Improved two-temperature model including electron density of states effect for Ni during femtosecond laser pulses

Ranran Fang; Hua Wei; Xiaojing Gui

doi:10.1117/12.918381

13 March 2012 Improved two-temperature model including electron density of states effect for Ni during femtosecond laser pulses

Ranran Fang, Hua Wei, Xiaojing Gui

Author Affiliations +

Proceedings Volume 8330, Photonics and Optoelectronics Meetings (POEM) 2011: Laser and Terahertz Science and Technology; 83300P (2012) https://doi.org/10.1117/12.918381
Event: Photonics and Optoelectronics Meetings 2011, 2011, Wuhan, China

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.

Citation Download Citation

Ranran Fang, Hua Wei, and Xiaojing Gui "Improved two-temperature model including electron density of states effect for Ni during femtosecond laser pulses", Proc. SPIE 8330, Photonics and Optoelectronics Meetings (POEM) 2011: Laser and Terahertz Science and Technology, 83300P (13 March 2012); https://doi.org/10.1117/12.918381

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