Generation of Electric and Magnetic Fields during High-Intensity Laser Radiation Propagation through the Atmosphere
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TICAL INSTRUMENTATION
Generation of Electric and Magnetic Fields during High-Intensity Laser Radiation Propagation through the Atmosphere V. F. Myshkina, S. F. Balandinb, V. A. Donchenkoc, *, V. A. Pogodaevb, V. A. Khana, b, **, E. S. Abramovad, Yu. I. Kulakovc, †, M. S. Pavlovad, V. L. Khazane, and D. M. Horohorina aNational
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Research Tomsk State Polytechnic University, Tomsk, 634050 Russia V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Tomsk, 634055 Russia c Siberian Physical-Technical Institute, Tomsk State University, Tomsk, 634050 Russia dSiberian State University of Telecommunications and Information Sciences, Novosibirsk, 630009 Russia eOmsk State Technical University, Omsk, 644050 Russia *e-mail: [email protected] **e-mail: [email protected] Received September 10, 2019; revised February 13, 2020; accepted February 18, 2020
Abstract—Results are presented of the experimental study of electric and magnetic fields generated during pulsed laser radiation propagation along atmospheric paths in breakdown and prebreakdown modes. Generation of quasi-periodic electric and magnetic fields with a frequency of 105–106 Hz and duration of 10–100 μs during propagation of microsecond CO2 laser pulses through the atmosphere in these modes is ascertained. The maximum values of the induced electric and magnetic fields are observed when the number of breakdown centers per unit path length Nc = 0.17 m−1. The connection of electric and magnetic fields generated around the ionization channel with the atmospheric parameters is shown. Keywords: laser breakdown, ionization channel, electrical pulses, magnetic field, atmospheric parameters DOI: 10.1134/S1024856020050139
INTRODUCTION The processes of generation of quasi-static electric and magnetic fields at the center of optical breakdown during the propagation of high-intensity laser radiation through the atmosphere are related to the most important nonlinear effects. The generation of quasistatic magnetic fields (formerly called spontaneous magnetic fields) was experimentally detected in a spark which occurs during laser radiation focusing [1]. Then, that phenomenon was observed during optical breakdown in (Al2O3) particles exposed to laser radiation [2]. In some experiments, the generation of a magnetic field of about 102 T in strength was detected in the laser plasma [3–6]. There are data on recording magnetic fields of 102 to 105 T in strength when laser radiation impacts on a solid and plasma [7–9]. There are also experimental data which show generation of strong (>1010 V/cm) static electric fields under the impact of high-intensity laser radiation on aerosol media [10–15]. † Deceased.
The study of laser-plasma current generation is important because of the possibility of direct conversion of laser energy into electricity, as well as its transmission over long distances [16]. Laser-induced currents can be used for excitation of high-frequency electromagnetic waves and as sources of superstrong magnetic fields outside the plasma. Calcula
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