Absorption of laser radiation by femtosecond laser-induced plasma of air and its emission characteristics

A. A. Ilyin; S. S. Golik; K. A. Shmirko

doi:10.1117/12.2205791

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19 November 2015 Absorption of laser radiation by femtosecond laser-induced plasma of air and its emission characteristics

A. A. Ilyin, S. S. Golik, K. A. Shmirko

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Proceedings Volume 9680, 21st International Symposium Atmospheric and Ocean Optics: Atmospheric Physics; 96801Y (2015) https://doi.org/10.1117/12.2205791
Event: XXI International Symposium Atmospheric and Ocean Optics. Atmospheric Physics, 2015, Tomsk, Russian Federation

Abstract

The energy absorbed by femtosecond laser plasma has nonlinear dependence on incident laser energy. The threshold power for plasma formation is 5.2 GW. Emission of nitrogen molecule, nitrogen molecule ion, atomic oxygen (unresolved triplet O I 777 nm) and nitrogen (triplet N I 742.4, 744.3 and 746.8 nm) lines is detected. Molecular emission consists of second positive and firs negative systems of nitrogen. Time-resolved spectroscopy of plasmas shows short molecular line emission (up to 1 ns) and long atomic line emission (up to 150 ns).

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A. A. Ilyin, S. S. Golik, and K. A. Shmirko "Absorption of laser radiation by femtosecond laser-induced plasma of air and its emission characteristics", Proc. SPIE 9680, 21st International Symposium Atmospheric and Ocean Optics: Atmospheric Physics, 96801Y (19 November 2015); https://doi.org/10.1117/12.2205791

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