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Title: 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 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.
Authors:
 [1] ;  [2] ;  [2] ;  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Purdue Univ., West Lafayette, IN (United States)
Publication Date:
Grant/Contract Number:
AC05-76RL01830
Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 23; Journal Issue: 12; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; laser-induced breakdown; plasma diagnostics; emission; imaging ultrafast phenomena
OSTI Identifier:
1222279
Alternate Identifier(s):
OSTI ID: 1214803