Al Target Temperature Characteristics by Laser Ablation and its Plume Expansion

The thermal coupling between laser and matter has always been a hot topic. The temperature characteristics of aluminum target irradiated by pulsed laser and the target vapor plume ejection were studied. The heat conduction equation was used to describe the temperature change characteristics of Al target irradiated by laser. The mass conservation equation and momentum conservation equation were used to describe the temperature and density of melted fluid. The mass conservation equation was used to describe the density and velocity characteristics of vapor after gasification. The simulation results showed that the target temperature raised and the liquid and vapor phases changed due to the laser irradiation. The model considered the thermal convection effect caused by the liquefaction flow of target material, and the physical model can describe the temperature change of metal target under laser irradiation. The phase change of solid target was obtained by setting the phase indicator, and the process of target steam injection was analyzed. The physical model can be used to analyze the thermal coupling of laser-matter interaction, thus laying a theoretical foundation for the study of laser-matter interaction.