Review of ablation processes at and above the classical threshold

Heinrich Hora; Frederick Osman; Reynaldo Castillo

doi:10.1117/12.321576

14 September 1998 Review of ablation processes at and above the classical threshold

Heinrich Hora, Frederick Osman, Reynaldo Castillo

Proceedings Volume 3343, High-Power Laser Ablation; (1998) https://doi.org/10.1117/12.321576
Event: High-Power Laser Ablation, 1998, Santa Fe, NM, United States

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.

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Heinrich Hora, Frederick Osman, and Reynaldo Castillo "Review of ablation processes at and above the classical threshold", Proc. SPIE 3343, High-Power Laser Ablation, (14 September 1998); https://doi.org/10.1117/12.321576

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KEYWORDS

Plasma

Ions

Picosecond phenomena

Electrons

Laser damage threshold

Laser ablation

Laser applications

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