Morphological changes in ultrafast laser ablation plumes with varying spot size

Morphological changes in ultrafast laser ablation plumes with varying spot size

We investigated the role of spot size on plume morphology during ultrafast laser ablation of metal targets. Our results show that the spatial features of fs LA plumes are strongly dependent on the focal spot size. Two-dimensional self-emission images showed that the shape of the ultrafast laser abla...

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Veröffentlicht in:Optics express 2015-06, Vol.23 (12), p.15608-15615
Hauptverfasser: Harilal, S S, Diwakar, P K, Polek, M P, Phillips, M C
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Sprache:eng
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emission
imaging ultrafast phenomena
laser-induced breakdown
MATERIALS SCIENCE
plasma diagnostics
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creator Harilal, S S
Diwakar, P K
Polek, M P
Phillips, M C
description We investigated the role of spot size on plume morphology during ultrafast laser ablation of metal targets. Our results show that the spatial features of fs LA plumes are strongly dependent on the focal spot size. Two-dimensional self-emission images showed that the shape of the ultrafast laser ablation plumes changes from spherical to cylindrical with an increasing spot size from 100 to 600 μm. The changes in plume morphology and internal structures are related to ion emission dynamics from the plasma, where broader angular ion distribution and faster ions are noticed for the smallest spot size used. The present results clearly show that the morphological changes in the plume with spot size are independent of laser pulse width.
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subjects emission
imaging ultrafast phenomena
laser-induced breakdown
MATERIALS SCIENCE
plasma diagnostics
title Morphological changes in ultrafast laser ablation plumes with varying spot size
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