Spectrally resolved wave-mixing between near- and far-infrared pulses in gas

Matteo Clerici, Daniele Faccio, Lucia Caspani, Marco Peccianti, O. Yaakobi, Bruno E. Schmidt, M. Shalaby, F. Vidal, François Légaré, Tsuneyuki Ozaki, R. Morandotti

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Abstract

We investigate the nonlinear wave-mixing in gases between intense, short optical pulses and long-wavelength fields (mid infrared and terahertz). We show numerically that the beating between the sum- and difference-frequency generation components can be isolated in the spectrogram of the interaction, and can be used to sample the electric field oscillations of the long-wavelength pulses. This, in turn, could be employed as a possible characterization method that provides information on the real electric field amplitude. Our numerical model is supported by spectrally resolved measurements of the four-wave mixing signals obtained from the interaction of intense, single-cycle terahertz fields (λ > 15 μm) and optical pulses (λ sime 800 nm, 50 fs duration) in air.
Original languageEnglish
Article number125011
JournalNew Journal of Physics
Volume15
DOIs
Publication statusPublished - Dec 2013

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