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3 May 2021 Coherently enhanced THz-to-microwave ultrashort field waveforms from mid-infrared-driven laser plasmas
Alexandr V. Mitrofanov, Dmitri A. Sidorov-Biryukov, Mikhail Rozhko, Alexander A. Voronin, Maxim Nazarov, Andrey B. Fedotov, Alexei M. Zheltikov
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Proceedings Volume 11770, Nonlinear Optics and Applications XII; 117700J (2021) https://doi.org/10.1117/12.2590404
Event: SPIE Optics + Optoelectronics, 2021, Online Only
Abstract
With the wavelength of a short-pulse laser driver shifted to the midinfrared range, the low-frequency output of laser-induced plasmas can be drastically enhanced, as our experiments show, providing a source of ultrabroadband radiation with a spectrum spanning across the entire terahertz, millimeter-wave, and microwave bands. At low gas pressures, such ultrabroadband field waveforms are shown to rapidly build up their coherence, developing a well-resolved emission cone, dominated by a radial radiation energy flux. As counterintuitive as it may seem, this behavior of the intensity, coherence, and polarization of the low-frequency plasma output is shown to be consistent with a physical scenario of Cherenkov-type radiation emission by ponderomotively driven plasma currents.
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Alexandr V. Mitrofanov, Dmitri A. Sidorov-Biryukov, Mikhail Rozhko, Alexander A. Voronin, Maxim Nazarov, Andrey B. Fedotov, and Alexei M. Zheltikov "Coherently enhanced THz-to-microwave ultrashort field waveforms from mid-infrared-driven laser plasmas", Proc. SPIE 11770, Nonlinear Optics and Applications XII, 117700J (3 May 2021); https://doi.org/10.1117/12.2590404
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KEYWORDS
Plasmas
Microwave radiation
Polarization
Terahertz radiation
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