Nonlinearity and time-resolved studies of ion emission in ultrafast laser ablation of graphite

被引：0
|
作者：
A. Kaplan
M. Lenner
C. Huchon
R. E. Palmer
机构：
[1] University of Birmingham,Nanoscale Physics Research Laboratory, School of Physics and Astronomy
来源：
Applied Physics A | 2008年 / 92卷
关键词：
79.20.Ds; 64.70.Hz; 68.35.Ja; 78.47.+p;
D O I：
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学科分类号：
摘要：
We have investigated the laser fluence dependence of the ion emission process in ultrafast laser ablation of graphite using a time-of-flight technique. Two regimes of ion emission have been identified: (1) a highly nonlinear laser absorption process accompanied by generation of a transient electrical field on the surface and collisionless emission of ions due to electrostatic repulsion; (2) a saturation regime for laser power absorption characterised by nearly equal kinetic energy of ejected carbon clusters. We also show the effect of the surface temperature on the emitted clusters’ stability and the influence of nonlinearity on the intensity autocorrelation traces.
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页码：999 / 1004
页数：5
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