Nonlinearity and time-resolved studies of ion emission in ultrafast laser ablation of graphite |
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Authors: | A Kaplan M Lenner C Huchon R E Palmer |
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Institution: | (1) Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, UK |
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Abstract: | 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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Keywords: | PACS" target="_blank">PACS 79 20 Ds 64 70 Hz 68 35 Ja 78 47 +p |
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