Bergé, Luc
[Verfasser:in];
Skupin, Stefan
[Verfasser:in];
Köhler, Christian
[Verfasser:in];
Babushkin, Ihar
[Verfasser:in];
Herrmann, Joachim
[Verfasser:in]
3D numerical simulations of THz generation by two-color laser filaments
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Beschreibung:
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.