Effect of laser intensity on radio frequency emissions from laser induced breakdown of atmospheric air
Effect of laser intensity on radio frequency emissions from laser induced breakdown of atmospheric air
复制标题
激光强度对激光诱导大气击穿射频发射的影响
DOI：
10.1063/1.4953211
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发表时间：
2016
影响因子：
3.2
通讯作者：
P. P. Kiran
中科院分区：
文献类型：
--
作者：
L. Kumar;E. Manikanta;C. Leela;P. P. Kiran
通过改变激光聚焦几何形状，研究了输入激光强度对大气中纳秒 (ns) 和皮秒 (ps) 激光诱导击穿 (LIB) 射频 (RF) 发射（超过 30–1000MHz）的影响。当从紧聚焦条件转变为松聚焦条件时，观察到 ns 和 ps LIB 的射频发射分别减少和增加。发现 ns 和 ps LIB 的射频发射的角强度和径向强度与电偶极子辐射的 sin2θ/r2 依赖性一致。观察到归一化射频发射随入射激光强度 (Iλ2) 的变化而变化，表明中等输入激光强度下感应偶极矩的增加以及由于较高输入激光强度下等离子体复合率较高而导致的辐射阻尼。
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.
影响因子：
4.8
作者：
H. Nakajima;Y. Shimada;T. Somekawa;M. Fujita;K. Tanaka
通讯作者：
H. Nakajima;Y. Shimada;T. Somekawa;M. Fujita;K. Tanaka
使用激光诱导等离子体辐射微波的探地雷达
DOI：
--
发表时间：
2007
期刊：
IFSA2007 112
影响因子：
--
作者：
H. Nakajima;M. Yamaura;Y. Shimada;M. Fujita;and K. A. Tanaka
通讯作者：
and K. A. Tanaka
冰岛观测到的极光无线电发射和中频无线电波吸收
DOI：
--
发表时间：
2008
期刊：
Earth Plants Space 60
影响因子：
--
作者：
Sato;Y.;Ono;T.;Iizima;M.;Kumamoto;A.;Sato;N.;Kadokura;A.;and Miyaoka;H.
通讯作者：
H.