Time-resolved measurements of laser plasmas interaction during breakdown in normal atmosphere by various wavelengths

Alexey A. Il'in; Alexey V. Bulanov; Sergey S. Golik

doi:10.1117/12.753314

7 August 2007 Time-resolved measurements of laser plasmas interaction during breakdown in normal atmosphere by various wavelengths

Alexey A. Il'in, Alexey V. Bulanov, Sergey S. Golik

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Proceedings Volume 6735, International Conference on Lasers, Applications, and Technologies 2007: High-Power Lasers and Applications; 673514 (2007) https://doi.org/10.1117/12.753314
Event: International Conference on Lasers, Applications, and Technologies '07, 2007, Minsk, Belarus

Abstract

Time-resolved spatial and spectral characteristics of laser plasmas interaction in normal atmosphere are presented. Plasma experiments were performed by using 532 nm (4 ns, 180 mJ) and 1064 nm (5 ns, 360 mJ) pulses from Brilliant B Nd:YAG laser. Laser beams were focused in the opposite directions by lenses with focal distances of 15 mm. Firstly laser breakdown of air by 532 and 1064 nm laser radiation was investigated. Molecular bands, absorption line of atomic oxygen O 777 nm and dip of continuum intensity are recorded at initial instants of laser plasma formation. Mechanisms of plasma expansion are investigated. Relationship of molecular bands, absorption line of atomic oxygen, plasma's UV radiation and fast wave of ionization is discussed. Molecular bands, continuum and line temporal dynamics was investigated during laser plasmas interaction. Three zones of interaction and enhancement of line/continuum ratio is registered. Influence of KrF laser radiation (248 nm, 25 ns, 600 mJ) on parameters of breakdown induced by 532 nm laser radiation is discussed.

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Alexey A. Il'in, Alexey V. Bulanov, and Sergey S. Golik "Time-resolved measurements of laser plasmas interaction during breakdown in normal atmosphere by various wavelengths", Proc. SPIE 6735, International Conference on Lasers, Applications, and Technologies 2007: High-Power Lasers and Applications, 673514 (7 August 2007); https://doi.org/10.1117/12.753314

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KEYWORDS

Plasmas

Ionization

Ultraviolet radiation

Absorption

Oxygen

Black bodies

Nitrogen

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