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.
D'Amico
C
C
Laboratoire d'Optique Appliquée, ENSTA, Ecole Polytechnique, CNRS UMR 7639, Palaiseau, 91761 France.
Houard
A
A
Franco
M
M
Prade
B
B
Mysyrowicz
A
A
Couairon
A
A
Tikhonchuk
V T
VT