(Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2010) Babuškin, Ihar; Skupin, Stefan; Herrmann, Joachim
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 150 THz. For longer
propagation distances, nearly single-cycle near-infrared pulses with
wavelengths around 4.5 μm are obtained by appropriate spectral filtering,
with an efficiency of up to 0.25 %.
