Half-cycle pulses in the mid-infrared from a two-color laser-induced filament |
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Authors: | Alexander A. Voronin Yutaka Nomura Hideto Shirai Takao Fuji Aleksei Zheltikov |
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Affiliation: | 1. Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, 119992, Moscow, Russia 2. Russian Quantum Center, Novaya 100, 143025, Skolkovo, Moscow Region, Russia 3. Laser Research Center for Molecular Science, Institute for Molecular Science, 38 Nishigonaka, Myodaiji, Okazaki, 444-8585, Japan 4. Department of Physics and Astronomy, Texas A&M University, College Station, TX, 77843-4242, USA
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Abstract: | Four-wave mixing (FWM) of femtosecond near-infrared laser pulses and its second harmonic in the filamentation regime is shown to give rise to ultrashort field waveforms in the mid-infrared with pulse widths as short as a half of the field cycle and produce ultrabroadband supercontinuum spectra stretching from the mid-IR to the terahertz region. Generation of 7-fs pulses centered at 4.35 μm is demonstrated by a two-color filamentation experiment, where the 25-fs, 800-nm fundamental-wavelength output of a Ti: Sapphire laser is mixed with its second harmonic. The spectral and temporal properties of the mid-IR waveforms, as well as their emission pattern, are consistent with the FWM scenario of frequency conversion generalized to include the Kerr effect and ionization-induced refractive-index modulation. |
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