Simulation of thermal processes in materials under the action of laser pulses
Publications, 22 November 2022
We offer to your attention a preprint “Simulation of thermal processes appearing in materials under the action of laser pulses within the hyperbolic thermal peak model” P11-2022-31 published by the JINR Publishing Department. The authors are Ilkizar Amirkhanov, Ibrohim Sarkhadov, Zafar Tukhliev.
The authors propose a modification of the thermal spike model (TSM) based on a system of two coupled hyperbolic heat conduction equations. The action of the laser in the electron gas is taken into account through the source function, which was chosen in the form of a double femtosecond laser pulse.
In the hyperbolic TSM, in contrast to the parabolic TSM, there are additional parameters that characterise the relaxation times of the heat flux in the electron gas and the crystal lattice. In addition, there are additional terms in the sources of the hyperbolic TSM — derivatives from the sources of parabolic equations and from the temperatures difference between the electron gas and the crystal lattice. This means that the temperatures of the electron gas and the crystal lattice are influenced not only by the sources, but also by their rates of change.
The hyperbolic TSM equations are linear assuming that the thermophysical parameters of the sample material are independent of temperatures. Using this property of the equations in the present work, the contributions of each term of the common source in the electron gas to the temperatures of the electron gas and the crystal lattice are established.
The article has been sent to the Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques.
The research has been performed at the Meshcheryakov Laboratory of Information Technologies JINR.