in a more obvious decrease in the radiation energy of the THz wave. In addition, the greater the plasma power, the greater the absorption of THz wave. At the same time, it was found that the mass of inert gas molecules around the plasma affected terahertz reduction degree. The mass of gas molecules determined the intensity of the electric field formed by the plasma ionized by the femtosecond laser focusing on the air. The higher the molecular mass, the stronger the intensity of the electric field formed, and the greater the magnitude of the THz wave reduced when the two-beam plasma overlapped. The study provides more comprehensive theoretical support for influence of the nonlinear interaction between plasmas on the THz wave, which helps to promote the rapid development of THz wave technology in the military and civilian fields.
    Ji Zhao, Xiaolin Du, Xiuli Nie, Mei Jiao, Yan Li, Liangliang Zhang, Cunlin Zhang. Influence of nonlinear interaction between femtosecond plasmas on ultra-high frequency electromagnetic waves[J]. Infrared and Laser Engineering, 2021, 50(5): 20210108
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