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Proceedings Paper

Capillary Waves And Energy Coupling In Laser Materials Processing
Author(s): A. Gasser; G. Herziger; B. Holtgen; E. W. Kreutz; H. G. Treusch
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Paper Abstract

Static and dynamic measurements of the incident laser power, of the diffuse and specular reflected power have been performed in order to determine the absorption behavior of various metals and semiconductors during the interaction with powerful CO2-and Nd:YAG-laser-radiation. The absorptivity of the vapor and laser-induced plasma was probed by high-speed photography and measurements of conductivity transients as a function of intensity, composition, and pressure of the ambient atmosphere. For I<Iv the intensity-independent energy coupling is given by the temperature-dependent refractive index and absorption coefficient of matter. For I>IB the intensity-dependent energy coupling is governed by the generation of photon-induced plasma in the surface region in combination with the dynamics of the molten and vaporized material within the interaction zone giving in addition indication for capillary waves.

Paper Details

Date Published: 22 September 1987
PDF: 8 pages
Proc. SPIE 0801, High Power Lasers: Sources, Laser-Material Interactions, High Excitations, and Fast Dynamics, (22 September 1987); doi: 10.1117/12.941238
Show Author Affiliations
A. Gasser, Fraunhofer-Institut fUr Lasertechnik (Germany)
G. Herziger, Lehrstuhl fur Lasertechnik (Germany)
B. Holtgen, Fraunhofer-Institut fur Lasertechnik (Germany)
E. W. Kreutz, Lehrstuhl fur Lasertechnik (Germany)
H. G. Treusch, Fraunhofer-Institut fur Lasertechnik (Germany)

Published in SPIE Proceedings Vol. 0801:
High Power Lasers: Sources, Laser-Material Interactions, High Excitations, and Fast Dynamics
Ernst-Wolfgang Kreutz; A. Quenzer; Dieter Schuoecker, Editor(s)

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