The Influence of DOS Effects on Ablation Properties in High Energy Femtosecond Laser Ablation Process

Abstract:

The numerical simulation of high-energy femtosecond laser ablation on metal target is studied in this paper. Based on the two-temperature model (TTM), a new model considering the effects of the electron density of states (DOS) on electronic heat capacity, electron-phonon coupling coefficient and electronic thermal conductivity is established. As an example of gold target, the relationship between the melting threshold and the thickness of gold films is numerically calculated. Our result is more consistent with the experimental datum in contrast to the results without considering the DOS effects. This shows that the revised TTM of high-energy femtosecond laser ablation (i.e. DOS-TTM) is more reasonable compared with general used TTM.

• Periodical: Materials Science Forum (Volume 689)
• Pages: 11-15
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.689.11
• Online since: June 2011
• Authors: Hui Li Wei, Feng Mao, Xin Yu Tan, Xiang Ping Huang, Zhao Wang, Hui Jin Xu, Chang Yuan Zhang, Jia Yi
• Keywords: DOS Effect, Electron Thermal Conductivity, Electronic Density of States, Femtosecond Laser Ablation

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