Abstract
In this paper, we report a numerical simulation of laser ablation of a material by ultrashort laser pulses. The thermal mechanism of laser ablation is described in terms of a one-dimensional nonstationary heat conduction equation in a coordinate system associated with a moving evaporation front. The laser action is taken into account through the functions of the source in the thermal conductivity equation that determine the coordinate and time dependence of the laser source. For a given dose of irradiation of the sample, the profiles of the sample temperature at different times, the dynamics of the displacement of the sample boundary due to evaporation, the velocity of this boundary, and the temperature of the sample at the moving boundary are obtained. The dependence of the maximum temperature on the sample surface and the thickness of the ablation layer on the radiation dose of the incident laser pulse is obtained. Numerical calculations were performed using the finite difference method. The obtained results agree with the results of other works obtained by their authors.
Highlights
In recent years, pulsed laser ablation [1]–[3] of various materials has attracted more and more interest from the point of view of fundamental study of processes in matter under extreme conditions of ultrafast energy supply
Numerical modeling of laser ablation of materials was carried out based on the heat conduction equation written in a moving coordinate system associated with the evaporation front, with initial and boundary conditions [2]:
T = T0; h = ∫ v(t)dt, Ts = T (0, t), where c(T ), λ(T ), ρ(T ) are the specific heat, thermal conductivity and density of the material at the temperature T (z, t), h(t), respectively is the depth of the crater on the surface of the sample at time t, zm is the maximum distance, v(Ts) is the velocity of the boundary displacement due to evaporation, Lev is the specific heat of sublimation
Summary
In recent years, pulsed laser ablation [1]–[3] (any process of laser-stimulated removal of matter, including the emission of electrons) of various materials has attracted more and more interest from the point of view of fundamental study of processes in matter under extreme conditions of ultrafast energy supply. This implies constructing a new physical theory describing strongly nonlinear effects. The required work is presented in a more extended form
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