Abstract
Melting, vaporization and resolidification processes of thin gold film irradiated by a femtosecond pulse laser are studied numerically. The nonequilibrium heat transfer in electrons and lattice is described using a two-temperature model. The solid–liquid interfacial velocity, as well as elevated melting temperature and depressed solidification temperature, is obtained by considering the interfacial energy balance and nucleation dynamics. An iterative procedure based on energy balance and gas kinetics law to track the location of liquid–vapor interface is utilized to obtain the material removal by vaporization. The effect of surface heat loss by thermal radiation was discussed. The influences of laser fluence and duration on the evaporation process are studied. Results show that higher laser fluence and shorter laser pulse width lead to higher interfacial temperature, deeper melting and ablation depths.
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Huang, J., Zhang, Y. & Chen, J.K. Ultrafast solid–liquid–vapor phase change of a gold film induced by pico- to femtosecond lasers. Appl. Phys. A 95, 643–653 (2009). https://doi.org/10.1007/s00339-009-5156-8
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DOI: https://doi.org/10.1007/s00339-009-5156-8