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Proceedings Paper

Review of ablation processes at and above the classical threshold
Author(s): Heinrich Hora; Frederick Osman; Reynaldo Castillo
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Paper Abstract

For the use of laser ablation from solid materials, laser intensities I in the range of few orders of magnitudes above or below 1010 Watts/cm2 are of interest. Though these are of a modest magnitude it is known from the very beginning of laser plasma interaction studies that the ablation process mostly is not following the simple gasdynamic (thermokinetic) heating and hydrodynamic plasma mechanisms but that most complicated phenomena appear which are in the focus of research since their first observations in 1962 by Linlor and Honig. A number of basically new nonlinear mechanisms were discovered including the nonlinear (ponderomotive) force, emission of different groups of plasma where the fast ions show a separation by energy linearly increasing on their ion charge number Z, ponderomotive and relativistic self focusing, generation of higher harmonics in the backscattered radiation, double layer and surface tension effects, parametric instabilities and a stochastic pulsation of the interaction within some ten picoseconds. This all seems to have a threshold of about 1 MW laser power at least if beams of up to 100 wavelength diameter are being used. For the applications of the ablation mechanisms it may well be that further anomalous mechanisms may be discovered with the very wide beams. In order to simulate the awareness of these complexities, this paper is presenting a new and updated synopsis on the anomalous nonlinear mechanisms whose knowledge seems to be settled at present.

Paper Details

Date Published: 14 September 1998
PDF: 11 pages
Proc. SPIE 3343, High-Power Laser Ablation, (14 September 1998); doi: 10.1117/12.321576
Show Author Affiliations
Heinrich Hora, Univ. New South Wales (Australia)
Frederick Osman, Univ. Western Sydney Macarthur (Australia)
Reynaldo Castillo, Univ. Western Sydney Macarthur (Australia)

Published in SPIE Proceedings Vol. 3343:
High-Power Laser Ablation
Claude R. Phipps, Editor(s)

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