Conical forward THz emission from femtosecond-laser-beam filamentation in air.
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.
Laboratoire d'Optique Appliquée, ENSTA, Ecole Polytechnique, CNRS UMR 7639, Palaiseau, 91761 France.
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D'Amico
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Houard
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Franco
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Prade
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Mysyrowicz
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Couairon
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Tikhonchuk