期刊
OPTICS EXPRESS
卷 25, 期 5, 页码 4720-4740出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.25.004720
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资金
- ANR/ASTRID Project ALTESSE [ANR-15-ASTR-0009]
- PRACE [2014-112576]
- GENCI [2016-057594]
- DFG [850/20-1 - RSF, 16-42-01060]
- Qatar National Research Fund through the National Priorities Research Program [NPRP 8-246-1-060]
- Agence Nationale de la Recherche (ANR) [ANR-15-ASTR-0009] Funding Source: Agence Nationale de la Recherche (ANR)
We theoretically and numerically study the influence of both instantaneous and Raman-delayed Kerr nonlinearities as well as a long-wavelength pump in the terahertz (THz) emissions produced by two-color femtosecond filaments in air. Although the Raman-delayed nonlinearity induced by air molecules weakens THz generation, four-wave mixing is found to impact the THz spectra accumulated upon propagation via self-, cross-phase modulations and self- steepening. Besides, using the local current theory, we show that the scaling of laser-to-THz conversion efficiency with the fundamental laser wavelength strongly depends on the relative phase between the two colors, the pulse duration and shape, rendering a universal scaling law impossible. Scaling laws in powers of the pump wavelength may only provide a rough estimate of the increase in the THz yield. We confront these results with comprehensive numerical simulations of strongly focused pulses and of filaments propagating over meter-range distances. (C) 2017 Optical Society of America
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