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Langmuir probe study of plasma expansion in femtosecond pulsed laser ablation of silver
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Paper Abstract

A time-resolving Langmuir probe has been used to study the plasma plumes produced by ablation of silver with 200 femtosecond laser pulses at fluences of 1-12 J cm-2 at a central wavelength of 775 nm. Initial results have shown that surface contamination, and subsequent recontamination, can significantly influence the time of flight (TOF) signals obtained using the Langmuir probes. Surface conditioning techniques have been developed to overcome these influences. The TOF signals have been used to establish that the threshold fluence for the laser produced plasma in silver, under the present operating conditions, occurs at 1.04 J cm-2. The angular dependence of the magnitude of the ion yields and energies, at the time when the ion flux is maximized, agree with the predictions of Anisimov’s self-similar isentropic model of the plasma expansion.

Paper Details

Date Published: 8 June 2005
PDF: 10 pages
Proc. SPIE 5827, Opto-Ireland 2005: Photonic Engineering, (8 June 2005); doi: 10.1117/12.605164
Show Author Affiliations
Paul Mannion, National Univ. of Ireland/Galway (Ireland)
Sebastian Favre, National Univ. of Ireland/Galway (Ireland)
Gerard M. O'Connor, National Univ. of Ireland/Galway (Ireland)
Brendan Doggett, Trinity College Dublin (Ireland)
James G. Lunney, Trinity College Dublin (Ireland)
Thomas J. Glynn, National Univ. of Ireland/Galway (Ireland)

Published in SPIE Proceedings Vol. 5827:
Opto-Ireland 2005: Photonic Engineering
Thomas J. Glynn; John T. Sheridan; Brian W. Bowe; Ronan F. O'Dowd; Gerard M. O'Connor; Aidan J.H. Flanagan; Gerard D. O'Sullivan; Gerald Byrne; Jonathan Magee, Editor(s)

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