WIAS Preprint No. 1483, (2010)

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 %.

Appeared in

  • Optics Express, 18 (2010) pp. 9658--9663.

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