| Numéro |
J. Phys. Colloques
Volume 44, Numéro C5, Octobre 1983
Interactions Laser-Solides, Recuits par Faisceaux d'Energie / Laser-Solid Interactions and Transient Thermal Processing of Materials
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| Page(s) | C5-77 - C5-78 | |
| DOI | https://doi.org/10.1051/jphyscol:1983511 | |
J. Phys. Colloques 44 (1983) C5-77-C5-78
DOI: 10.1051/jphyscol:1983511
INSTABILITY OF LIQUID METAL SURFACES UNDER INTENSE INFRARED IRRADIATION
F. KeilmannMax-Planck-Institut für Festkörperforschung, 7000 Stuttgart 80, F.R.G.
Résumé
Les surfaces de métaux liquides (Hg, In, Sn, Al, Pb) développent une structure périodique ondulée, causée par une irradiation infra-rouge de haute intensité. Cet effet est peut-être important pour l'interaction des lasers avec les métaux et plasmas.
Abstract
Liquid metal surfaces (Hg, In, Sn, Al, Pb) become periodically corrugated from the action of high intensity infrared radiation. The corrugation spacing equals the incident wavelength if normal incidence is used. The corrugation is shown to resonantly couple the incident field to surface plasmons. The latter, in turn, gives rise to spatially periodic heating and evaporation of the surface material which results in stimulated growth of the corrugation. A similar feedback process works for arbitrary angle of incidence. At a late state of the instability a transition occurs from the initially small (Fresnel) to a high absorption. This point may be of considerable interest to laser processing of metals and plasmas.