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Mesoscopic modelling of enamel interaction with mid-infrared sub-ablative laser pulses

Vila Verde, AC; Ramos, MMD; Ribeiro, RM; Stoneham, AM; (2004) Mesoscopic modelling of enamel interaction with mid-infrared sub-ablative laser pulses. Thin Solid Films , 453-454 89 - 93. 10.1016/j.tsf.2003.11.082. Green open access

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Using a finite element approach the authors model the influence of enamel's microstructure and water distribution on the temperature and stress at the centre of the laser spot, for a CO2 laser working at 10.6 μm, with 0.35 μs pulse duration and sub-ablative intensity. The authors found that the distribution of water in enamel significantly influences the stress generated at the end of one laser pulse: much lower (two orders of magnitude) stress values occur in models with homogeneously distributed water than in models with 0.27 vol.% water located in pores or 4 vol.% in layers. The amount of water in enamel has a strong influence on the stress distribution, but not on the maximum stress values reached. However, different water contents do not influence the temperature distribution in enamel. These results suggest that adequate modelling of the ablation mechanisms in enamel, as in other highly inhomogeneous materials, must include their structure at the mesoscopic scale.

Title:Mesoscopic modelling of enamel interaction with mid-infrared sub-ablative laser pulses
Open access status:An open access version is available from UCL Discovery
Publisher version:http://dx.doi.org/10.1016/j.tsf.2003.11.082
Additional information:Text made available to UCL Discovery by kind permission of Elsevier B.V., 2012. Volumes 453-454, Pages 1-624 (1 April 2004). Special issue containing the Proceedings of Symposium H on Photonic Processing of Surfaces, Thin Films and Devices, of the E-MRS 2003 Spring Conference, Strasbourg, France. Edited by T.K. Lippert, D.B. Chrisey, I.W. Boyd and E. Millon
Keywords:Mesoscopic modelling, Laser ablation, Enamel, Finite element method, CO2 laser
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology

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