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Proceedings Paper

Improved two-temperature model including electron density of states effect for Ni during femtosecond laser pulses
Author(s): Ranran Fang; Hua Wei; Xiaojing Gui
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Paper Abstract

Electron-phonon coupling factor and electron heat capacity based on the electron density of states are investigated for transition metal Ni under femtosecond laser irradiation. The thermal excitation of d band electrons is found to result in large deviations from the commonly used approximations of linear temperature dependence of the electron heat capacity and the constant electron-phonon coupling factor. Results of the simulations performed with the two-temperature model demonstrate that the electron-phonon relaxation time becomes long for high fluence laser for Ni. The satisfactory agreement between our numerical results and experimental data of threshold fluence indicates that the electron temperature dependence of the thermophysical parameters accounting for the thermal excitation of d band electrons should not be neglected under the condition that electron temperature is higher than 104 K.

Paper Details

Date Published: 14 March 2012
PDF: 10 pages
Proc. SPIE 8330, Photonics and Optoelectronics Meetings (POEM) 2011: Laser and Terahertz Science and Technology, 83300P (14 March 2012); doi: 10.1117/12.918381
Show Author Affiliations
Ranran Fang, Chongqing Univ. of Posts and Telecommunications (China)
Hua Wei, Chongqing Univ. (China)
Xiaojing Gui, Chongqing Univ. of Posts and Telecommunications (China)


Published in SPIE Proceedings Vol. 8330:
Photonics and Optoelectronics Meetings (POEM) 2011: Laser and Terahertz Science and Technology
Jianquan Yao; X. C. Zhang; Dapeng Yan; Jinsong Liu, Editor(s)

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