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Impact of the dipole contribution on the terahertz emission of air-based plasma induced by tightly focused femtosecond laser pulses

Alexander P. Shkurinov1,2, Anton S. Sinko1, Peter M. Solyankin1,2, Alexander V. Borodin2, Mikhail N. Esaulkov2,*, Vladimir V. Annenkov3,4, Igor A. Kotelnikov3,4, Igor V. Timofeev3,4, and Xi-Cheng Zhang5

  • 1Department of Physics and International Laser Center, Lomonosov Moscow State University, Leninskie Gory, Moscow 119992, Russia
  • 2Institute on Laser and Information Technologies of the Russian Academy of Sciences, Branch of the FSRC “Crystallography and Photonics” RAS, Shatura, Moscow Region 140700, Russia
  • 3Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia
  • 4Novosibirsk State University, Novosibirsk 630090, Russia
  • 5The Institute of Optics, University of Rochester, Rochester, New York 14627-0186, USA

  • *esaulkov_mich@mail.ru
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Phys. Rev. E 95, 043209 – Published 20 April, 2017

DOI: https://doi.org/10.1103/PhysRevE.95.043209

Abstract

The present paper studies the generation mechanism of terahertz (THz) radiation from tightly focused femtosecond laser pulses in a gas medium. We measured the angular radiation pattern under different focusing conditions and observed that, with the deepening of focus, the angular radiation pattern changes and optical-to-THz conversion efficiency increases. The analysis of the observed phenomena led to the assumption that the dipole radiation prevails in most cases despite the existing conception regarding the dominating role of the quadrupole mechanism of radiation. Based on these assumptions, the transient photocurrent theory of the phenomenon presented in this paper was developed by us and used for the numerical fit of the experimental data.

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Phys. Rev. E 95, 043209– Published 20 April, 2017
  • Received 17 January 2017
Article part of CHORUS

©2017 American Physical Society

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