Effect of laser intensity on radio frequency emissions from laser induced breakdown of atmospheric air

The studies on the effect of input laser intensity, through the variation of laser focusing geometry, on radio frequency (RF) emissions, over 30–1000 MHz from nanosecond (ns) and picosecond (ps) laser induced breakdown (LIB) of atmospheric air are presented. The RF emissions from the ns and ps LIB w...

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Bibliographic Details
Published in:Journal of applied physics 2016-06, Vol.119 (21)
Main Authors: Vinoth Kumar, L., Manikanta, E., Leela, Ch, Prem Kiran, P.
Format: Article
Language:English
Subjects:
AIR
Applied physics
AUGMENTATION
BREAKDOWN
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DAMPING
Dependence
DIPOLE MOMENTS
ELECTRIC DIPOLES
EMISSION
FOCUSING
GEOMETRY
Laser induced breakdown
LASERS
MHZ RANGE
PLASMA
Radio frequency
RADIOWAVE RADIATION
RECOMBINATION
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Summary:The studies on the effect of input laser intensity, through the variation of laser focusing geometry, on radio frequency (RF) emissions, over 30–1000 MHz from nanosecond (ns) and picosecond (ps) laser induced breakdown (LIB) of atmospheric air are presented. The RF emissions from the ns and ps LIB were observed to be decreasing and increasing, respectively, when traversed from tight to loose focusing conditions. The angular and radial intensities of the RF emissions from the ns and ps LIB are found to be consistent with sin2θ/r2 dependence of the electric dipole radiation. The normalized RF emissions were observed to vary with incident laser intensity (Iλ2), indicating the increase in the induced dipole moment at moderate input laser intensities and the damping of radiation due to higher recombination rate of plasma at higher input laser intensities.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4953211