| Autor: |
Vinoth Kumar, L., Manikanta, E., Leela, Ch., Prem Kiran, P. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 2016, Vol. 119 Issue 21, p214904-1-214904-8, 8p, 1 Chart, 6 Graphs |
| Abstrakt: |
The studies on the effect of input laser intensity, through the variation of laser focusing geometry, on radio frequency (RF) emissions, over 30-1000MHz 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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