The Laser ablation of a metal foam: The role of electron–phonon coupling and electronic heat diffusivity

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.

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The role of melting temperature and electron-phonon coupling in the formation of clustered vacancy defects from heavy ion generated displacement cascades in Cu-Ni alloys

Scripta Metallurgica et Materialia ◽

10.1016/0956-716x(93)90370-8 ◽

1993 ◽

Vol 28 (7) ◽

pp. 879-884 ◽

Cited By ~ 7

Author(s):

D.K Tappin ◽

I.M Robertson ◽

M.A Kirk ◽

K Smalinskas

Keyword(s):

Melting Temperature ◽

Heavy Ion ◽

Phonon Coupling ◽

Vacancy Defects ◽

Displacement Cascades ◽

Ni Alloys ◽

Electron Phonon Coupling

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Electrons and Phonons in High Temperature Superconductors

Journal of Materials ◽

10.1155/2013/605929 ◽

2013 ◽

Vol 2013 ◽

pp. 1-4

Author(s):

Anu Singh ◽

Hempal Singh ◽

Vinod Ashokan ◽

B. D. Indu

Keyword(s):

Heat Capacity ◽

High Temperature ◽

Heat Transport ◽

Function Theory ◽

High Temperature Superconductors ◽

Phonon Coupling ◽

Electronic Heat Capacity ◽

Electron Phonon Coupling ◽

Electronic Heat ◽

Double Time

The defect-induced anharmonic phonon-electron problem in high-temperature superconductors has been investigated with the help of double time thermodynamic electron and phonon Green’s function theory using a comprehensive Hamiltonian which includes the contribution due to unperturbed electrons and phonons, anharmonic phonons, impurities, and interactions of electrons and phonons. This formulation enables one to resolve the problem of electronic heat transport and equilibrium phenomenon in high-temperature superconductors in an amicable way. The problem of electronic heat capacity and electron-phonon problem has been taken up with special reference to the anharmonicity, defect concentration electron-phonon coupling, and temperature dependence.

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Molecular Dynamics Simulations of Shocks Including Electronic Heat Conduction and Electron-Phonon Coupling

10.1063/1.1780222 ◽

2004 ◽

Cited By ~ 2

Author(s):

Dmitriy S. Ivanov

Keyword(s):

Molecular Dynamics ◽

Heat Conduction ◽

Molecular Dynamics Simulations ◽

Phonon Coupling ◽

Electron Phonon Coupling ◽

Electronic Heat ◽

Dynamics Simulations

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Influence of Electron-Phonon Coupling Coefficient on Properties in Femtosecond Laser Ablation

Materials Science Forum ◽

10.4028/www.scientific.net/msf.814.144 ◽

2015 ◽

Vol 814 ◽

pp. 144-149 ◽

Cited By ~ 1

Author(s):

Ran Xiang ◽

Xin Yu Tan ◽

Hui Li Wei

Keyword(s):

Laser Ablation ◽

Femtosecond Laser ◽

Electron Temperature ◽

Coupling Coefficient ◽

Femtosecond Laser Ablation ◽

High Energy ◽

Rapid Decline ◽

Phonon Coupling ◽

Electron Phonon Coupling ◽

Coupling Time

Thermodynamics effects generated by femtosecond laser ablation are very important. In this work, the numerical simulation of high-energy femtosecond laser ablation especially the electro-phonon coupling coefficient influence of high-energy femtosecond laser ablation on metal target was studied. A new two-temperature model (TTM) which considered the effects of electron density of states (DOS) on electron-phonon coupling coefficient was first established, then the temperature evolvement for electron and lattice in different electro-phonon coupling coefficient G, and the effect of G on electron temperature and lattice temperature and electron-phonon coupling time were emphatically analyzed. The results showed that the electron-phonon coupling coefficient strongly affected the surface electron temperature and coupling time in the femtosecond laser ablation. The smaller the electron-phonon coupling coefficient was, the more the energy transmission from electronic to ion subsystem. As a result, the smaller the value of electron-phonon coupling coefficient, a more rapid decline for the temperature of electronic sub-system achieved. This work will offer help for the future investigation of material fabrication by femtosecond laser ablation.

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