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Proceedings Paper

Role of defects in the laser ablation of wide bandgap materials
Author(s): J. Thomas Dickinson; L. C. Jensen; R. L. Webb; Jaw-Jung Shin; Steve C. Langford
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Paper Abstract

In model wide bandgap materials such as single crystal alkali halides and MgO (nominally transparent), the absorption of laser radiation at 248 nm (5 eV photons) at modest fluences is defect dominated. We describe a technique for imaging the initial defect densities by their luminescence at low laser fluences and show a typical photoluminescence image of cleaved MgO. High defect densities are observed along many cleavage steps, consistent with previous observations of strong point-to-point variations in the ablative response of cleaved MgO surfaces. At fluences below those required for sustained emission, the composition of neutral emissions from the surface can also be strongly influenced by impurity defects, as shown by the intense emission of carbon oxides and the correspondingly weak emissions of atomic and molecular oxygen from arc-fused MgO. We also present evidence for defect-mediated ion emission at these low fluences.

Paper Details

Date Published: 28 July 1994
PDF: 11 pages
Proc. SPIE 2114, Laser-Induced Damage in Optical Materials: 1993, (28 July 1994); doi: 10.1117/12.180947
Show Author Affiliations
J. Thomas Dickinson, Washington State Univ. (United States)
L. C. Jensen, Washington State Univ. (United States)
R. L. Webb, Washington State Univ. (United States)
Jaw-Jung Shin, Washington State Univ. (United States)
Steve C. Langford, Washington State Univ. (United States)

Published in SPIE Proceedings Vol. 2114:
Laser-Induced Damage in Optical Materials: 1993
Harold E. Bennett; Lloyd L. Chase; Arthur H. Guenther; Brian Emerson Newnam; M. J. Soileau, Editor(s)

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