Theoretical Models and Qualitative Interpretations of Fs Laser Material Processing

Nadezhda M. Bulgakova 1 Igor M. Burakov 1 Yuri Meshcheryakov 2 Razvan Stoian 3 Arkadi Rosenfeld 4 Ingolf V. Hertel 4
1 ITP - Institute of Thermophysics
2 IH - Institute of Hydrodynamics
3 LHC - Laboratoire Hubert Curien [Saint Etienne]
4 MBI - Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie
Abstract : In this paper a number of numerical models are presented which have been developed to describe the processes taking place at different time and length scales in different classes of materials under the irradiation by ultrashort laser pulses. A unified drift-diffusion approach for modeling chargecarrier transport in metals, semiconductors, and dielectrics allows to elucidate the dynamics of the electric field generated in the target due to photo-emission and to get insight into the origin of the Coulomb explosion process. The widely known two-temperature model is used to follow heating dynamics of irradiated matter and to analyze its phase transformations on the basis of thermodynamic concepts. Being modified for semiconductors, this model has allowed to establish the nature of high-energetic ion emission using laser pulse tailoring and to undertake a simplified modeling of consequences of ultrafast melting of silicon. A two-dimensional model of dielectric breakdown has made possible to uncover the mechanisms which enable the spatial modulation of the structures induced by temporally modulated laser pulses in wide-band-gap dielectric materials. A combined thermal/elasto-plastic model has provided a deep insight into the mechanisms and dynamics of the microbump and nanojet formation on nanosize gold films under femtosecond laser irradiation.
Keywords : ultrashort laser pulses drift-diffusion approach dielectric breakdown Coulomb explosion phase explosion ultrafast melting elasto-plastic modeling
Document type :
Journal articles
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https://hal-ujm.archives-ouvertes.fr/ujm-00140565
Contributor : Razvan Stoian <>
Submitted on : Friday, April 6, 2007 - 8:01:16 PM
Last modification on : Monday, August 5, 2019 - 5:18:15 PM

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  • HAL Id : ujm-00140565, version 1

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UNIV-ST-ETIENNE | LAHC | IOGS | PARISTECH

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Nadezhda M. Bulgakova, Igor M. Burakov, Yuri Meshcheryakov, Razvan Stoian, Arkadi Rosenfeld, et al.. Theoretical Models and Qualitative Interpretations of Fs Laser Material Processing. Journal of Laser Micro/Nanoengineering, Japan Laser Processing Society, 2007, 2 (1), pp.76. ⟨ujm-00140565⟩

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