Spectral dynamics of THz pulses generated by two-color laser filaments in air: the role of Kerr nonlinearities and pump wavelength

被引：45
作者：
Nguyen, A. [1 ]
Martinez, P. Gonzalez de Alaiza [1 ]
Dechard, J. [1 ]
Thiele, I. [2 ]
Babushkin, I. [3 ]
Skupin, S. [2 ]
Berge, L. [1 ]
机构：
[1] CEA DAM, DIF, F-91297 Arpajon, France
[2] Univ Bordeaux CNRS CEA, Ctr Lasers Intenses & Applicat, UMR 5107, F-33405 Talence, France
[3] Leibniz Univ Hannover, Inst Quantum Opt, Welfengarten 1, D-30167 Hannover, Germany
来源：
OPTICS EXPRESS | 2017年 / 25卷 / 05期
关键词：
IONIZATION; PROPAGATION; EMISSION; LIGHT; MODEL;
D O I：
10.1364/OE.25.004720
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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
引用
收藏
页码：4720 / 4740
页数：21
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