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Proceedings Paper

Model of laser-induced material removal of polymers and gas dynamics
Author(s): Mirko Aden; David A. Wesner; Ernst-Wolfgang Kreutz; Reinhart Poprawe
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Paper Abstract

A model is built up to describe the effects of the laser- induced material removal of polymers and the dynamics of the volatile species. The heating and removal are described by the volume-heating of the irradiated polymer due to the absorption of laser radiation within the optical penetration depth and a phase transition from the condensed to the gas state of the polymer. The delivered energy due to the absorption of laser radiation is distributed to the different channels of decomposition in accordance to the temperature. The dynamics of the volatile species is calculated by the use of the Euler equations (non-dissipative continuum mechanical equations of the conservation laws of mass, momentum and energy). The flow field pattern of the gas phase (density, velocity, and pressure) during the material removal of PE, PP and PMMA and the depth of material removal per pulse are calculated. The maximum pressure for PMMA exceeds the one for PE, which exceeds the one of PP. This is attributed to the optical penetration depth of the three polymers. The depth of material removal increases with increasing fluence this effect is strongest for PP followed by PE and smallest for PMMA.

Paper Details

Date Published: 14 September 1998
PDF: 10 pages
Proc. SPIE 3343, High-Power Laser Ablation, (14 September 1998); doi: 10.1117/12.321529
Show Author Affiliations
Mirko Aden, Technical Univ. Aachen (Germany)
David A. Wesner, Fraunhofer-Institut fuer Lasertechnik (Germany)
Ernst-Wolfgang Kreutz, Technical Univ. Aachen (Germany)
Reinhart Poprawe, Technical Univ. Aachen and Fraunhofer-Institut fuer Lasertechnik (Germany)


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

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