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Interferometric diagnostics of femtosecond laser microplasma in gases

  • Interaction of Laser Radiation with Matter
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Abstract

The laser plasma formed in gaseous media due to their optical breakdown under tightly focused femtosecond laser pulses has been experimentally investigated. Pump-probemicrointerferometry is chosen to perform spatial and temporal diagnostics of the plasma. Time dependences of the laser plasma electron density are obtained. It is shown that in breakdown of different gases (air, nitrogen, argon, and helium) at different pressures (in the range from 1 to 10 atm) the electron concentration continues to increase during ∼1 ps when the laser irradiation is over. This effect is related to the impact ionization of the plasma by the hot electrons formed in interaction of intense femtosecond laser pulses with matter. The results of theoretical simulation of the post-ionization processes are presented.

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  1. Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russia

    V. V. Bukin, S. V. Garnov, A. A. Malyutin & V. V. Strelkov

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  1. V. V. Bukin
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  2. S. V. Garnov
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  3. A. A. Malyutin
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  4. V. V. Strelkov
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Correspondence to S. V. Garnov.

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Bukin, V.V., Garnov, S.V., Malyutin, A.A. et al. Interferometric diagnostics of femtosecond laser microplasma in gases. Phys. Wave Phen. 20, 91–106 (2012). https://doi.org/10.3103/S1541308X12020021

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  • DOI: https://doi.org/10.3103/S1541308X12020021

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