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Effect of Energy Deposition Modes on Ultrafast Solid-Liquid-Vapor Phase Change of a Thin Gold Film Irradiated by a Femtosecond Laser

[+] Author Affiliations
Jing Huang, Yuwen Zhang, J. K. Chen

University of Missouri, Columbia, MO

Mo Yang

University of Shanghai for Science and Technology, Shanghai, China

Paper No. IHTC14-23050, pp. 463-472; 10 pages
doi:10.1115/IHTC14-23050
From:
  • 2010 14th International Heat Transfer Conference
  • 2010 14th International Heat Transfer Conference, Volume 6
  • Washington, DC, USA, August 8–13, 2010
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4941-5 | eISBN: 978-0-7918-3879-2
  • Copyright © 2010 by ASME

abstract

Effects of different parameters on the melting, vaporization and resolidification processes of thin gold film irradiated by a femtosecond pulse laser are 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 include 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 are discussed based on the simulation results.

Copyright © 2010 by ASME
Topics: Vapors , Lasers

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