Pulsed laser evaporation: equation-of-state effects

Anisimov, S. I.; Inogamov, N. A.; Oparin, A. M.; Rethfeld, B.; Yabe, Takashi; Ogawa, Marília Marufuji; Фортов, В. Е.

doi:10.1007/s003390051041

Cited by 89 publications

(37 citation statements)

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“…The first theoretical analysis of condensation dynamics in a rapidly expanding vapor was performed by Raizer et al Anisimov et al [7] and Anisimov and Luk'yanchuk [8] analyzed this theory with a modern perspective. Raizer considered the self-consistent problem of vapor condensation during expansion, as applied to the problem of cosmic dust in star formation regions.…”

Section: Discussionmentioning

confidence: 99%

Critical Time to Nucleation: Graphite and Silicon Nanoparticle Generation by Laser Ablation

Senadheera

Tan

Venkatakrishnan

2009

Journal of Nanotechnology

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Femtosecond laser ablation hydrodynamics has been analyzed numerically. The nucleation process of two materials (silicon and graphite) in an expanding plume produced by a femtosecond laser ablation is analyzed within the framework of the ZeldovichRaizer theory (RZ theory). RZ theory is the most appropriate theory applicable to an expanding plume created by a femtosecond laser ablation and has been used to estimate the critical times in the evolution of nanoparticle formation. However, there is no experimental result to directly substantiate the theoretical model on a fundamental level. This paper gives an experimental approach to prove theoretical predictions of critical times to nucleation in laser-ablated graphite and silicon plumes. The critical time to nucleation deduced using the RZ theory was found to be in close agreement with pulse frequency at which fibrous nanoparticle aggregates start to form for both materials. We experimentally showed that the nanoparticle aggregates were produced consistently when the pulse frequency corresponding to the femtosecond laser time interval was shorter than the critical time to begin nucleation. Therefore the nucleation time acts as a threshold time length to begin nucleation.

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Section: Discussionmentioning

confidence: 99%

Critical Time to Nucleation: Graphite and Silicon Nanoparticle Generation by Laser Ablation

Senadheera

Tan

Venkatakrishnan

2009

Journal of Nanotechnology

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“…The nature of these rings has been already associated with an optical interference effect ͑dynamically moving Newton fringes͒. 16,27 The corresponding interference fringes are visible during the formation and spatial movement of a complex material density profile as a consequence of the formation of a so-called rarefaction wave ͑and its subsequent reflection, when material is passing through the liquid-gas coexistence regime 28 ͒ after fs irradiation of semiconductors and metals. The resulting density profile consists, at the air side of the expanding material, of a thin ablating layer with nearly solid state material density and a thickness smaller than the optical penetration depth in this optically excited ablating layer.…”

Section: Fs-trmmentioning

confidence: 98%

“…The resulting density profile consists, at the air side of the expanding material, of a thin ablating layer with nearly solid state material density and a thickness smaller than the optical penetration depth in this optically excited ablating layer. 28,29 The partial reflections at this dynamically moving layer and the reflection at the remaining surface underneath then allows interference effects to occur transiently.…”

Section: Fs-trmmentioning

confidence: 99%

Time- and space-resolved dynamics of melting, ablation, and solidification phenomena induced by femtosecond laser pulses in germanium

2006

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Femtosecond time-resolved microscopy has been used to analyze the structural transformation dynamics ͑melting, ablation, and solidification phenomena͒ induced by intense 130 fs laser pulses in single-crystalline ͑100͒-germanium wafers on a time scale from ϳ100 fs up to 10 ns. Complementary information on longer time scales ͑350 ps-1.4 s͒ has been obtained by means of simultaneous streak camera and photodiode measurements of the sample surface reflectivity. In the ablative regime, transient surface reflectivity patterns are observed by fs microscopy on a ps to ns time scale as a consequence of the complex spatial density structure of the ablating material. Complementing point-probing streak camera measurements allow one to characterize the temporal evolution in real time up to 40 ns after the fs-laser pulse excitation. Fs microscopy reveals additional reflectivity patterns for fluences below the ablation threshold of the germanium. It is shown that these patterns are originating from the selective removal of the native oxide layer at the wafer surface within a certain fluence range. After solidification, and in contrast to other semiconductors, surface amorphization has not been observed in ͑100͒-germanium upon femtosecond laser pulse irradiation in the studied fluence range.

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“…[22][23][24] This phenomenon is well known as the "spallation" in laser ablation at an irradiation fluence around the ablation threshold.…”

Section: Introductionmentioning

confidence: 99%

Formation of x-ray Newton’s rings from nano-scale spallation shells of metals in laser ablation

et al. 2017

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The initial stages of the femtosecond (fs) laser ablation process of gold, platinum, and tungsten were observed by single-shot soft x-ray imaging technique. The formation and evolution of soft x-ray Newton’s rings (NRs) were found for the first time. The soft x-ray NRs are caused by the interference between the bulk ablated surface and nanometer-scale thin spallation layer; they originate from the metal surface at pump energy fluence of around 1 J/cm2 and work as a flying soft x-ray beam splitter.

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Pulsed laser evaporation: equation-of-state effects

Cited by 89 publications

References 0 publications

Critical Time to Nucleation: Graphite and Silicon Nanoparticle Generation by Laser Ablation

Critical Time to Nucleation: Graphite and Silicon Nanoparticle Generation by Laser Ablation

Time- and space-resolved dynamics of melting, ablation, and solidification phenomena induced by femtosecond laser pulses in germanium

Formation of x-ray Newton’s rings from nano-scale spallation shells of metals in laser ablation

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