We study, both experimentally and theoretically, the underlying physics of third-harmonic generation in air by a filamented infrared femtosecond laser pulse propagating through a thin plasma channel. It is shown that the recently observed more than two-order-of-magnitude increase of the efficiency of third-harmonic generation occurs due to the plasma-enhanced third-order susceptibility. An estimate of the effective value of this susceptibility is given.
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|Publication status||Published - 10 Mar 2010|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics