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An improved model for nanosecond pulsed laser ablation of metals
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In this paper, a model for the ablation of metals by nanosecond laser pulses, based on one-dimensional heat flow with temperature dependent material properties, was presented for aluminum.Abstract:
A model is presented for the ablation of metals by nanosecond laser pulses, based on one-dimensional heat flow with temperature dependent material properties. A numerical optical calculation is introduced to account for laser beam absorption in the target, utilizing established matrix methods for electromagnetic plane wave propagation in multi-layered media. By including the effects of reflection from the dielectric-metal interface, the fall in reflectivity of aluminum during nanosecond laser pulses above the phase explosion threshold is found to be approximately twice that calculated in previous works. A simulated shielding coefficient is introduced to account for reflection and absorption of the incident laser beam by the ablation products. With these additions to foregoing models, good agreement between calculated and published experimental ablation data is attained for aluminum, both in terms of ablation threshold and depth. An investigation is subsequently carried out into the effects of laser wavelength, pulse duration and target thickness on the phase explosion threshold of aluminum.read more
Citations
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Stretchable and Transparent Kirigami Conductor of Nanowire Percolation Network for Electronic Skin Applications.
Phillip Won,Jung Jae Park,Taemin Lee,Inho Ha,Seonggeun Han,Mansoo Choi,Jinhwan Lee,Sukjoon Hong,Kyu-Jin Cho,Seung Hwan Ko +9 more
TL;DR: This work proposes a novel fabrication method to introduce kirigami approach to pattern a highly conductive and transparent electrode into diverse shapes of stretchable electronics with multivariable configurability for E-skin applications and demonstrates human-machine-interface using stretchable transparent kirigsami electrodes.
Journal ArticleDOI
Comparison of plasma temperature and electron density on nanosecond laser ablation of Cu and nano-Cu
TL;DR: In this article, a laser-induced breakdown spectroscopy is performed through the collection of spectra by spectral detection equipment at different delay times and distances from targets composed of Cu and nano-Cu, which are ablated using a Nd:YAG laser (532 nm, 10 ns, 10 Hz).
Journal ArticleDOI
Smoothed Particle Hydrodynamics (SPH) modelling of transient heat transfer in pulsed laser ablation of Al and associated free-surface problems
TL;DR: In this paper, a smoothed particle hydrodynamics (SPH) numerical model is developed to simulate pulsed-laser ablation processes for micro-machining.
Journal ArticleDOI
An improved three-dimensional two-temperature model for multi-pulse femtosecond laser ablation of aluminum
TL;DR: In this article, an improved three-dimensional two-temperature model for multi-pulse femtosecond laser ablation of aluminum was proposed and proved in an experiment.
Journal ArticleDOI
Numerical simulation on nanosecond laser ablation of titanium considering plasma shield and evaporation-affected surface thermocapillary convection
TL;DR: In this paper, a multi-physics axisymmetric two-dimensional (2D) model is presented to investigate the nanosecond laser ablation process of titanium at 1064 nm wavelength.
References
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Journal ArticleDOI
Electromagnetic propagation in periodic stratified media. I. General theory
TL;DR: In this article, a diagonalization of the unit cell translation operator is used to obtain exact solutions for the Bloch waves, the dispersion relations, and the band structure of the medium.
Journal ArticleDOI
Electron and lattice dynamics following optical excitation of metals
TL;DR: In this article, a pump-pump-probe technique was introduced which allows to study hot electron relaxation by probing the reflectivity in thermal equilibrium between electrons and lattice.
Journal ArticleDOI
Pulsed laser ablation of solids: transition from normal vaporization to phase explosion
TL;DR: In this article, the authors present experimental data on mass removal during 1064-nm pulsed laser ablation of graphite, niobium and YBa2Cu3O7-δ superconductor.
Journal ArticleDOI
Critical assessment of thermal models for laser sputtering at high fluences
Antonio Miotello,Roger Kelly +1 more
TL;DR: In this article, a critical assessment of thermal models for laser sputtering at high fluences is presented, and it is argued that the model explaining such sputtering by involving a subsurface superheating effect misinterprets the meaning of "vaporization" and "boiling" and as a result inappropriate boundary conditions are used, including those for both the surface temperature and for surface temperature gradient.
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Laser-induced phase explosion: new physical problems when a condensed phase approaches the thermodynamic critical temperature
Antonio Miotello,Roger Kelly +1 more
TL;DR: In this paper, it was shown that normal boiling is subject to a major kinetic obstacle in the process of bubble diffusion, such motion being sufficiently slow that it will simply not occur for t < 100 ns.