Abstract
We present direct time- and space-resolved measurements of the electron density of femtosecond laser pulse-induced plasma filaments. The dominant nonlinearity responsible for extended atmospheric filaments is shown to be field-induced rotation of air molecules.
- Received 3 June 2010
DOI:https://doi.org/10.1103/PhysRevLett.105.215005
© 2010 The American Physical Society