Strong Enhancement of Terahertz Radiation from Laser Filaments in Air by a Static Electric Field

Abstract : We observe a 3 order of magnitude enhancement of the terahertz energy radiated by a femtosecond pulse undergoing filamentation in air in the presence of a static electric field. Measurements of terahertz pulse duration, spectrum, polarization, and radiation pattern elucidate the physical processes responsible for this radiation. A theoretical model explains the results and predicts another 3 orders of magnitude enhancement with a terawatt laser pulse.
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Aurélien Houard, Yi Liu, Bernard Prade, Vladimir Tikhonchuk, André Mysyrowicz. Strong Enhancement of Terahertz Radiation from Laser Filaments in Air by a Static Electric Field. Physical Review Letters, American Physical Society, 2008, 100 (25), pp.255006. ⟨10.1103/PhysRevLett.100.255006⟩. ⟨hal-00455124⟩

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