&lt;title&gt;Role of electron-phonon coupling in femtosecond laser damage of metals&lt;/title&gt;

Wellershoff, S.-S.; Güdde, J.; Hohlfeld, J.; Müller, J.G.; Matthias, E.

doi:10.1117/12.321573

Cited by 38 publications

(18 citation statements)

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“…The best fit to the experimental data was obtained for G ¼ 9 Â 10 16 W/m 3 K with an uncertainty of 62 Â 10 16 W/m 3 K. When values of G are within the error bar, the simulated and experimental X-ray diffraction efficiencies are in agreement, but when values of G lie outside the error bar, the simulation results start to deviate significantly from the experiment. The value of G is lower than those measured previously by Beaurepaire et al, 21 Wellershoff et al, 22 Saito et al, 23 Caffrey et al, 15 and Hopkins et al 24 (see Table II). In Table II it can be seen that a wide range of film thickness and fluencies have been used for the previous studies.…”

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confidence: 51%

“…In the studies cited, different methods and observables have been used. Beaurepaire et al 21 detected electron and spin temperatures, Caffrey et al 15 and Hopkins et al 24 detected electron and lattice temperatures whereas the study by Wellershoff et al 22 is based on damage thresholds. The conditions in the measurement by Saito et al 23 mostly resemble ours in terms of film thickness and method, since they also observed an acoustic response in the lattice.…”

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confidence: 99%

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Studies of electron diffusion in photo-excited Ni using time-resolved X-ray diffraction

Persson

Jarnac

Wang

et al. 2016

Applied Physics Letters

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We show that the heat deposition profile in a laser-excited metal can be determined by time-resolved X-ray diffraction. In this study, we investigated the electron diffusion in a 150 nm thick nickel film deposited on an indium antimonide substrate. A strain wave that mimics the heat deposition profile is generated in the metal and propagates into the InSb, where it influences the temporal profile of X-rays diffracted from InSb. We found that the strain pulse significantly deviated from a simple exponential profile, and that the two-temperature model was needed to reproduce the measured heat deposition profile. Experimental results were compared to simulations based on the two-temperature model carried out using commercial finite-element software packages and on-line dynamical diffraction tools. To reproduce the experimental data, the electron–phonon coupling factor was lowered compared to previously measured values. The experiment was carried out at a third-generation synchrotron radiation source using a high-brightness beam and an ultrafast X-ray streak camera with a temporal resolution of 3 ps.

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Studies of electron diffusion in photo-excited Ni using time-resolved X-ray diffraction

Persson

Jarnac

Wang

et al. 2016

Applied Physics Letters

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“…20 and references therein) reporting the g values of ∼2 × 10 16 W/m 3 K, which are quantitatively consistent with the present UED result. The g values reported for Cu (10 × 10 16 W/m 3 K) 2 and Mo (13 × 10 16 W/m 3 K) 34 are again much larger than that of Au, giving the qualitative similarity with UED. Quantitatively, however, they are somewhat smaller compared to the present work.…”

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confidence: 84%

Electron and lattice dynamics of transition metal thin films observed by ultrafast electron diffraction and transient optical measurements

Nakamura

Shimojima

Nakano

et al. 2016

Structural Dynamics

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We report the ultrafast dynamics of electrons and lattice in transition metal thin films (Au, Cu, and Mo) investigated by a combination of ultrafast electron diffraction (UED) and pump-probe optical methods. For a single-crystalline Au thin film, we observe the suppression of the diffraction intensity occuring in 10 ps, which direcly reflects the lattice thermalization via the electron-phonon interaction. By using the two-temperature model, the electron-phonon coupling constant (g) and the electron and lattice temperatures (Te, Tl) are evaluated from UED, with which we simulate the transient optical transmittance. The simulation well agrees with the experimentally obtained transmittance data, except for the slight deviations at the initial photoexcitation and the relaxed quasi-equilibrium state. We also present the results similarly obtained for polycrystalline Au, Cu, and Mo thin films and demonstrate the electron and lattice dynamics occurring in metals with different electron-phonon coupling strengths.

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“…13,[15][16][17] However, there is growing experimental evidence that the applicability of the constant G-factor is limited to a low intensity laser pulses. [18][19][20] Kaganov et al 21) proposed a theoretical model of the G-factor with electron relaxation time that is defined as the inverse of the electron-phonon collision frequency and usually assumed to be proportional to 1=T e , forcing the G-factor to be constant.…”

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Comparison of Theoretical Models of Electron-Phonon Coupling in Thin Gold Films Irradiated by Femtosecond Pulse Lasers

2011

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This study reports on a comparison of theoretical models for electron-phonon coupling that is substantially associated with nonequilibrium energy transport in thin gold films irradiated by femtosecond pulse lasers. Three published electron-phonon coupling models were analyzed with the use of a well-established two-temperature model to describe non-equilibrium energy transport between electrons and phonons. Based on the numerical results, at lower fluence, all models showed nearly similar tendencies, whereas at higher fluence, constant electronphonon coupling forced unrealistically long electron-phonon equilibration times and spatially long diffusive regions as it failed to intrinsically consider the effect of a high number density of excited d-band electrons. Even at higher fluence, however, both Lin's and Chen's models yielded physically reasonable results, showing converging electron-phonon equilibration times and steep gradients in the spatial lattice temperature profiles at higher laser fluence. In particular, Lin's model predicts nonlinear characteristics of heat capacity and lattice temperature with respect to laser fluence better than Chen's model. Moreover, the electron-phonon relaxation time increased with laser fluence, whereas at laser fluence greater than 0.05 J/cm 2 , the thermal equilibrium time was nearly independent of the laser fluence. Thus, it was concluded that Lin's model better predicted the electron-phonon coupling phenomena in thin metal films irradiated by ultra-short pulse lasers.

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<title>Role of electron-phonon coupling in femtosecond laser damage of metals</title>

Cited by 38 publications

References 1 publication

Studies of electron diffusion in photo-excited Ni using time-resolved X-ray diffraction

Studies of electron diffusion in photo-excited Ni using time-resolved X-ray diffraction

Electron and lattice dynamics of transition metal thin films observed by ultrafast electron diffraction and transient optical measurements

Comparison of Theoretical Models of Electron-Phonon Coupling in Thin Gold Films Irradiated by Femtosecond Pulse Lasers

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