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Kvantovaya Elektronika, 2018, Volume 48, Number 9, Pages 826–832 (Mi qe16888)  

Interaction of laser radiation with matter. Laser plasma

Temporal dynamics of air plasma glow under different focusing conditions of a femtosecond radiation pulse

N. G. Ivanov, V. F. Losev, V. E. Prokop'ev

Institute of High Current Electronics, Siberian Branch of the Russian Academy of Sciences, Tomsk

Abstract: We report the results of the spectral and temporal investigations of air plasma glow with a temporal resolution of ~2 ps. The plasma was produced by 950-nm laser pulses 60 fs in duration. It is shown that the spectrum obtained for a numerical aperture NA > 0.1 is dominated by atomic and ionic lines of oxygen and nitrogen against the background of a high-intensity continuous spectrum in the visible region. For NA < 0.07, the lines of the second positive system of molecular nitrogen N2 and the first negative system of N2+ molecular ions make their appearance in the spectrum. For NA < 0.03, the spectrum consists only of the molecular lines of N2 and N2+. The emission intensity peaks of these lines lag behind the laser pulse by 10–12 ps, but the atomic lines begin to shine 80–100 ps after the instant of irradiation. The characteristic time of line glow decay to a 1/e level amounts to 18 ps for N2+, to 27 ps for N2, and to 20 ns for atomic lines.

Keywords: femtosecond laser radiation, focusing in the air, numerical aperture, molecular and atomic emission lines, radiation pulse duration, second harmonic, spectral line, plasma radiation.

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English version:
Quantum Electronics, 2018, 48:9, 826–832

Bibliographic databases:

Received: 04.04.2018
Revised: 21.05.2018

Citation: N. G. Ivanov, V. F. Losev, V. E. Prokop'ev, “Temporal dynamics of air plasma glow under different focusing conditions of a femtosecond radiation pulse”, Kvantovaya Elektronika, 48:9 (2018), 826–832 [Quantum Electron., 48:9 (2018), 826–832]

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  • Квантовая электроника Quantum Electronics
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