%0 Journal Article %T Strong Enhancement of Terahertz Radiation from Laser Filaments in Air by a Static Electric Field %+ Laboratoire d'optique appliquée (LOA) %+ Centre d'Etudes Lasers Intenses et Applications (CELIA) %A Houard, Aurélien %A Liu, Yi %A Prade, Bernard %A Tikhonchuk, Vladimir %A Mysyrowicz, André %< avec comité de lecture %@ 0031-9007 %J Physical Review Letters %I American Physical Society %V 100 %N 25 %P 255006 %8 2008-06-26 %D 2008 %R 10.1103/PhysRevLett.100.255006 %K filamentation %K laser %K nonlinear optics %K plasma %K terahertz %Z PACS: 52.59.Ye, 41.60.−m, 52.25.Os, 52.38.Hb %Z Physics [physics]/Physics [physics]/Optics [physics.optics]Journal articles %X 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. %G English %2 https://polytechnique.hal.science/hal-00455124/document %2 https://polytechnique.hal.science/hal-00455124/file/PRL_staticField_authorVersion.pdf %L hal-00455124 %U https://polytechnique.hal.science/hal-00455124 %~ CEA %~ X %~ ENSTA %~ CNRS %~ X-LOA %~ X-DEP %~ X-DEP-PHYS %~ PARISTECH %~ ENSTA_LOA %~ DAM