Thermal and non-thermal explosion in metals ablation by femtosecond laser pulse: classical approach of the Two Temperature Model

Abdelmalek, Ahmed; Bedrane, Zeyneb; Amara, El-Hachemi

doi:10.1088/1742-6596/987/1/012012

Cited by 10 publications

(5 citation statements)

References 22 publications

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“…Therefore, we deduce that the most laser energy is deposited by the subsequent pulses reserved for the overheating of the same focal volume irradiated by the first pulse. We notice in Figure 7 that at F = 1 J/cm 2 , the ablation rate is disordered, which confirms our previous proposal [32] that the physical mechanism changes when the ablation phases change [6], where at low fluence, electron-ion collision is the most dominant, implying a gentle ablation, but at high fluence, electron-phonon collision is the most dominant, implying a strong ablation. In summary, the first intense ultrashort laser pulse can produce a superheated liquid [10,13], but because the interpulse separation is less than the thermal relaxation time, the thermal wave has no time to propagate deeper into the material.…”

Section: Fluence (J/cm 2 )supporting

confidence: 88%

Ablation of Copper Metal Films by Femtosecond Laser Multipulse Irradiation

et al. 2018

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Ablation of copper using multipulse femtosecond laser irradiation with an 800 nm wavelength and 120-fs pulse duration is investigated theoretically. A two-temperature model, which includes dynamic optical and thermal-physical properties, is considered. The numerical results of the material thermal response obtained by varying the pulse number, the separation times between pulses and laser fluences are presented. Our results show that the increasing of pulse number with a separation time less than the thermal relaxation time can dramatically enhance the lattice temperature without a noticeable increase in ablation depth. Therefore, we suggest that the vaporization rate can be augmented in comparison to the melting rate during the same single-phase explosion at the same total fluence where a fast heat accumulation effect plays an important role for cleaner ablation during micromachining.

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Section: Fluence (J/cm 2 )supporting

confidence: 88%

Ablation of Copper Metal Films by Femtosecond Laser Multipulse Irradiation

et al. 2018

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“…To calculate the heat propagation in the material, the two-temperature model is used [4,[18][19][20][21], in which the evolution of the electron temperature T e is described by C e ∂ t T e = ∇ • (λ e (T e )∇T e ) − G(T e − T ph ) + S,…”

Section: Two-temperature Modelmentioning

confidence: 99%

Experimental and Theoretical Determination of the Effective Penetration Depth of Ultrafast Laser Radiation in Stainless Steel

Metzner

Olbrich

Lickschat

et al. 2020

Lasers Manuf. Mater. Process.

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This study intends to present a simple two-temperature model (TTM) for the fast calculation of the ablation depth as well as the corresponding effective penetration depth for stainless steel by considering temperature-dependent material parameters. The model is validated by a comparison of the calculated to the experimentally determined ablation depth and the corresponding effective penetration depth in dependence on the pulse duration (200 fs up to 10 ps) and the fluence. The TTM enables to consider the interaction of pulsed laser radiation with the electron system and the subsequent interaction of the electrons with the phonon system. The theoretical results fit very well to the experimental results and enable the understanding of the dependence of the ablation depth and of the effective penetration depth on the pulse duration. Laser radiation with a pulse duration in the femtosecond regime results in larger ablation depths compared to longer-pulsed laser radiation in the picosecond regime. Analogously to the ablation depth, larger effective penetration depths are observed due to considerably higher electron temperatures for laser radiation with pulse durations in the femtosecond regime.

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“…Therefore, the heat conduction problem can be described by one-dimensional heat conduction equation along the direction of laser irradiation. At the same time, in the process of ultra-short pulsed laser ablation, the heat affected area is small, which makes the thickness of melting layer smaller [65]. Therefore, the effect of the dielectric layer is not considered in this model, which has a great influence on nanosecond laser ablation [66,67].…”

Section: Heat Conduction Equation For Two Different Stagesmentioning

confidence: 99%

“…Despite this, the limited validity of the TTM still exists [60][61][62][63], one of which is that the validity verification at higher laser fluence is still problematic [63]. In addition, the effects of plasma shielding are not considered in most TTMs, which may lead to overestimation of ablation depth at higher laser fluence [64,65].…”

Section: Introductionmentioning

confidence: 99%

A Model of Ultra-Short Pulsed Laser Ablation of Metal with Considering Plasma Shielding and Non-Fourier Effect

Tan

Wang

et al. 2018

Energies

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In this paper, a non-Fourier heat conduction model of ultra-short pulsed laser ablation of metal is established that takes into account the effect of the heat source, laser heating of the target, the evaporation and phase explosion of target material, the formation and expansion of the plasma plume, and interaction of the plasma plume with the incoming laser. Temperature dependent optical and thermophysical properties are also considered in the model due to the properties of the target will change over a wide range during the ultra-short pulsed laser ablation process. The results show that the plasma shielding has a great influence on the process of ultra-short pulsed laser ablation, especially at higher laser fluence. The non-Fourier effect has a great influence on the temperature characteristics and ablation depth of the target. The ultra-short pulsed laser ablation can effectively reduce the heat affected zone compared to nanosecond pulsed laser ablation. The comparison between the simulation results and the experimental results in the literature shows that the model with the plasma shielding and the non-Fourier effect can simulate the ultra-short pulsed laser ablation process better.

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Thermal and non-thermal explosion in metals ablation by femtosecond laser pulse: classical approach of the Two Temperature Model

Cited by 10 publications

References 22 publications

Ablation of Copper Metal Films by Femtosecond Laser Multipulse Irradiation

Ablation of Copper Metal Films by Femtosecond Laser Multipulse Irradiation

Experimental and Theoretical Determination of the Effective Penetration Depth of Ultrafast Laser Radiation in Stainless Steel

A Model of Ultra-Short Pulsed Laser Ablation of Metal with Considering Plasma Shielding and Non-Fourier Effect

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