We offer to your attention a preprint “Numerical investigation of the influence of finite sample thickness on laser ablation of materials” P11-2022-32 published by the JINR Publishing Department. The authors are Ilkizar Amirkhanov, et al.

In previous works, the authors carried out numerical simulations of laser ablation of materials that occurs under the action of ultrashort laser pulses in semi-constrained samples.

The authors carried out a similar numerical study in samples of a finite size in the present work. The action of the laser is taken into account through the source functions in the heat conduction equation, setting the coordinate and time dependences of the laser source. During laser ablation of the material, the thickness of the sample changes. By passing to the moving coordinate system, the problem with moving boundaries is transferred to the problem with fixed boundaries. In this case, in the heat conduction equation, along with the diffusion term, a convective heat transfer term arises.

In the formulation of the problem by the authors, the variable thickness of the sample affects not only the convective term, but it affects the diffusion term, the source functions, and the boundary conditions of the heat equation. These influences are visible from the mathematical formulation of the problem itself.

The research has been performed at the Meshcheryakov Laboratory of Information Technologies JINR.

Read the full version (in Russian)