Dynamics evolution of shock waves in laser–material interaction

Gacek, Sobieslaw; Wang, Xinwei

doi:10.1007/s00339-008-4958-4

Cited by 26 publications

(25 citation statements)

References 23 publications

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“…Persistence generally increases with increasing system pressure because the plasma expansion rate decreases logarithmically with increasing pressure. Hence emission is confined to a location axially closer to the target surface where plasma temperatures are typically greater than if the plasma is allowed to expand in vacuum-like conditions (or low pressures) [38][39][40]. Therefore, at an axial distance of ~1.5 mm from the target surface, the emission persistence appears greater at higher pressures.…”

Section: Optical Emission Spectroscopymentioning

confidence: 99%

Significance of ambient conditions in uranium absorption and emission features of laser ablation plasmas

Skrodzki

Shah

Taylor

et al. 2016

Spectrochimica Acta Part B: Atomic Spectroscopy

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This study employs laser ablation (LA) to investigate mechanisms for U optical signal variation under various environmental conditions during laser absorption spectroscopy (LAS) and optical emission spectroscopy (OES). Potential explored mechanisms for signal quenching related to ambient conditions include plasma chemistry (e.g., uranium oxide formation), ambient gas confinement effects, and other collisional interactions between plasma constituents and the ambient gas. LA-LAS studies show that the persistence of the U ground state population is significantly reduced in the presence of air ambient compared to nitrogen. LA-OES yields congested spectra from which the U I 356.18 nm transition is prominent and serves as the basis for signal tracking. LA-OES signal and persistence vary negligibly between the test gases (air and N 2 ), unlike the LA-LAS results. The plume hydrodynamic features and plume fundamental properties showed similar results in both air and nitrogen ambient. Investigation of U oxide formation in the laser-produced plasma suggests that low U concentration in a sample hinders consistent detection of UO molecular spectra.

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Section: Optical Emission Spectroscopymentioning

confidence: 99%

Significance of ambient conditions in uranium absorption and emission features of laser ablation plasmas

Skrodzki

Shah

Taylor

et al. 2016

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…The incident laser energy decreases exponentially after the absorption in each cell. The details have been documented in the previous works [20,29,30].…”

Section: Physical Domain Construction and Modelingmentioning

confidence: 99%

“…Parameters relevant to laser ablation, such as the temperature, stress and volume in the laser ablation process are studied in detail. [27,29] is added to the atoms in this region. For shrink boundary condition, the position of the face is set so as to encompass the atoms in that dimension (shrink-wrapping), no matter how far they move.…”

Section: Introductionmentioning

confidence: 99%

Solid-to-super-critical phase change and resulting stress wave during internal laser ablation

Yao

et al. 2018

Journal of Thermal Stresses

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The mechanisms of phase change of argon during picosecond laser internal ablation are studied using molecular dynamics simulations. It is found that propagation of stress wave and fluctuation of temperature are periodical. The phase change process from solid to liquid to supercritical fluid then back to solid occurs as combined results of heating and the propagation of tensile stress wave induced by the laser pulse and the limited internal space.

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“…Details of such shock wave behavior can be seen in Feng and Wang's work [20] and visual evidence is provided by Porneala and Willis [21]. Gacek and Wang [22] gave a detailed description of the shock wave dynamics and evolution. Other phenomena related to shock wave such as mutual mass penetration and secondary shock wave have been explored.…”

Section: Introductionmentioning

confidence: 99%

“…Other phenomena related to shock wave such as mutual mass penetration and secondary shock wave have been explored. [22][23][24][25] Voids and bubbles in the molten region are also great concerns for researchers since they are directly related to the phase change process and final surface quality. Zhigilei et al [15] systematically discussed the reason for nucleation and spallation.…”

Section: Introductionmentioning

confidence: 99%

Material phase change under extreme domain confinement in laser material interaction

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Dynamics evolution of shock waves in laser–material interaction

Cited by 26 publications

References 23 publications

Significance of ambient conditions in uranium absorption and emission features of laser ablation plasmas

Significance of ambient conditions in uranium absorption and emission features of laser ablation plasmas

Solid-to-super-critical phase change and resulting stress wave during internal laser ablation

Material phase change under extreme domain confinement in laser material interaction

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