Transient effects in pulsed laser irradiation

Theoretical analysis of the influence of the temporal profile (rectangular, triangular, Gaussian) of the laser pulse on heating/cooling and phase transition velocities and quantity of ablated material was performed on the basis of a multifront Stephan problem. Modeling showed that material removal u...

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Bibliographic Details
Published inApplied surface science Vol. 253; no. 19; pp. 7744 - 7748
Main Authors Mazhukin, V.I., Lobok, M.G., Smurov, I.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 31.07.2007
Subjects
Laser evaporation
Laser melting
Laser pulse shape
Laser pulse shape
79.20.Ds
42.62.−b
Laser evaporation
Laser melting
64.70.Dv
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Summary:Theoretical analysis of the influence of the temporal profile (rectangular, triangular, Gaussian) of the laser pulse on heating/cooling and phase transition velocities and quantity of ablated material was performed on the basis of a multifront Stephan problem. Modeling showed that material removal under stationary conditions (that correspond to long pulses) is entirely controlled by specific heat and material density, while in the case of transient regimes (short pulses) thermal conductivity and heat capacity play a predominant role. Interaction of the melting and evaporation fronts characterized by an evaporation front velocity far exceeding the melting front one is one of the examples of the transient nature of the phenomena influenced by the laser pulse parameters.
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ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2007.02.086