The role of mass removal mechanisms in the onset of ns-laser induced plasma formation

The present study focuses on the role of mass removal mechanisms in ns-laser ablation. A copper sample is placed in argon, initially set at standard pressure and temperature. Calculations are performed for a 6 ns laser pulse with a wavelength of 532 nm and laser fluences up to 10 J/cm2. The transien...

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Bibliographic Details
Published in:Journal of applied physics 2013-07, Vol.114 (2)
Main Authors: Autrique, D., Clair, G., L'Hermite, D., Alexiades, V., Bogaerts, A., Rethfeld, B.
Format: Article
Language:English
Subjects:
ABLATION
ARGON
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER
HYDRODYNAMICS
LASER RADIATION
LIGHT TRANSMISSION
MASS
PLASMA PRODUCTION
PULSES
TRANSIENTS
WAVELENGTHS
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Summary:The present study focuses on the role of mass removal mechanisms in ns-laser ablation. A copper sample is placed in argon, initially set at standard pressure and temperature. Calculations are performed for a 6 ns laser pulse with a wavelength of 532 nm and laser fluences up to 10 J/cm2. The transient behavior in and above the copper target is described by a hydrodynamic model. Transmission profiles and ablation depths are compared with experimental results and similar trends are found. Our calculations reveal an interesting self-inhibiting mechanism: volumetric mass removal in the supercritical region triggers plasma shielding and therefore stops proceeding. This self-limiting process indicates that volumetric mass removal does not necessarily result in large ablation depths.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4812577