Morphological changes in ultrafast laser ablation plumes with varying spot size

S. S. Harilal, P. K. Diwakar, M. P. Polek, M. C. Phillips

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)15608-15615
Number of pages8
JournalOptics Express
Volume23
Issue number12
DOIs
StatePublished - Jun 15 2015
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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