Heat Transfer in Femtosecond Laser Processing of Metal

Chowdhury, Ihtesham H.; Xu, Xianfan

doi:10.1080/716100504

Cited by 133 publications

(58 citation statements)

References 17 publications

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“…Various descriptions of melting, resolidification, surface vaporization, and ablation can be incorporated into such models, albeit at a rather simplified level. In particular, laser melting and resolidification are often described with a phase-change model based on an assumption of local equilibrium at the solid-liquid interface (heat-flow limited, interface kinetics formulated within the framework of the Stephan problem), e.g., [37][38][39], or using a kinetic equation relating the interface velocity to the interface temperature, e.g., [40][41][42][43][44]. The latter nonequilibrium kinetic description has been shown to be necessary for subnanosecond pulses, when a fast thermal energy flow to/from the liquid-solid interface creates conditions for significant overheating/undercooling of the interface [43,44].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, laser melting and resolidification are often described with a phase-change model based on an assumption of local equilibrium at the solid-liquid interface (heat-flow limited, interface kinetics formulated within the framework of the Stephan problem), e.g., [37][38][39], or using a kinetic equation relating the interface velocity to the interface temperature, e.g., [40][41][42][43][44]. The latter nonequilibrium kinetic description has been shown to be necessary for subnanosecond pulses, when a fast thermal energy flow to/from the liquid-solid interface creates conditions for significant overheating/undercooling of the interface [43,44]. The material removal from the target can be incorporated into continuum models in the form of surface or volumetric vaporization models, e.g., [45][46][47][48][49], whereas the expansion of the vaporized plume is commonly described by solving gas dynamics equations, e.g., [45][46][47][48][49] or using the Direct Simulation Monte Carlo (DSMC) technique, e.g., [50][51][52][53][54][55].…”

Section: Introductionmentioning

confidence: 99%

“…The highly nonequilibrium nature of the processes induced in the target material by the fast laser energy deposition, however, is challenging some of the basic assumptions of the continuum descriptions that are commonly designed based on the equilibrium material behavior and properties. Although incorporation of kinetic models and metastable states, e.g., [43,44,60,61], is possible within the continuum approach, the predictive power of the models is limited by the necessity to make a priori assumptions on the mechanisms and kinetics of all the processes that may take place during the simulation. The investigation of the generation of crystal defects and microscopic mechanisms of laser melting, nucleation and growth of voids in photomechanical spallation, the characteristics of the explosive volume ablation and the parameters of the ejected multicomponent and multiphase ablation plume is difficult if not impossible with continuum models.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Atomic/Molecular-Level Simulations of Laser–Materials Interactions

Zhigilei

Lin

Ivanov

et al. 2009

Laser-Surface Interactions for New Materials Production

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Summary. Molecular/atomic-level computer modeling of laser-materials interactions is playing an increasingly important role in the investigation of complex and highly nonequilibrium processes involved in short-pulse laser processing and surface modification. This chapter provides an overview of recent progress in the development of computational methods for simulation of laser interactions with organic materials and metals. The capabilities, advantages, and limitations of the molecular dynamics simulation technique are discussed and illustrated by representative examples. The results obtained in the investigations of the laser-induced generation and accumulation of crystal defects, mechanisms of laser melting, photomechanical effects and spallation, as well as phase explosion and massive material removal from the target (ablation) are outlined and related to the irradiation conditions and properties of the target material. The implications of the computational predictions for practical applications, as well as for the theoretical description of the laser-induced processes are discussed. IntroductionShort-pulse lasers are used in a diverse range of applications, from advanced materials processing, cutting, drilling, and surface micro-and nanostructuring [1,2] to pulsed-laser deposition of thin films and coatings [3], laser surgery [4,5], and artwork restoration [6,7], and to the exploration of the conditions for inertial confinement fusion, with the world's most energetic laser system being built at the National Ignition Facility at Lawrence Livermore National Laboratory [8]. At the fundamental science level, short-pulse laser irradiation has the ability to bring material into a highly nonequilibrium state and provides a unique opportunity to probe the material behavior under extreme conditions. In particular, optical pump-probe experiments have been used to investigate transient changes in the electronic structure of the irradiated surface with high (often subpicosecond) temporal resolution [9][10][11][12][13], whereas recent advances in time-resolved X-ray and electron diffraction

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Atomic/Molecular-Level Simulations of Laser–Materials Interactions

Zhigilei

Lin

Ivanov

et al. 2009

Laser-Surface Interactions for New Materials Production

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“…thermal explosion basing on the existing quantum Two Temperature Model (TTMq) [5,7,8]. But the problem is that this model does not give any information on the ablation state at low fluence (aroud ablation thershold), also the phase explosion model does not explane the absense of liquid around the crater at low fluence.…”

Section: Introductionmentioning

confidence: 99%

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

Abdelmalek

Bedrane

Amara

2018

J. Phys.: Conf. Ser.

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Abstract. We propose a classical Two Temperature Model TTMc where we consider the metal film during the irradiation like an ideal plasma. The numerical results are comparing to those finding by the existing TTM and the experimental data. In our model The cooper is taken as a target irradiated by a single laser pulse with 120 fs at 800 nm wavelength in air room. Our numerical results shown that there are a thermal and non-thermal explosion successively occurs in metal ablation by ultrashort laser pulse.

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“…It should be noted that the explosive-type vaporization (e.g. [4,5]) is not considered here. At the stage of numerical computations the algorithm based on the explicit scheme of the finite difference method with the staggered grid [6,7] is used.…”

Section: Introductionmentioning

confidence: 99%