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