Abstract
Effects of different parameters on the melting, vaporization and resolidification processes of thin gold film irradiated by femtosecond pulses and pulse train were systematically studied. The classical two-temperature model was adopted to depict the non-equilibrium heat transfer in electrons and lattice. The melting and resolidification processes, which was characterized by the solid-liquid interfacial velocity, as well as elevated melting temperature and depressed solidification temperature, was obtained by considering the interfacial energy balance and nucleation dynamics. Vaporization process which leads to ablation was described by tracking the location of liquid-vapor interface with an iterative procedure based on energy balance and gas kinetics law. The parameters in discussion included film thickness, laser fluence, pulse duration, pulse number, repetition rate, pulse train number, etc. Their effects on the maximum lattice temperature, melting depth and ablation depth were discussed based on the simulation results.
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Dr. Yuwen Zhang is a Professor in the Department of Mechanical and Aerospace Engineering at University of Missouri. His research interests are in the areas of thermalfluids science and engineering, including ultrafast and high-energy laser materials interaction, multiscale transport phenomena in multiphase systems, inverse problems and optimization under uncertainty, micro- and nanoscale heat transfer, and sustainable and renewable energy. His research has been funded by the Office of Naval Research, Air Force Research Laboratory, Army Program Executive Office, and National Science Foundation (NSF), as well as the National Natural Science Foundation of China. He is author of two books, 150 journal articles, and more than 100 conference papers. His innovative works have earned him many awards including the 2002 Young Investigator Award from the Office of Naval Research and the 2010 Chancellor’s Award for Outstanding Research and Creative Activity from the University of Missouri. Professor Zhang has been awarded a 2008 Chang Jiang Chair Professorship by the Ministry of Education of China.
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Huang, J., Zhang, Y., Chen, J.K. et al. Ultrafast solid-liquid-vapor phase change of a thin gold film irradiated by femtosecond laser pulses and pulse trains. Front. Energy 6, 1–11 (2012). https://doi.org/10.1007/s11708-012-0179-9
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DOI: https://doi.org/10.1007/s11708-012-0179-9