Modeling of fast phase transitions dynamics in metal target irradiated by pico- and femtosecond pulsed laser

Mazhukin, V. I.; Lobok, M. G.; Chichkov, Boris N.

doi:10.1016/j.apsusc.2008.08.014

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…Using the smoothing procedure of the enthalpy reduces the class of solutions of the phase transformations problems in the material; in particular, it excludes from consideration the effects of overheating and overcooling of the condensed matter [89,90]. High-speed phase transitions require explicit tracking of the phase boundaries [91]. Typically, the velocity of phase boundaries is determined numerically.…”

Section: Fast Phase Transitions (mentioning

confidence: 99%

“…Removal of the energy by the flow of matter in conjunction with volume mechanism of energy release of laser radiation contribute to the formation of metastable superheated regions in the volume of solid and liquid phases with near-surface temperature maximum. Calculations [13] showed that the maximum speed of melting front are comparable to the speed of sound ~ (0.5 -6) km / s, and the phase velocity of the solidification front are (10 -200) m / s. Accordingly, the maximum superheating / undercooling can reach several thousand / hundred degrees. The achievement of such overheating and overcooling leads to large gradients of the Gibbs energy, which actually determine the driving force for high-speed phase transformations.…”

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confidence: 98%

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Kinetics and Dynamics of Phase Transformations in Metals Under Action of Ultra-Short High-Power Laser Pulses

Mazhukin¹

2012

Laser Pulses - Theory, Technology, and Applications

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Additional information is available at the end of the chapter http://dx.doi.org/10.5772/50731 IntroductionAction of super-power and ultra-short laser pulses on highly absorbing condensed media is investigated in the past two decades [1] - [5]. The urgency of this problem is primarily determined by a variety of practical applications of pulsed laser irradiation. In a short period of time scientists have mastered such operations as ablation of elemental materials by femtosecond lasers (100 fs) [6], femtosecond nanostructuring [7], generation of metallic nanoparticles and nanostructures by laser ablation of massive targets by 40 fs and 2ps pulses [8], etc.The use of super-power G~10 12 ÷10 15 W/cm 2 and ultra-short τL≈10 -12 ÷10 -15 s laser pulses for dimensional processing of materials, such as cutting of various materials by picofemtosecond laser pulses [9], micro-drilling by a femtosecond laser [10 ], surface etching of metals (Al, Cu, Mo, Ni) and semiconductors (Si) [11], is accompanied by realization of unique physical conditions. In particular, the duration of action becomes comparable with the characteristic times of thermalization and phase transitions in matter. This leads to the need to address complex fundamental problems, including the heating of the material and the kinetics of phase transitions in a strong deviation from local thermodynamic equilibrium.It should be noted that the majority of laser technologies is associated with the beginning of phase transformations in the material. In particular, the action of pico -femtosecond laser pulses of high intensity on solid targets is one of the ways to create individual particles with unique characteristics, or to form their streams, consisting of a cluster, liquid or solid fragments of the target. The formation of the particle flux in the pulsed laser ablation is observed for a wide range of materials: metals, semiconductors and insulators. The Laser Pulses -Theory, Technology, and Applications 220 possibility of usage of laser ablation products in practical applications was the impetus for a number of experimental and theoretical studies [12], aimed at studying the conditions and mechanisms of formation of particles of nano -and micro-sizes during the laser exposure.The accumulation of knowledge of the experimental nature in the first place in this dynamic field leads not only to the variety of practical applications of pulsed laser action, but also to a number of issues of independent physical interest.T h e m a i n f e a t u r e s o f u l t r a s h o r t a c t i o n o n m e t a l s a r e a s s o c i a t e d w i t h h i g h s p e e d a n d voluminous nature of the energy release of the laser pulse. The high rate of heating of a condensed medium is associated with rapid phase transformations of matter, characterized by the transfer of superheated phase boundaries of high-power fluxes of mass and energy. Overheated metastable states at the interface are characterized by temperatures, whose values can be hundreds of degrees higher than the equilibrium val...

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Section: Fast Phase Transitions (mentioning

confidence: 99%

mentioning

confidence: 98%

Kinetics and Dynamics of Phase Transformations in Metals Under Action of Ultra-Short High-Power Laser Pulses

Mazhukin¹

2012

Laser Pulses - Theory, Technology, and Applications

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“…From a thermodynamics perspective, TiRe-LII amounts to perturbing a system initially at thermal equilibrium with a laser pulse, and then measuring how quickly the system returns to equilibrium through heat transfer between the nanoparticles and the surrounding gas. While the microsecond time-scales typical of the nanoparticle cooling rate are much longer than the nanosecond-scale laser pulse, the sub-femtosecond timescales important to the phase equilibrium across the solid–liquid and vapor interface are much shorter [ 68 ], and therefore evaporative models like the Clausius–Clapeyron equation, which relies on the presumption that the Gibbs free energy is the same on either side of the phase interface, accurately predict the vapor number density at the particle surface for the purposes of modeling evaporative cooling.…”

Section: Basicsmentioning

confidence: 99%

Laser-induced incandescence for non-soot nanoparticles: recent trends and current challenges

et al. 2022

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Laser-induced incandescence (LII) is a widely used combustion diagnostic for in situ measurements of soot primary particle sizes and volume fractions in flames, exhaust gases, and the atmosphere. Increasingly, however, it is applied to characterize engineered nanomaterials, driven by the increasing industrial relevance of these materials and the fundamental scientific insights that may be obtained from these measurements. This review describes the state of the art as well as open research challenges and new opportunities that arise from LII measurements on non-soot nanoparticles. An overview of the basic LII model, along with statistical techniques for inferring quantities-of-interest and associated uncertainties is provided, with a review of the application of LII to various classes of materials, including elemental particles, oxide and nitride materials, and non-soot carbonaceous materials, and core–shell particles. The paper concludes with a discussion of combined and complementary diagnostics, and an outlook of future research.

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A simple model for laser drilling

Collins

Gremaud

2011

Mathematics and Computers in Simulation

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Modeling of fast phase transitions dynamics in metal target irradiated by pico- and femtosecond pulsed laser

Cited by 8 publications

References 18 publications

Kinetics and Dynamics of Phase Transformations in Metals Under Action of Ultra-Short High-Power Laser Pulses

Kinetics and Dynamics of Phase Transformations in Metals Under Action of Ultra-Short High-Power Laser Pulses

Laser-induced incandescence for non-soot nanoparticles: recent trends and current challenges

A simple model for laser drilling

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