WIAS Preprint No. 1752, (2012)

3D numerical simulations of THz generation by two-color laser filaments



Authors

  • Bergé, Luc
  • Skupin, Stefan
  • Köhler, Christian
  • Babushkin, Ihar
  • Herrmann, Joachim

2010 Mathematics Subject Classification

  • 78A60 35Q61 35Q60

2008 Physics and Astronomy Classification Scheme

  • 42.65.Jx 32.80.Fb 52.38.Hb 52.25.Os

Keywords

  • THz light generation, Photoionization, Ultrashort pulse propagation

Abstract

Terahertz (THz) radiation produced by the filamentation of two-color pulses over long distances in argon is numerically investigated using a comprehensive model in full space-time resolved geometry. We show that the dominant physical mechanism for THz generation in the filamentation regime at clamping intensity is based on quasi-dc plasma currents. The calculated THz spectra for different pump pulse energies and pulse durations are in agreement with previously reported experimental observations. For the same pulse parameters, near-infrared pump pulses at 2 $mu$m are shown to generate a more than one order of magnitude larger THz yield than pumps centered at 800 nm.

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