Abstract
The propagation of an ultrashort terahertz (THz) pulse in a nonequilibrium plasma channel produced by a UV femtosecond laser pulse in air is investigated theoretically. The analysis is carried out based on joint solution of the second-order wave equation and the Boltzmann kinetic equation in the binomial approximation for the electron velocity distribution function in the channel plasma. We assume that a THz pulse is quite weak and does not produce a reverse action on the electron energy spectrum in the channel plasma. It is shown that the plasma channel in air under a pressure of several atmospheres is a medium for effective amplification of ultrashort THz pulses in the frequency range up to several terahertz.
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This study was supported by the Russian Science Foundation (project no. 18-72-00125). Numerical calculations were performed on the Lomonosov supercomputer complex of the Moscow State University.
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Translated by N. Wadhwa
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Bogatskaya, A.V., Volkova, E.A. & Popov, A.M. Peculiarities of Propagation and Amplification of Ultrashort Terahertz Pulses in Strongly Nonequilibrium Plasma Channels Produced in Air by UV Femtosecond Laser Pulses during Multiquantum Ionization. J. Exp. Theor. Phys. 130, 649–659 (2020). https://doi.org/10.1134/S1063776120040020
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DOI: https://doi.org/10.1134/S1063776120040020