Strong enhancement of terahertz radiation from laser filaments in air by a static electric field |
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| Authors: | Houard Aurélien Liu Yi Prade Bernard Tikhonchuk Vladimir T Mysyrowicz André |
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| Institution: | Laboratoire d'Optique Appliquée, ENSTA, Ecole Polytechnique, CNRS UMR 7639, Palaiseau, 91761 France. |
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| 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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