Ultrafast pump-probe interferometry of femtosecond laser microplasma of multiple ionized gases

V. V. Bukin; S. V. Garnov; A. A. Malyutin; D. K. Sytchev; N. S. Vorobiev

doi:10.1117/12.729652

25 April 2007 Ultrafast pump-probe interferometry of femtosecond laser microplasma of multiple ionized gases

V. V. Bukin, S. V. Garnov, A. A. Malyutin, D. K. Sytchev, N. S. Vorobiev

Proceedings Volume 6606, Advanced Laser Technologies 2006; 660610 (2007) https://doi.org/10.1117/12.729652
Event: Advanced Laser Technologies 2006, 2006, Brasov, Romania

Abstract

The results of experimental studies of formation and evolution of a multiply ionized (multicharged) laser microplasma produced in gases (air, helium, nitrogen and argon) with high intensity ( I ~ 10¹⁷ W/cm² ) ultrashort (τ ~ 100 fs ) 800-nm laser pulses tightly focused in a region of diameter ~ 2-3 μm are presented. The measuring technique and experimental setup for generation and precise optical diagnostics of laser-induced plasma are described. The spatiotemporal distribution of the refractive index and the free electron density was studied by the interferometric pump-probe method with a spatial resolution of ~ 1.5 μm and a temporal resolution of ~ 100 fs. An almost complete ionization of the initial gas (down to the nuclei) was shown to occur even in the initial stage of gas plasma formation.

Citation Download Citation

V. V. Bukin, S. V. Garnov, A. A. Malyutin, D. K. Sytchev, and N. S. Vorobiev "Ultrafast pump-probe interferometry of femtosecond laser microplasma of multiple ionized gases", Proc. SPIE 6606, Advanced Laser Technologies 2006, 660610 (25 April 2007); https://doi.org/10.1117/12.729652

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