Ablation of gold irradiated by femtosecond laser pulse: Experiment and modeling

We report on the ablation phenomena in gold sample irradiated by femtosecond laser pulses of moderate intensity. Dynamics of optical constants and expansion of a heated surface layer was investigated in a range from picosecond up to subnanosecond using ultrafast interferometry. Also morphology of th...

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Published inJournal of physics. Conference series Vol. 774; no. 1; pp. 12097 - 12156
Main Authors Ashitkov, S I, Komarov, P S, Zhakhovsky, V V, Petrov, Yu V, Khokhlov, V A, Yurkevich, A A, Ilnitsky, D K, Inogamov, N A, Agranat, M B
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.11.2016
Subjects
Ablation
Cavitation
Femtosecond pulses
Fluence
Gold
Lasers
Mass flow
Molecular dynamics
Morphology
Physics
Simulation
Spallation
Strain rate
Surface layers
Thermalization (energy absorption)
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Summary:We report on the ablation phenomena in gold sample irradiated by femtosecond laser pulses of moderate intensity. Dynamics of optical constants and expansion of a heated surface layer was investigated in a range from picosecond up to subnanosecond using ultrafast interferometry. Also morphology of the ablation craters and value of an ablation threshold (for absorbed fluence) were measured. The experimental data are compared with simulations of mass flows obtained by two-temperature hydrodynamics and molecular dynamics methods. Simulation shows evolution of a thin surface layer pressurized by a laser pulse. Unloading of the pressurized layer proceeds together with electron-ion thermalization, melting, cavitation and spallation of a part of surface liquid layer. The experimental and simulation results on two-temperature physics and on a fracture, surface morphology and strength of liquid gold at a strain rate ∼ 109 s-1 are discussed.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/774/1/012097