Insights into Laser-Materials Interaction Through Modeling on Atomic and Macroscopic Scales

Shugaev, Maxim V.; He, Miao; Lizunov, Sergey A.; Lévy, Yoann; Derrien, Thibault J.-Y.; Zhukov, V. P.; Bulgakova, Nadezhda M.; Zhigilei, Leonid V.

doi:10.1007/978-3-319-96845-2_5

Cited by 15 publications

(9 citation statements)

References 154 publications

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“…Excited electronic ensemble equilibrates at an electronic temperature high above the atomic one. It induces a variety of effects, including electronic energy exchange with atoms/ions, modification of the interatomic potential, possible charge nonequilbirium and Coulombic response of the ions, evolution of the material properties and phase transitions [9][10][11]. Within this work, we will only focus on the first one, the electron-ion coupling.…”

Section: Introductionmentioning

confidence: 99%

Electron-phonon coupling in metals at high electronic temperatures

2020

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Even though electron-phonon coupling is one of the most important parameters governing material evolution after ultrafast energy deposition it remains the most unexplored one. In this work we apply the dynamical coupling approach to calculate the nonadiabatic electron-ion energy exchange in nonequilibrium solids with the electronic temperature high above the atomic one. It is implemented into the tight-binding molecular dynamics code and used to study electron-phonon coupling in various elemental metals. The approach developed is a universal scheme applicable to electronic temperatures up to a few electron volts and to arbitrary atomic configurations and dynamics. We demonstrate that the calculated electron-ion (electron-phonon) coupling parameter agrees well with the available experimental data in the high-electronic-temperature regime, validating the model. The following materials are studied here: fcc

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Section: Introductionmentioning

confidence: 99%

Electron-phonon coupling in metals at high electronic temperatures

2020

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“…For ultrashort pulses, the dynamic reflectivity depends on the electron temperature. The dynamic reflectivity of Zn was measured for 150 fs, 800 nm laser pulse at different fluence values by Shugaev et al [40]. They demonstrated that the dynamic and static reflectivity of Zn stays the same up to 1 J∕cm 2 .…”

Section: Discussionmentioning

confidence: 99%

“…To account for the changing dielectric permittivity with increasing electron temperature, Kirkwood et al divided the dielectric function into three domains based on the Fermi temperature ( T F ), namely metallic (Drude-Lorentz) dielectric function m for T e ≤ (1∕3) * T F , plasma dielectric function plasma for T e > 3 * T F and a combination of m and plasma for (1∕3) * T F < T e ≥ 3 * T F [41]. For femtosecond pulses, the plasma contribution is small on the dynamic reflectivity for Au and Zn, and primarily contributes to the leveling-off of reflectance value [40]. For picosecond laser pulses, the pulse duration is long enough to increase electron temperature above the Fermi temperature, to affect the electron-phonon coupling and subsequent early plasma formation during the pulse.…”

Section: Discussionmentioning

confidence: 99%

Wavelength dependence of picosecond-pulsed laser ablation of hot-dip galvanized steel

2022

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Laser ablation of galvanized steel at a wavelength of 343, 515 and 1030 nm was compared for single as well as multiple picosecond laser pulses. The characteristics of ablated craters, such as ablation rate, crater shape and chemical composition, in relation to the processing parameters were studied. Surface morphology of the laser ablated craters were characterized with the help of confocal laser scanning microscopy and scanning electron microscopy. Chemical compositional and crystallographic changes were analyzed by energy-dispersive X-ray spectroscopy and electron backscatter diffraction respectively. Three ablation regimes were identified in the ablation process of galvanized steel. For equal amount of fluence, ablation rates are found to increase with decreasing laser wavelength. Analyzing the crater shape and the cross-sectional chemical composition, three possible applications are identified for three different wavelengths when processing galvanized steel with picosecond pulsed lasers, namely coating removal, surface texturing and micro-drilling.

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“…The interaction of ultrashort laser pulses with metals is typically described by the twotemperature model (TTM) [4,[7][8][9]. This consists of two heat flow equations; one for the conduction electrons, that absorb the laser radiation, and one for the lattice.…”

Section: Introductionmentioning

confidence: 99%

“…A deep insight into fundamental aspects of the electron gas behavior under non-equilibrium laser heating conditions can be obtained based on the Boltzmann equation [11,12], which however is difficult to use for practical application in view of the large computer resources required. There are many attempts to improve the TTM description using more sophisticated dependences of the free electron gas properties [8,9,[13][14][15][16], in particular, utilizing parameters calculated based on the density of states theory developed in [17] under the assumption of equilibrium conditions. However, the actual parameters of the free electron gas in metals are expected to lie in between the two extremes, resulting in a more complicated behavior under the highly non-equilibrium conditions obtained under ultrafast laser action [18].…”

Section: Introductionmentioning

confidence: 99%

Melting of gold by ultrashort laser pulses: advanced two-temperature modeling and comparison with surface damage experiments

et al. 2022

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The ultrafast laser-induced solid-liquid phase transition in metals is still not clearly understood and its accurate quantitative description remains a challenge. Here we systematically investigated, both experimentally and theoretically, the melting of gold by single femto-and picosecond nearinfrared laser pulses. Two laser systems with wavelengths of 800 and 1030 nm and pulse durations ranging from 124 fs to 7 ps were used and the damage and ablation thresholds were determined for each irradiation condition. The theoretical analysis was based on two-temperature modeling.Different expressions for the electron-lattice coupling rate and contribution of ballistic electrons were examined. In addition, the number of free electrons involved in the optical response is suggested to be dependent on the laser intensity and the influence of the fraction of involved electrons on the damage threshold was investigated. Only one combination of modelling parameters was able to describe consistently all the measured damage thresholds. Physical arguments are presented to explain the modeling results.

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Insights into Laser-Materials Interaction Through Modeling on Atomic and Macroscopic Scales

Cited by 15 publications

References 154 publications

Electron-phonon coupling in metals at high electronic temperatures

Electron-phonon coupling in metals at high electronic temperatures

Wavelength dependence of picosecond-pulsed laser ablation of hot-dip galvanized steel

Melting of gold by ultrashort laser pulses: advanced two-temperature modeling and comparison with surface damage experiments

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