Transmission characteristics of terahertz laser in underdense plasmas generated by DC discharge

In this paper, terahertz (THz) characteristics of a direct current (DC) arc discharge uniform plasma are analyzed, which is of practical significance in plasma diagnostics with electromagnetic waves. A model for estimating total collision frequency of DC arc discharge plasma is built based on the Coulomb model and elastic scattering model. Explicit expressions for attenuation coefficient and transmission coefficient of THz wave propagating through a uniform plasma are obtained, which are expressed as a function of plasma frequency and collision frequency in the DC arc discharge. Detailed numerical analysis and discussions are conducted to reveal the influence of electron density, collision frequency, thickness of the plasma, and incident angle of the wave on the transmission characteristics of THz wave in plasma. Results show that the greater are the electron density, collision frequency and transmission length of a wave propagating in plasma, more power of the wave is attenuated. The attenuation energy of laser under horizontal sending and horizontal receiving (HH) polarity is as same as the vertical sending and vertical receiving (VV) polarity in underdense plasma.

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