Generation of terahertz radiation from ionizing two-color laser pulses in Ar filled metallic hollow waveguides
- Babushkin, Ihar
- Skupin, Stefan
- Herrmann, Joachim
2010 Mathematics Subject Classification
- 78A60 35Q61 35Q60
2008 Physics and Astronomy Classification Scheme
- 42.65.Tg, 32.80.Fb, 42.65.-k
- THz light generation, Ionization, Ultrashort optical pulse propagation
The generation of THz radiation from ionizing two-color femtosecond pulses propagating in metallic hollow waveguides filled with Ar is numerically studied. We observe a strong reshaping of the low-frequency part of the spectrum. Namely, after several millimeters of propagation the spectrum is extended from hundreds of GHz up to $sim 150$ THz. For longer propagation distances, nearly single-cycle near-infrared pulses with wavelengths around 4.5 $mu$m are obtained by appropriate spectral filtering, with an efficiency of up to 0.25 %.
- Optics Express, 18 (2010) pp. 9658--9663.