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Time resolved Nomarski interferometery of laser produced plasma plumes

Hough, Pádraig and McLoughlin, Conor and Kelly, Thomas J. and Harilal, Sivanandan S. and Mosnier, Jean-Paul and Costello, John T. (2009) Time resolved Nomarski interferometery of laser produced plasma plumes. Applied Surface Science, 255 (10). pp. 5167-5171. ISSN 0169-4332

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Abstract

We report results from optical interferometric probing of a laser generated Zn plasma plume. The experiment was performed in a vacuum and O2 rich environments where the background pressure of O2 was maintained at 1000 Pa and the results from both regimes are compared. The focus of our work is very much on the early stages in the life of the plasma plume which remains, to date, a largely unexplored area of study, at least in the pulsed laser deposition research domain. It was found that the electron density profile normal to the target is different in the background gas at early times (30 ns) compared to that of the vacuum case. At later times (80 ns) both profiles have a very similar shape. We also observe the formation of a shock wave at the plasma–gas interface shortly after plasma breakdown (<15 ns).

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:laser; plasmas; Nomarski; interferometry; shockwave; electron density; pulsed laser deposition;
Subjects:Physical Sciences > Laser plasmas
Physical Sciences > Physics
Physical Sciences > Lasers
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:Elsevier
Official URL:http://dx.doi.org/10.1016/j.apsusc.2008.08.050
Copyright Information:Copyright © 2008 Elsevier B.V.
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Science Foundation Ireland, Irish Research Council for Science Engineering and Technology, DCU International Visiting Fellows Programme
ID Code:15133
Deposited On:03 Feb 2010 14:46 by Padraig Hough. Last Modified 10 Aug 2010 13:57

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