A fundamental study of excimer laser ablation using experimental and MD simulation method

Horiuchi, Kazuo; Ishiyama, Masafumi; Yukimura, Ken; Imaida, Yutaka

doi:10.1016/s0254-0584(98)00081-9

Cited by 4 publications

(1 citation statement)

References 1 publication

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“…The study of picosecond laser induced melting is of great significance in understanding the interactional mechanism between laser and materials and improving the quality of laser micromachining [1].There were a few attempts to address the process of ultrashort laser-metal interaction and study the interactional mechanisms to some extent by conventional MD method [2,3]. But conventional MD method doesn't take thermal transport of free electrons into account and leads to an underestimated thermal transport as well as unphysical simulation results compared with those of experiments.…”

Section: Introductionmentioning

confidence: 99%

Picosecond Pulsed Laser Induced Melting of Monocrystalline Copper: A Hybrid Simulation

Liu

Feng

2010

AMR

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A hybrid method combing molecular dynamics and two-step radiation heating model is used to study the kinetics and microscopic mechanisms of picosecond laser melting of monocrystalline copper in stress confinement regime. The nonequilibrium processes of laser melting are simulated by classical MD method, and laser excitation as well as subsequent relaxation of the conduction band electrons are described continually by two-step radiation heating model. The mechanism responsible for melting of copper under picosecond laser pulse irradiation can be attributed to homogeneous nucleation of the liquid phase inside the solid region. The speed of stress wave is predicted to be 4400m/s equal to that of sound. The liquid and crystal regions are identified definitely in the atomic configurations by means of Local Order Parameter, in-plane structure and number density of atoms. Velocity-reducing technique is proved efficient in avoiding the influence of the reflected stress wave on melting process by comparing two models with velocity-reducing technique and free boundary condition at the bottom respectively.

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Section: Introductionmentioning

confidence: 99%

Picosecond Pulsed Laser Induced Melting of Monocrystalline Copper: A Hybrid Simulation

Liu

Feng

2010

AMR

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Simulating scratch behavior of polymers with mesoscopic molecular dynamics

Hilbig¹,

Brostow²,

Simões

2013

Materials Chemistry and Physics

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Thermal and Thermomechanical Phenomena in Picosecond Laser Copper Interaction

Wang

2004

Journal of Heat Transfer

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Thermal and thermomechanical phenomena in laser metal interaction are of great importance in terms of understanding the underlying mechanisms in laser materials processing, optimizing the efficiency of laser micro-machining, and minimizing laser induced damage. In this work, Molecular Dynamics (MD) simulation is carried out to investigate picosecond laser copper interaction. A method has been developed to account for the laser beam absorption in, and the thermal transport sustained by, free electrons. Superheating is observed, and an evident temperature drop is revealed at the solid-liquid interface, which moves at a speed of 4400 m/s. However, the later phase change from solid to liquid happens in the target simultaneously and no visible movement of solid-liquid interface is observed. The results show that the laser induced stress wave consists of a strong compressive stress and a weak tensile stress. After reflection at the back side of the MD domain, the strong compressive stress becomes a strong tensile stress, which results in a visible drop of the number density of atoms. In the presence of this strong tensile stress, voids have formed in the region near the back side of the MD domain, indicating that the strong tensile stress in laser materials interaction plays an important role in terms of inducing structural damage.

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A fundamental study of excimer laser ablation using experimental and MD simulation method

Cited by 4 publications

References 1 publication

Picosecond Pulsed Laser Induced Melting of Monocrystalline Copper: A Hybrid Simulation

Picosecond Pulsed Laser Induced Melting of Monocrystalline Copper: A Hybrid Simulation

Simulating scratch behavior of polymers with mesoscopic molecular dynamics

Thermal and Thermomechanical Phenomena in Picosecond Laser Copper Interaction

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