Numerical Modeling For Ablation Of Absorbing
Dielectrics
Author(s)
S.George & K.Mitra
Abstract
This paper discusses the ablation phenomena in absorbing dielectrics due to ultra
short pulses for potential applications in the field of material processing. The
numerical model is based on multi-photon absorption followed by thermal
degradation and diffusion. The wave nature of the propagating laser source,
which has a temporal Gaussian distribution, is incorporated by considering the
transient radiative transport equation. The mathematical formulation takes into
consideration the saturation effects within the framework of two or three level
systems of the electronic structure of chromophores. This involves solving a set
of coupled rate equations, heat diffusion equation, and the transient radiative
transport equation using two different schemes - a fully implicit iterative
technique and a predictor corrector techn
Keywords
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