Physics of the conical broadband terahertz emission from two-color laser-induced plasma filaments

Andrei Gorodetsky, Anastasios D. Koulouklidis, Maria Massaouti, Stylianos Tzortzakis

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44 Citations (Scopus)


We propose a comprehensive physical model explaining the conical character of broadband terahertz generation from femtosecond two-color laser-induced air plasma filaments. We show, that, in contrast to other models, emission is always conical, resulting from phase matching of the radiation produced inside the filament combined with a partial back reflection of the generated terahertz field from the filament itself due to the frequency-dependent critical plasma density. The obtained conical angle varies from 2 o 10, depending on the plasma density distribution and filament length. Unlike previously proposed models, our model shows good agreement with our experiments as well as a wide range of experimental findings from the literature.

Original languageEnglish
Article number033838
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number3
Publication statusPublished - 21 Mar 2014
Externally publishedYes


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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