Lasing from molecular nitrogen ions in laser plasma

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Abstract

We presented the results of study of lasing from molecular nitrogen ions in laser plasma produced by femtosecond radiation pulse. It is shown that the maximum intensities at the wavelengths of 391.4 and 427.8 nm are observed at nitrogen pressure of 30 and 500 mbar respectively. The radiation divergence is tens mrad and is close to geometric. When the focal length of lens changes from 15 to 40 cm the pulse duration at wavelength of 391.4 nm varies from 1.83 to 3.5 ps.

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About the authors

V. F. Losev

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

Author for correspondence.
Email: losev@ogl.hcei.tsc.ru
Russian Federation, Tomsk

I. A. Zyatikov

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

Email: losev@ogl.hcei.tsc.ru
Russian Federation, Tomsk

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2. Fig. 1. Dependences of generation intensity at wavelengths 391.4 nm (a) and 427.8 nm (b) at different nitrogen pressure and optimal pump energy values of 6 mJ on pure nitrogen in the laser chamber (1) and air (2). F = 30 cm

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3. Fig. 2. Experimentally measured generation pulse durations at F = 15 (a), 30 (b) and 40 cm (c). P = 30 mbar. E = 6 mJ. The zero point corresponds to the arrival time of the pump pulse

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4. Fig. 3. Dependence of the experimental (1) and estimated (2) divergence of radiation on the focal length of the lens. The inset shows the beam profile at a wavelength of 391.4 nm in the far field. E = 8 mJ, P = 30 mbar

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