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Phys Rev Lett. 2007 Jun 8;98(23):235002. Epub 2007 Jun 7.

Conical forward THz emission from femtosecond-laser-beam filamentation in air.

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Laboratoire d'Optique Appliquée, ENSTA, Ecole Polytechnique, CNRS UMR 7639, Palaiseau, 91761 France.


We attribute a strong forward directed THz emission from femtosecond laser filaments in air to a transition-Cherenkov emission from the plasma space charge moving behind the ionization front at light velocity. Distant targets can be easily irradiated by this new source of THz radiation.

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