Cross-guiding of the 400 nm second harmonic of the Ti:Sapphire laser in the femtosecond filament produced by an 800 nm pump in argon leads to the efficient terahertz generation along the longitudinally extended high intensity region. Based on the vectorial model of the dual pulse co-propagation we found that terahertz yield due to four-wave mixing in the filament maximizes for the same temporal delay between 400 nm and 800 nm pulses as the 400 nm signal after the analyzer crossed to its initially linear polarization direction. This optimum delay goes up with increasing geometrical focusing distance and leads to the maximum terahertz yield if the initial 800 nm pump and the second harmonic polarization directions are parallel to each other.
|Original language||English (US)|
|Number of pages||11|
|Journal||Journal of Infrared, Millimeter, and Terahertz Waves|
|State||Published - Oct 2011|
Bibliographical noteFunding Information:
Acknowledgements We acknowledge the support from Russian Foundation for Basic Research (grants #09-02-01200a, #09-02-01522a, #11-02-12061-ofi-m-2011), Russian Federal Agency for Science and Innovation (contract #02.740.11.0223), the Council of the President of the Russian Federation Grant for Support of Young Scientists MK-2213.2010.2, National Research and Scientific Council of Canada, the Defence Research and Development Canada –Valcartier, Canadian Institute for Photonics Innovation, CFI, FQRNT, and Canada Research Chair.
- Femtosecond filament
- Four-wave mixing (FWM)
- Terahertz (THz) generation