Analytical solution for electron and lattice site temperatures due to laser-induced non-equilibrium energy transport in metals

2010 ◽  
Vol 88 (7) ◽  
pp. 479-491 ◽  
Author(s):  
Hind M. Al-Theeb ◽  
Bekir S. Yilbas
Keyword(s):  
Experimental Data ◽  
Analytical Solutions ◽  
Energy Transport ◽  
Short Pulse ◽  
Substrate Material ◽  
Theory Approach ◽  
Short Pulse Laser ◽  
Numerical Predictions ◽  
Temperature Distributions ◽  
Pulse Laser Heating

The present study describes the modeling of short-pulse laser heating of gold and copper materials. The energy transport due to a laser short pulse is formulated using the electron kinetic theory approach. Electron and lattice temperature distributions inside the substrate material during the laser short pulse are formulated analytically. In the analysis, the Laplace transformation technique is used. The results obtained from the analytical solutions are compared with numerical predictions and experimental data. It is found that the results obtained from the numerical and analytical solutions for temperature distributions are in good agreement with the experimental data.

Laser short-pulse heating with time-varying intensity and thermal stress development in the lattice subsystem

2005 ◽  
Vol 219 (1) ◽  
pp. 73-81 ◽  
Author(s):  
B S Yilbas ◽  
A F M Arif
Keyword(s):  
Thermal Stress ◽  
Lattice Site ◽  
Energy Transport ◽  
Pulse Heating ◽  
Short Pulse ◽  
High Stress ◽  
Surface Region ◽  
Substrate Material ◽  
Temperature Gradients ◽  
Stress Levels

Laser short-pulse heating of solid surfaces results in non-equilibrium energy transport in the region irradiated by the laser beam. Owing to the large temperature gradients in the lattice subsystem, high stress levels develop in the surface region of the substrate material. In the present study, temperature and stress fields in the substrate material are presented for the case of the laser short-pulse heating of gold. Electron kinetic theory and a two-equation heating model are introduced to account for non-equilibrium energy transport during the laser heating pulse. Laser pulses exponentially decaying with time are accommodated in the simulations. It is found that lattice site temperature gradients attain high values inspite of the low magnitude of the lattice site temperature. This, in turn, results in high stress levels in the surface region of the substrate material. Thermal stress is compressive owing to high thermal strain development and low displacement of the surface.

scholarly journals Numerical Modeling of Melting Process of Thin Metal Films Subjected to the Short Laser Pulse

2012 ◽  
Vol 12 (4) ◽  
pp. 105-108 ◽  
Author(s):  
E. Majchrzak ◽  
J. Dziatkiewicz
Keyword(s):  
Short Pulse ◽  
Melting Process ◽  
Thin Metal Film ◽  
Thin Metal ◽  
Spatial Evolution ◽  
Temperature Model ◽  
Short Pulse Laser ◽  
Temporal And Spatial ◽  
Pulse Laser Heating ◽  
Two Temperature

Abstract Thin metal film subjected to a short-pulse laser heating is considered. The parabolic two-temperature model describing the temporal and spatial evolution of the lattice and electrons temperatures is discussed and the melting process of thin layer is taken into account. At the stage of numerical computations the finite difference method is used. In the final part of the paper the examples of computations are shown.

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