Percolation upon expansion of nanosecond-pulse-produced laser plasma into a gas

Spectral studies of a plasma expanding into the ambient gas upon ablation of various targets by nanosecond laser pulses of moderate intensities are performed. It is found that the dependences of the intensities of spectral lines on the pressure of the buffer gas and the target composition have a thr...

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Published inQuantum electronics (Woodbury, N.Y.) Vol. 35; no. 1; pp. 48 - 52
Main Authors Kask, Nikolai E, Michurin, Sergei V, Fedorov, Gennadii M
Format Journal Article
LanguageEnglish
Published United States IOP Publishing 31.01.2005
Subjects
ABLATION
ABSORPTION
BOILING POINTS
BUFFERS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DENSITY
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION
EXPANSION
LASER RADIATION
LASER TARGETS
LASER-PRODUCED PLASMA
METALS
PHYSICAL PROPERTIES
PLASMA
PLASMA EXPANSION
PULSES
RADIATIONS
SORPTION
TARGETS
THERMODYNAMIC PROPERTIES
THREE-DIMENSIONAL CALCULATIONS
TRANSITION TEMPERATURE
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Summary:Spectral studies of a plasma expanding into the ambient gas upon ablation of various targets by nanosecond laser pulses of moderate intensities are performed. It is found that the dependences of the intensities of spectral lines on the pressure of the buffer gas and the target composition have a threshold character typical of percolation. It is ascertained that a three-dimensional percolation occurs in plasma, and its threshold is determined by the atomic density of the metal component contained in the target. It is shown that percolation clusters, existing at temperatures higher than the boiling temperature of the target material, affect the plasma absorption ability, temperature, and spectral continuum of plasma emission. (interaction of laser radiation with matter. laser plasma)
ISSN:1063-7818
1468-4799
DOI:10.1070/QE2005v035n01ABEH002873