Journal
PHYSICAL REVIEW A
Volume 97, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.97.063839
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Funding
- ANR/ASTRID Project ALTESSE [ANR-15-ASTR-0009]
- GENCI [A0020507594]
- Qatar National Research Fund [NPRP 8-246-1-060]
- Agence Nationale de la Recherche (ANR) [ANR-15-ASTR-0009] Funding Source: Agence Nationale de la Recherche (ANR)
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We study terahertz (THz) emission by two-color femtosecond filaments in air using pump wavelengths.0 from 0.8 to 10.6 mu m. Comprehensive three-dimensional numerical simulations show that tens-of-centimeter long filaments created by a 10.6-mu m 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.
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