Kinetic Theory Analysis of Laser Ablation of Carbon

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Abstract:

The paper presents a model of ablation of carbon by a nanosecond laser pulse that considers the kinetics of the process. The model approximates the process as sublimation and combines conduction heat transfer in the target with the gas dynamics of the ablated plume which are coupled through the boundary conditions at the interface. The ablated mass flux and the temperature of the ablating material are obtained from the conservation relations at the interface derived from the momentum solution of the Boltzmann equation for arbitrary strong evaporation. The effects of laser intensity and ambient pressure on the ablated mass flux and parameters of vapor plume are studied. It is shown that most of the time the ablation rate is restricted by the kinetic theory limitation on the maximum mass flux that can be attained in a phase-change process. This fact makes the model tolerant of possible inaccuracies in calculating the saturation pressure of carbon vapor.

Keywords: CARBON; EVAPORATION; KINETIC THEORY; LASER ABLATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2008.003

Publication date: July 1, 2008

More about this publication?
  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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