Broadband terahertz radiation from two-color mid- and far-infrared laser filaments in air
Artikel i vetenskaplig tidskrift, 2018

We study terahertz (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, despite enhanced plasma defocusing.

Författare

Alisée Nguyen

Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA)

Pedro González De Alaiza Martínez

Université de Bordeaux

Illia Thiele

Chalmers, Fysik, Subatomär fysik och plasmafysik

Stefan Skupin

Université de Lyon

Luc Bergé

Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA)

Physical Review A

2469-9926 (ISSN) 2469-9934 (eISSN)

Vol. 97 6 063839

Ämneskategorier

Förnyelsebar bioenergi

Atom- och molekylfysik och optik

Annan fysik

DOI

10.1103/PhysRevA.97.063839

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Senast uppdaterat

2019-09-13