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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry Van Driel
  • Vol. 26, Iss. 11 — Nov. 1, 2009
  • pp: 2016–2027

Polarization of terahertz radiation from laser generated plasma filaments

Daniel Dietze, Juraj Darmo, Stefan Roither, Audrius Pugzlys, James N. Heyman, and Karl Unterrainer  »View Author Affiliations


JOSA B, Vol. 26, Issue 11, pp. 2016-2027 (2009)
http://dx.doi.org/10.1364/JOSAB.26.002016


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Abstract

An analysis of the polarization of terahertz (THz) radiation from a laser-induced plasma source is presented. THz emission is achieved by mixing a laser pulse with its second harmonic after focusing through a β - Ba B 2 O 4 (β-BBO) crystal. Numerical calculations, based on the nonlinear four-wave mixing model and the microscopic polarization model, are compared with experimental results. The main focus lies on the study of the dependence of THz polarization on the polarization and relative phase of the incident fundamental and second-harmonic pulses. We show that the modulation of the fundamental pulse by the BBO crystal has to be taken into account in order to describe experimental observations. By including the finite extension of the plasma and considering cross- and self-phase modulation of the two-color pump pulse, we are able to explain the observed ellipticity of the THz pulse as well as the orientation of the polarization axis.

© 2009 Optical Society of America

OCIS Codes
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(260.3090) Physical optics : Infrared, far

ToC Category:
Nonlinear Optics

History
Original Manuscript: June 10, 2009
Revised Manuscript: September 2, 2009
Manuscript Accepted: September 8, 2009
Published: October 5, 2009

Citation
Daniel Dietze, Juraj Darmo, Stefan Roither, Audrius Pugzlys, James N. Heyman, and Karl Unterrainer, "Polarization of terahertz radiation from laser generated plasma filaments," J. Opt. Soc. Am. B 26, 2016-2027 (2009)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-26-11-2016


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