Hydrodynamic modeling and time-resolved imaging reflectometry of the ultrafast laser-induced ablation of a thin gold film

Olbrich, M.; Pflug, Theo; Wüstefeld, Christina; Motylenko, Mykhaylo; Sandfeld, Stefan; Rafaja, David; Horn, Alexander

doi:10.1016/j.optlaseng.2020.106067

Cited by 18 publications

(13 citation statements)

References 68 publications

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“…The induced pressure decays into two shock waves propagating in opposite directions, whereby one shock wave propagates into the material, and the other shock wave propagates towards the surface. The shock wave propagating towards the surfaces is reflected at the surfaces according to the wave impedance at the interface, and the shock wave is transformed into a rarefaction wave [23,[28][29][30].…”

Section: Two-temperature Modelmentioning

confidence: 99%

Experimental and Theoretical Determination of the Effective Penetration Depth of Ultrafast Laser Radiation in Stainless Steel

Metzner

Olbrich

Lickschat

et al. 2020

Lasers Manuf. Mater. Process.

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This study intends to present a simple two-temperature model (TTM) for the fast calculation of the ablation depth as well as the corresponding effective penetration depth for stainless steel by considering temperature-dependent material parameters. The model is validated by a comparison of the calculated to the experimentally determined ablation depth and the corresponding effective penetration depth in dependence on the pulse duration (200 fs up to 10 ps) and the fluence. The TTM enables to consider the interaction of pulsed laser radiation with the electron system and the subsequent interaction of the electrons with the phonon system. The theoretical results fit very well to the experimental results and enable the understanding of the dependence of the ablation depth and of the effective penetration depth on the pulse duration. Laser radiation with a pulse duration in the femtosecond regime results in larger ablation depths compared to longer-pulsed laser radiation in the picosecond regime. Analogously to the ablation depth, larger effective penetration depths are observed due to considerably higher electron temperatures for laser radiation with pulse durations in the femtosecond regime.

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Section: Two-temperature Modelmentioning

confidence: 99%

Experimental and Theoretical Determination of the Effective Penetration Depth of Ultrafast Laser Radiation in Stainless Steel

Metzner

Olbrich

Lickschat

et al. 2020

Lasers Manuf. Mater. Process.

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“…Micromachining. Besides characterizations of workpiece geometries, surface morphologies, microsctructures, and properties after laser micromachining, other important research approaches include in situ time-resolved observations and physics-based modeling to improve the understanding of laser micromachining processes [212][213][214][215][216][217][218][219][220][221][225][226][227][228][229][230][231][232][233][234][235][236][237][238][239].…”

Section: Research Approaches In the Study Of Lasermentioning

confidence: 99%

Overview of Laser Applications in Manufacturing and Materials Processing in Recent Years

Shin

Lei

et al. 2020

Journal of Manufacturing Science and Engineering

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Recent years have witnessed a rapid growth of the laser market. Figure 1 shows the recent revenues of laser sales with about 50% increase in revenue over recent four years , which far exceeds the growth of other industrial sectors. More than one third of this revenue belongs to the category of laser materials processing arena. Undoubtedly, lasers have been playing increasingly important roles in various industrial manufacturing sectors. This article is to capture some of important developments in the rapidly growing areas of laser-based manufacturing and materials processing and also describe important technological issues pertaining to various laser-based manufacturing processes. The topics to be covered in this paper include more popularly used processes in industry such as laser additive manufacturing, laser-assisted machining, laser micromachining, laser forming, laser surface texturing, laser welding, and laser shock peening, although there are several additional areas of laser applications. In each section, a brief overview of the process is provided, followed by critical issues in implementing the process, such as properties, predictive modeling, and process monitoring, and finally some remarks on future issues that can guide researchers and practitioners.

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“…The rising demands on laser processing in terms of precision and efficiency require a deep comprehension of the physical processes involved in the interaction of ultrashort pulsed laser radiation and matter. Pump–probe metrology has become an established technique for observing the ultrafast dynamics by measuring the optical response of the material with a temporal resolution at femtosecond time scales. − …”

Section: Introductionmentioning

confidence: 99%

“…The hot electrons interact with the lattice, scatter with phonons, or generate new phonons, and the material is heated. Thereby, the energy of the excited electron system is transferred to the lattice until an equilibrium between the two systems is achieved, within the relaxation time. ,,− ,− …”

Section: Introductionmentioning

confidence: 99%

“…Phase explosion occurs when the intensity of the exciting laser radiation is sufficient to induce a lattice temperature exceeding 90% of the thermodynamic critical temperature T c . − Thereby, a supercritical fluid is generated under a very high pressure of several 10 GPa, according to the results of hydrodynamic (HD) − and molecular dynamic (MD) − simulations. The high pressure induces an expansion of the supercritical fluid and thereby its cooling, as well as the emission of a shock and a rarefaction wave . Simultaneously, the temperature on the surface reduces due to heat diffusion.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fluence-Dependent Transient Reflectance of Stainless Steel Investigated by Ultrafast Imaging Pump–Probe Reflectometry

et al. 2021

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The ablation efficiency during laser processing strongly depends on the initial and transient reflectance of the irradiated material surface. This article reports on the transient relative change of the reflectance ΔR/R of stainless steel during and after ultrashort pulsed laser excitation (800 nm, 40 fs) by spatially resolved pump–probe reflectometry. The spatial resolution of the setup in combination with the spatial Gaussian intensity distribution of the pump radiation enables a fluence-resolved detection of ΔR/R. Within the first picosecond after irradiation with a peak fluence of 2 J/cm2, the spatially resolved ΔR/R of stainless steel evolves into an annular shape, in which the center almost remains at its initial reflectance, whereas the outer region features a decreased reflectance. The decreasing trend of ΔR/R is qualitatively supported by applying a two-temperature model, considering the transient optical properties of stainless steel from the literature. At larger fluences and thus higher electron temperatures, the experimental data deviate from the transient reflectance given in the literature. A drastically decreased occupation of the states below the Fermi energy and the subsequent excitation of electrons into these new vacant states by the probe radiation are considered being the most probable origin for this behavior at high fluences.

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Hydrodynamic modeling and time-resolved imaging reflectometry of the ultrafast laser-induced ablation of a thin gold film

Cited by 18 publications

References 68 publications

Experimental and Theoretical Determination of the Effective Penetration Depth of Ultrafast Laser Radiation in Stainless Steel

Experimental and Theoretical Determination of the Effective Penetration Depth of Ultrafast Laser Radiation in Stainless Steel

Overview of Laser Applications in Manufacturing and Materials Processing in Recent Years

Fluence-Dependent Transient Reflectance of Stainless Steel Investigated by Ultrafast Imaging Pump–Probe Reflectometry

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