Abstract
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.
- Received 21 February 2007
DOI:https://doi.org/10.1103/PhysRevLett.98.235002
©2007 American Physical Society