Direct visualization of the complete evolution of femtosecond laser-induced surface structural dynamics of metals

Fang, Ranran; Vorobyev, A. S.; Chen, Guo

doi:10.1038/lsa.2016.256

Cited by 112 publications

(63 citation statements)

References 41 publications

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“…• the lowest fluence at which surface modification is observable by means of an optical microscope [3,4], • geometric features of the ablated region [5][6][7], • plasma emission [8], • pulsed photoacoustic techniques [9,10], • ablated mass [11,12].…”

Section: Introductionmentioning

confidence: 99%

Picosecond-pulsed laser ablation of zinc: crater morphology and comparison of methods to determine ablation threshold

Mustafa¹,

Pohl²,

Bor³

et al. 2018

Opt. Express

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Ablation of bulk polycrystalline zinc in air is performed with single and multiple picosecond laser pulses at a wavelength of 1030 nm. The relationships between the characteristics of the ablated craters and the processing parameters are analyzed. Morphological changes of the ablated craters are characterized by means of scanning electron microscopy and confocal laser scanning microscopy. Chemical compositions of both the treated and untreated surfaces are quantified with X-ray photoelectron spectroscopy. A comparative analysis on the determination of the ablation threshold using three methods, based on ablated diameter, depth and volume is presented along with associated incubation coefficients. The single pulse ablation threshold value is found to equal 0.21 J/cm. Using the calculated incubation coefficients, it is found that both the fluence threshold and energy penetration depth show lesser degree of incubation for multiple laser pulses.

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Section: Introductionmentioning

confidence: 99%

Picosecond-pulsed laser ablation of zinc: crater morphology and comparison of methods to determine ablation threshold

Mustafa¹,

Pohl²,

Bor³

et al. 2018

Opt. Express

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“…Hydrodynamic velocities of foam expansion decrease from external (#1 in Figure 1A) to internal (#3 in Figure 1A) successive layers "1-2-3" which make the cascade [24,28]. Foam develops from the nucleated vapor cavities as they inflate decreasing a volume part of liquid in the liquid-vapor mixture.…”

Section: Nucleation and Foam -Formation And Decaymentioning

confidence: 99%

Laser ablation of metal into liquid: Near critical point phenomena and hydrodynamic instability

Inogamov

Zhakhovsky

Хохлов

2018

AIP Conference Proceedings

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Laser ablation of gold irradiated through the transparent water is studied. We follow dynamics of gold expansion into the water along very long (up to 200 ns) time interval. This is significant because namely at these late times pressure at a contact boundary between gold (Au) and water decreases down to the saturation pressure of gold. Thus the saturation pressure begins to influence dynamics near the contact. The inertia of displaced water decelerates the contact. In the reference frame connected with the contact, the deceleration is equivalent to the free fall acceleration in a gravity field. Such conditions are favorable for the development of Rayleigh-Taylor instability (RTI) because heavy fluid (gold) is placed above the light one (water) in a gravity field. We extract the increment of RTI from 2T-HD 1D runs. Surface tension and especially viscosity significantly dump the RTI gain during deceleration. Atomistic simulation with Molecular Dynamics method combined with Monte-Carlo method (MD-MC) for large electron heat conduction in gold is performed to gain a clear insight into the underlying mechanisms. MD-MC runs show that significant amplification of surface perturbations takes place. These perturbations start just from thermal fluctuations and the noise produced by bombardment of the atmosphere by fragments of foam. The perturbations achieve amplification enough to separate the droplets from the RTI jets of gold. Thus the gold droplets fall into the water. arXiv:1803.07343v1 [physics.comp-ph]

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“…[8]. The foam inflates greatly (for expansion into vacuum) and becomes many times thicker than the thickness of the heated zone or the ablated layer, thus the volume fraction of liquid in the foam becomes small.…”

Section: Introductionmentioning

confidence: 99%

“…The inflation process lasts longer and longer time as fluence F abs increases, up to hundreds of nanoseconds, see ref. [8].…”

Section: Introductionmentioning

confidence: 99%

Condensation of laser‐produced gold plasma during expansion and cooling in a water environment

Petrov

Inogamov

Zhakhovsky

et al. 2019

Contributions to Plasma Physics

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Physical processes involved in laser ablation in liquid (LAL) are studied using a gold target irradiated through transparent water. During and after irradiation, the heated material from the surface of a target produces a plume that expands into liquid-forming nanoparticles (NPs). The LAL method of NP production is ecologically much cleaner than others. A better understanding of the processes associated with complicated hydrodynamic phenomena leading to LAL is important for controlled manufacturing. We consider laser pulses with different durations L covering fifth orders of magnitudes ranging from 0.1 ps to 0.5 ns and large absorbed fluences F abs near optical breakdown of liquid. It is shown that the trajectory of the contact boundary with liquid at the middle and late stages after passing the maximum intensity of the longest pulse is rather similar for very different pulse durations if energies F abs are comparable. We trace how hot (in a few eV range) dense gold plasma expands, cools down, intersects a saturation curve, and condenses into NPs appearing first inside the water-gold diffusively mixed intermediate layer where gold vapour has the lowest temperature. Later, the pressure around the gold-water contact drops down below the critical pressure for water. As a result, the nanoparticles find themselves in gaseous water bubble where density of water gradually decreases to 10 −4 − 10 −5 g/cm 3 at maximum bubble expansion. K E Y W O R D Slaser ablation in liquid, laser gold plasma, nanoparticles

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Direct visualization of the complete evolution of femtosecond laser-induced surface structural dynamics of metals

Cited by 112 publications

References 41 publications

Picosecond-pulsed laser ablation of zinc: crater morphology and comparison of methods to determine ablation threshold

Picosecond-pulsed laser ablation of zinc: crater morphology and comparison of methods to determine ablation threshold

Laser ablation of metal into liquid: Near critical point phenomena and hydrodynamic instability

Condensation of laser‐produced gold plasma during expansion and cooling in a water environment

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