Heat transport analysis of femtosecond laser Ablation with full lagrangian modified molecular dynamics

Y. Yamashita, T. Yokomine, Shinji Ebara, A. Shimizu

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The purpose of this study is to analyze the heat transport mechanism of femtosecond laser ablation. Under the condition that laser pulse duration is on the order of femtoseconds, a thermal nonequilibrium state between an electron and atom exists and must be taken into account. In order to describe physical phenomena such as heat transport under a nonequilibrium state, a new method, modified molecular dynamics in which molecular dynamics (MD) couples with the two-temperature model (TTM) in a particle-based method, is proposed. In this method, MD simulates the motion of an atom and TTM simulates both electron heat conduction and energy exchange through electron-atom interactions. This approach yields the use of laser intensity as a parameter. For nonequilibrium heat transport, electron heat conduction transports most of the absorbed laser energy and becomes the dominant heat transport mechanism. At thermal equilibrium, above the ablation threshold fluence, electron heat conduction and thermal waves are dominant, while below the ablation threshold fluence, only electron heat conduction is dominant.

Original languageEnglish
Pages (from-to)627-646
Number of pages20
JournalInternational Journal of Thermophysics
Volume27
Issue number2
DOIs
Publication statusPublished - 2006 Mar 1
Externally publishedYes

Keywords

  • Heat transport mechanism
  • Laser ablation
  • Modified molecular dynamics
  • Two-temperature model

ASJC Scopus subject areas

  • Condensed Matter Physics

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