Laser plasma plume structure and dynamics in the ambient air: The early stage of expansion

Laser ablation plasma plume expanding into the ambient atmosphere may be an efficient way to produce nanoparticles. From that reason it would be interesting to study the properties of these laser induced plasmas formed under conditions that are known to be favorable for nanoparticles production. In...

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Bibliographic Details
Published in:Journal of applied physics 2011-05, Vol.109 (10), p.103301-103301-17
Main Authors: Cirisan, M., Jouvard, J. M., Lavisse, L., Hallo, L., Oltra, R.
Format: Article
Language:English
Subjects:
ABLATION
ABSORPTION
ALUMINIUM
AMBIENT TEMPERATURE
COMPUTERIZED SIMULATION
DENSITY
ELECTROMAGNETIC RADIATION
ELECTRON TEMPERATURE
ELEMENTS
EXPANSION
ION TEMPERATURE
IRON
LASER RADIATION
LIGHT TRANSMISSION
MATERIALS SCIENCE
METALS
NANOSCIENCE AND NANOTECHNOLOGY
NANOSTRUCTURES
PHYSICAL PROPERTIES
Physics
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLUMES
PULSES
RADIATIONS
SIMULATION
SOLIDS
SORPTION
SURFACES
TITANIUM
TRANSITION ELEMENTS
TRANSMISSION
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Summary:Laser ablation plasma plume expanding into the ambient atmosphere may be an efficient way to produce nanoparticles. From that reason it would be interesting to study the properties of these laser induced plasmas formed under conditions that are known to be favorable for nanoparticles production. In general, plume behavior can be described as a two-stage process: a "violent" plume expansion due to the absorption of the laser beam energy (during the laser pulse) followed by a fast adiabatic expansion in the ambient gas (after the end of the laser pulse). Plasma plume may last a few microseconds and may have densities 10 −6 times lower than the solid densities at temperatures close to the ambient temperature. Expansion of the plasma plume induced by the impact of a nanosecond laser beam ( λ =1064 nm) on the surface of metallic samples in the open air has been investigated by means of fast photography. Spatio-temporal evolution of the plume at the early stage of its expansion (first 330 ns) has been recorded. Structure and dynamics of the plasma plume have been investigated and compared to numerical simulations obtained with a hydro-code, as well as some scaling laws. In addition, measurements using different sample materials (Al, Fe, and Ti) have been performed in order to analyze the influence of target material on plume expansion.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3581076