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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 11 — Jun. 2, 2014
  • pp: 13691–13709

Analytical model for THz emissions induced by laser-gas interaction

A. Debayle, L. Gremillet, L. Bergé, and Ch. Köhler  »View Author Affiliations

Optics Express, Vol. 22, Issue 11, pp. 13691-13709 (2014)

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We develop a one-dimensional model of THz emissions induced by laser-driven, time-asymmetric ionization and current oscillations in a hydrogen gas. Our model highlights complex scalings of the THz fields with respect to the laser and gas parameters, in particular, a non-monotonic behavior against the laser parameters. Analytical expressions of the transmitted and reflected fields are presented, explaining the THz spectra observed in particle-in-cell and forward-pulse propagation codes. The backward-propagating THz wave is mainly driven by the electron current oscillations at the plasma frequency, and its resulting spectrum operates below the plasma frequency. The transmitted THz wave is emitted from both plasma current oscillations and photo-ionization. Their respective signal presents a contribution below and around the plasma frequency, plus a contribution at higher frequencies associated to the photo-induced current. The interplay between these two mechanisms relies on the ratio between the propagation length and the plasma skin depth.

© 2014 Optical Society of America

OCIS Codes
(260.5210) Physical optics : Photoionization
(300.6270) Spectroscopy : Spectroscopy, far infrared
(350.5400) Other areas of optics : Plasmas
(350.7420) Other areas of optics : Waves
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Terahertz Optics

Original Manuscript: December 20, 2013
Revised Manuscript: March 25, 2014
Manuscript Accepted: April 18, 2014
Published: May 30, 2014

A. Debayle, L. Gremillet, L. Bergé, and Ch. Köhler, "Analytical model for THz emissions induced by laser-gas interaction," Opt. Express 22, 13691-13709 (2014)

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