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Proceedings Paper

Langmuir probe study of laser ablation plume dynamics
Author(s): James G. Lunney; Brendan Doggett
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Paper Abstract

For many applications of pulsed laser ablation it is necessary to have an understanding of the expansion dynamics of the ablation plume both in vacuum and in low pressure gases. Knowledge of the ablation plume hydrodynamics can also contribute to the understanding of the laser ablation process. In this paper we will consider some of the existing theoretical models of laser ablation plume expansion and draw some conclusions as to which model is most appropriate for the low temperature plasmas which arise in pulsed laser deposition. For ablation plumes which are significantly ionised, Langmuir probes have proved to be a relatively simple and inexpensive tool for measuring the plume shape, ion energy distribution and electron temperature. We describe some recent work on the development of Langmuir probes for laser ablation plume diagnosis. Typically in laser ablation plasma the flow velocity is supersonic, which complicates the interpretation of the I-V probe characteristic. We describe some new work on the behaviour of a flat probe lying parallel to the plasma flow. For nanosecond ablation of silver, we also show how a planar Langmuir probe can be used to obtain a fairly comprehensive description of the expansion dynamics of the ionised part of the ablation plume, including plume shape, ion energy distribution and electron temperature.

Paper Details

Date Published: 7 June 2006
PDF: 12 pages
Proc. SPIE 6261, High-Power Laser Ablation VI, 62610B (7 June 2006); doi: 10.1117/12.675528
Show Author Affiliations
James G. Lunney, Trinity College (Ireland)
Brendan Doggett, Trinity College (Ireland)

Published in SPIE Proceedings Vol. 6261:
High-Power Laser Ablation VI
Claude R. Phipps, Editor(s)

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