Near-surface laser–vapour coupling in nanosecond pulsed laser ablation

Gusarov, A.V.; Smurov, I.

doi:10.1088/0022-3727/36/23/016

Cited by 38 publications

(21 citation statements)

References 31 publications

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“…The same SPH results also achieved a good correlation with the ablation rates predicted by a numerical model [77] of supercritical ablation with an optical breakdown in the volume of the vapour phase (see Figure 25 b). This model was different from the previous numerical models as it includes the interaction between the laser radiation and the gas phase produced when the vapour temperature exceeds the critical temperature of aluminium.…”

Section: Temperature and Vapour Pressuresupporting

confidence: 72%

Smoothed Particle Hydrodynamics (SPH) modelling of transient heat transfer in pulsed laser ablation of Al and associated free-surface problems

Alshaer

Rogers

2017

Computational Materials Science

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A smoothed particle hydrodynamics (SPH) numerical model is developed to simulate pulsed-laser ablation processes for micro-machining. Heat diffusion behaviour of a specimen under the action of nanosecond pulsed lasers can be described analytically by using complementary error function solutions of second-order differential equations. However, their application is limited to cases without loss of material at the surface. Compared to conventional mesh-based techniques, as a novel meshless simulation method, SPH is ideally suited to applications with highly nonlinear and explosive behaviour in laser ablation. However, little is known about the suitability of using SPH for the modelling of laser-material interactions with multiple phases at the micro scale. The present work investigates SPH modelling of pulsed-laser ablation of aluminium where the laser is applied directly to the free-surface boundary of the specimen. Having first assessed the performance of standard SPH surface treatments for functions commonly used to describe laser heating, the heat conduction behaviour of a new SPH methodology is then evaluated through a number of test cases for single-and multiple-pulse laser heating of aluminium showing excellent agreement when compared with an analytical solution. Simulation of real ablation processes, however, requires the model to capture the removal of material from the surface and its subsequent effects on the laser heating process. Hence, the SPH model for describing the transient behaviour of nanosecond laser ablation is validated with a number of experimental and reference results reported in the literature. The SPH model successfully predicts the material ablation depth profiles over a wide range of laser fluences 4-23 J/cm 2 and pulse durations 6-10 ns, and also predicts the transient behaviour of the ejected material during the laser ablation process. Unlike conventional mesh-based methods, the SPH model was not only able to provide the thermo-physical properties of the ejected particles, but also the effect of the interaction between them as well as the direction and the pattern of the ejection.2

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Section: Temperature and Vapour Pressuresupporting

confidence: 72%

Smoothed Particle Hydrodynamics (SPH) modelling of transient heat transfer in pulsed laser ablation of Al and associated free-surface problems

Alshaer

Rogers

2017

Computational Materials Science

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“…A hydrodynamic model, which describes the behavior of both vapor and background gas, has been developed by Gnedovets and Gusarov, and it is applied to expansion in a background gas at 1 atm, but for a long laser pulse (msrange) at very low laser irradiance (i.e., 10 4 -10 5 W/cm 2 ), so that no plasma is formed [18 -20]. Recently, Gusarov and Smurov have applied this model to shorter laser pulses (nsrange) at a laser irradiance in the order of 10 9 W/cm 2 , hence conditions typical for LA and LIBS, but without taking into account the formation of a plasma [21]. It is, however, clear that plasma formation is important at these conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of laser parameters on laser ablation and laser-induced plasma formation: A numerical modeling investigation

Bogaerts

Chen

2005

Spectrochimica Acta Part B: Atomic Spectroscopy

232

101

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“…More scarce are models where the distinction between metal vapor and surrounding gas is taken into account e.g. [14]. In [15] a mono-dimensional model that distinguishes both vapor phases and incorporates plasma formation is described.…”

Section: Introductionmentioning

confidence: 99%

Multiphysical Simulation of ns-Laser Ablation of Multi-material LED-structures

et al. 2014

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Structuring of multilayer stacks with ns-laser pulses is widely used in the industrial production of LEDs. These stacks are built up from several different materials each one layered upon each other. In order to thoroughly understand the physics of the structuring process a multiphysical simulation model has been developed. This model is capable to handle the beam propagation and the energy coupling into the work piece both for transparent and for absorbing materials as well as phase transitions (melting, solidifying, evaporation, condensation) of multiple different materials within the calculation domain. Furthermore a modified volume of fluid approach has been developed to calculate the material and energy flow within both the liquid and vapor phases and thus to track the free surface of the material during laser ablation. The paper gives an insight into this model illuminating the physical background of the ablation process and shows the excellent correspondence of the simulations with experimentally obtained results.

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Near-surface laser–vapour coupling in nanosecond pulsed laser ablation

Cited by 38 publications

References 31 publications

Smoothed Particle Hydrodynamics (SPH) modelling of transient heat transfer in pulsed laser ablation of Al and associated free-surface problems

Smoothed Particle Hydrodynamics (SPH) modelling of transient heat transfer in pulsed laser ablation of Al and associated free-surface problems

Effect of laser parameters on laser ablation and laser-induced plasma formation: A numerical modeling investigation

Multiphysical Simulation of ns-Laser Ablation of Multi-material LED-structures

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