Abstract
A mechanism of a significant increase in the yield of Brunel harmonics, which are the lowest odd harmonics generated in a plasma in the process of tunnel ionization of atoms and molecules by an intense laser pulse, has been proposed and analyzed. This mechanism is based on the mutual enhancement of harmonics at the parametric interaction with the field at the fundamental frequency caused by the degenerate ionization-induced multiwave mixing. The results of analytical and numerical calculations show that this can increase the intensities of the generated harmonics by several orders of magnitude.
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Funding
The numerical calculations in this work were supported by the Russian Science Foundation (project no. 18–72–00103) and the analytical studies were supported by the Russian Foundation for Basic Research (project nos. 18–02–01150 and 19–52–12053) and by the Foundation for the Advancement of Theoretical Physics and Mathematics BASIS (project no. 19–1–2–52–1).
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Russian Text © The Author(s), 2019, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2019, Vol. 110, No. 7, pp. 449-455.
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Kostin, V.A., Vvedenskii, N.V. Mutual Enhancement of Brunel Harmonics. Jetp Lett. 110, 457–463 (2019). https://doi.org/10.1134/S0021364019190081
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DOI: https://doi.org/10.1134/S0021364019190081