Ablation study in gold irradiated by single femtosecond laser pulse with electron temperature dependent interatomic potential and electron–phonon coupling factor

Laser Physics ◽  
2021 ◽  
Vol 31 (3) ◽  
pp. 036002
Author(s):  
Weirong Yuan ◽  
Tatyana Sizyuk
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Electron Temperature ◽  
Femtosecond Laser Pulse ◽  
Interatomic Potential ◽  
Coupling Factor ◽  
Phonon Coupling ◽  
Temperature Dependent ◽  
Electron Phonon Coupling ◽  
Ablation Study

Influence of Inter- and Intraband Transitions to Electron Temperature Decay in Noble Metals After Short-Pulsed Laser Heating

2010 ◽  
Vol 132 (12) ◽  
Author(s):  
Patrick E. Hopkins
Keyword(s):  
Heat Capacity ◽  
Electron Temperature ◽  
Noble Metals ◽  
Coupling Factor ◽  
Phonon Coupling ◽  
Electron Heat Capacity ◽  
Temperature Decay ◽  
Electron Heat ◽  
Electron Phonon Coupling ◽  
Pulsed Laser Heating

This work examines the effects of photonically induced interband excitations from the d-band to states at the Fermi energy on the electron temperature decay in noble metals. The change in the electron population in the d-band and the conduction band causes a change in electron heat capacity and electron-phonon coupling factor. In noble metals, due to the large d-band to Fermi energy separation, the contributions to electron heat capacity and electron-phonon coupling factor of intra- and interband transitions can be separated. The two temperature model describing electron-phonon heat transfer after short-pulsed laser heating is solved using the expressions for heat capacity and electron-phonon coupling factor after intra- and interband excitations, and the predicted electron temperature change of the intra- and interband excited electrons are examined. A critical fluence value is defined that represents the absorbed fluence needed to fill all available states at a given photon energy above the Fermi level. At high absorbed laser fluences and pulse energies greater than the interband transition threshold, the interband and intraband contributions to thermophysical properties differ and are shown to affect temporal electron temperature profiles.

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

2015 ◽  
Vol 814 ◽  
pp. 144-149 ◽  
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.

scholarly journals Non-equilibrium two-dimensional thermal evolutions in target materials irradiated by femtosecond laser pulse

2013 ◽  
Vol 32 (1) ◽  
pp. 33-39 ◽  
Author(s):  
G. Al-Malkawi ◽  
A. Hassanein
Keyword(s):  
Heat Transfer ◽  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse ◽  
Thermal Evolution ◽  
Temporal Distribution ◽  
Spot Size ◽  
Coupling Factor ◽  
Two Dimensional ◽  
Non Equilibrium

AbstractNon-equilibrium heat transfer described by a two-step temperature model was developed to study the thermal evolution through target materials irradiated by femtosecond laser pulse. Two-dimensional heat transfer equations were solved numerically. The temperature dependent thermo-physical properties of the electron and the lattice are considered in the model. The Gaussian spatial and temporal distribution of the heat and temperature of the electron and the lattice is presented. The effect of reflectivity, electron — lattice coupling factor, and the spot size was studied using copper targets.

scholarly journals Light-Tunable Ferromagnetism in Atomically Thin Fe3GeTe2 Driven by Femtosecond Laser Pulse

2020 ◽  
Vol 125 (26) ◽  
Author(s):  
Bo Liu ◽  
Shanshan Liu ◽  
Long Yang ◽  
Zhendong Chen ◽  
Enze Zhang ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse

Temperature dependent electron–phonon coupling of Au resolved via lattice dynamics measured with sub-picosecond infrared pulses

2021 ◽  
Vol 129 (19) ◽  
pp. 193104
Author(s):  
John A. Tomko ◽  
Sushant Kumar ◽  
Ravishankar Sundararaman ◽  
Patrick E. Hopkins
Keyword(s):  
Lattice Dynamics ◽  
Phonon Coupling ◽  
Temperature Dependent ◽  
Electron Phonon Coupling
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