Coherent and incoherent radial THz radiation emission from femtosecond filaments in air.
We show that the THz radiation emitted in the radial direction by a femtosecond filament created in air is linearly polarized and coherent. By applying an electric field along the filament axis this THz radiation is strongly enhanced and becomes incoherent and not polarized.
D'Amico
C
C
Houard
A
A
Franco
M
M
Prade
B
B
Mysyrowicz
A
A