| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Terahertz Radiation from a Longitudinal Electric Field Biased Femtosecond Filament in Air |
| Yi Liu1**, Shaojie Liu1, Aurélien Houard2, André Mysyrowicz2, Vladimir T. Tikhonchuk3,4 |
1Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China
2Laboratoire d'Optique Appliquée, ENSTA Paris, Ecole Polytechnique, CNRS, Institut Polytechnique de Paris, 828 Boulevard des Maréchaux, 91762 Palaiseau cedex, France
3Centre Lasers Intenses et Applications, University of Bordeaux-CNRS-CEA, 351 Cours de la Liberation, 33405 Talence cedex, France
4ELI-Beamlines, Institute of Physics, Czech Academy of Sciences, 25241 Dolní Břežany, Czech Republic
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| Cite this article: |
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Yi Liu, Shaojie Liu, Aurélien Houard et al 2020 Chin. Phys. Lett. 37 065201 |
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Abstract The terahertz (THz) temporal waveform and spectrum from a longitudinal electrically biased femtosecond filament is studied experimentally. The initial direction of the electron motion inside the unbiased filament plasma is deduced from the transformation of the THz temporal waveform with applied fields of opposite polarities. Furthermore, a spectrum shift to lower frequency of the THz spectrum is observed in the presence of a biased field. It agrees well with theoretical predictions.
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Received: 05 March 2020
Published: 26 May 2020
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| PACS: |
52.59.Ye
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(Plasma devices for generation of coherent radiation ?)
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41.60.-m
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(Radiation by moving charges)
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52.25.Os
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(Emission, absorption, and scattering of electromagnetic radiation ?)
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52.38.Hb
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(Self-focussing, channeling, and filamentation in plasmas)
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| Fund: *Supported by the National Natural Science Foundation of China (Grant No. 11574213) and the Innovation Program of Shanghai Municipal Education Commission (Grant No. 2017–01-07-00-07-E00007). |
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