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Article Dans Une Revue Physical Review A : Atomic, molecular, and optical physics [1990-2015] Année : 2018

Broadband terahertz radiation from two-color mid- and far-infrared laser filaments in air

Résumé

We study THz emission by two-color femtosecond filaments in air using pump wavelengths λ0 from 0.8 to 10.6 µm. Comprehensive three-dimensional numerical simulations show that tens-of-centimeter long filaments created by a 10.6-µm pump pulse can produce mJ energy yields and GV/m field strengths, while the laser-to-THz conversion efficiency exceeds the percent level. Changing temperature and humidity conditions reveals a surprisingly high stability of the THz spectra against different weather conditions. We also examine the role of many-body Coulomb effects on ionization. This additional plasma source promotes longer filaments that act as efficient THz emitters.
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hal-01818373 , version 1 (19-06-2018)

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Alisée Nguyen, Pedro González de Alaiza Martínez, Illia Thiele, Stefan Skupin, Luc Bergé. Broadband terahertz radiation from two-color mid- and far-infrared laser filaments in air. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2018, 97 (6), ⟨10.1103/PhysRevA.97.063839⟩. ⟨hal-01818373⟩
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