Thermal fields in multimode laser-metallic thin film interaction

摘要

In the present paper we are dealing with the thermal fields for laser-metallic thin film interaction. We propose a simplified model which takes into account just one global heat equation instead of two couple heat equations. For the parameters which are the same order of magnitude we take into account just the thermal coefficients of the substrate. The idea of our model is to consider an absorption coefficient as close as possible to reality. We solve the heat equation using the integral transform technique. We plot the thermal field at the interface for different situations. Our results indicate that: (i) the thermal field depends strongly on the absorption coefficient of the thin film and (ii) the length of the interface, at least in the domain 0.1-10 μm does not play an important role in the thermal fields. Specific results are presented for a laser beam operating in the mode TEM01.