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Author Barmina, E. V. ♦ Simakin, Aleksandr V. ♦ Shafeev, Georgii A. ♦ Barberoglu, M. ♦ Zorba, V. ♦ Stratakis, E. ♦ Fotakis, K.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ ABLATION ♦ ABSORPTION SPECTRA ♦ ENERGY DENSITY ♦ EXCIMER LASERS ♦ FIELD EMISSION ♦ MELTING ♦ MORPHOLOGY ♦ NANOSTRUCTURES ♦ NEODYMIUM LASERS ♦ PULSES ♦ SAPPHIRE ♦ SCANNING ELECTRON MICROSCOPY ♦ SURFACES ♦ TANTALUM ♦ WATER ♦ CORUNDUM ♦ ELECTRON MICROSCOPY ♦ ELEMENTS ♦ EMISSION ♦ GAS LASERS ♦ HYDROGEN COMPOUNDS ♦ LASERS ♦ METALS ♦ MICROSCOPY ♦ MINERALS ♦ OXIDE MINERALS ♦ OXYGEN COMPOUNDS ♦ PHASE TRANSFORMATIONS ♦ REFRACTORY METALS ♦ SOLID STATE LASERS ♦ SPECTRA ♦ TRANSITION ELEMENTS
Abstract Surface nanotexturing of tantalum by ablation with short laser pulses in water has been studied experimentally using three ablation sources: a neodymium laser with a pulse duration of 350 ps, an excimer laser (248 nm) with a pulse duration of 5 ps and a Ti:sapphire laser with a pulse duration of 180 fs. The morphology of the nanotextured surfaces has been examined using a nanoprofilometer and field emission scanning electron microscope. The results demonstrate that the average size of the hillocks produced on the target surface depends on the laser energy density and is {approx}200 nm at an energy density approaching the laser-melting threshold of tantalum and a pulse duration of 350 ps. Their surface density reaches 10{sup 6} cm{sup -2}. At a pulse duration of 5 ps, the average hillock size is 60-70 nm. Nanotexturing is accompanied by changes in the absorption spectrum of the tantalum surface in the UV and visible spectral regions. The possible mechanisms of surface nanotexturing and potential applications of this effect are discussed. (nanostructures)
ISSN 10637818
Educational Use Research
Learning Resource Type Article
Publisher Date 2009-01-31
Publisher Place United States
Journal Quantum Electronics
Volume Number 39
Issue Number 1


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