Femtosecond laser optical gas breakdown microplasma: the ionisation and postionisation dynamics

Journal Article · Wed Oct 31 00:00:00 EDT 2007 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2007V037N10ABEH013646· OSTI ID:21466737

Bukin, V V; Garnov, S V; Malyutin, A A; Strelkov, V V ^[1]

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1. A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)

The formation and evolution dynamics of the laser plasma produced in the microvolumes of gases (air, nitrogen, argon, and helium) upon their multiple ionisation by high-intensity (4x10{sup 16} W cm{sup -2}) tightly focused (to a region 1.7 {mu}m in diameter) 400-nm, 100-fs second-harmonic pulses from a Ti:sapphire laser is studied. The spatiotemporal distribution profiles of the refractive index and electron microplasma density were recorded by ultrahigh-speed interferometry. The postionisation of a femtosecond laser plasma, i.e. the growth of the electron density known after the end of the exciting laser pulse, is detected for the first time. A theoretical model is proposed, which describes the mechanism of plasma postionisation by hot photoelectrons. The results of electron density calculations are in good agreement with experimental data. (special issue devoted to the 25th anniversary of the a.m. prokhorov general physics institute)

• OSTI ID: 21466737
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Vol. 37, Issue 10; Other Information: DOI: 10.1070/QE2007v037n10ABEH013646; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AIR
ARGON
BREAKDOWN
ELECTRON DENSITY
EXPERIMENTAL DATA
HELIUM
INTERFEROMETRY
IONIZATION
LASER-PRODUCED PLASMA
NITROGEN
PLASMA DENSITY
PULSES
REFRACTIVE INDEX
SAPPHIRE
CORUNDUM
DATA
ELEMENTS
FLUIDS
GASES
INFORMATION
MINERALS
NONMETALS
NUMERICAL DATA
OPTICAL PROPERTIES
OXIDE MINERALS
PHYSICAL PROPERTIES
PLASMA
RARE GASES