Role of defects in the laser ablation of wide bandgap materials

J. Thomas Dickinson; L. C. Jensen; R. L. Webb; Jaw-Jung Shin; Steve C. Langford

doi:10.1117/12.180947

28 July 1994 Role of defects in the laser ablation of wide bandgap materials

J. Thomas Dickinson, L. C. Jensen, R. L. Webb, Jaw-Jung Shin, Steve C. Langford

Proceedings Volume 2114, Laser-Induced Damage in Optical Materials: 1993; (1994) https://doi.org/10.1117/12.180947
Event: Laser-Induced Damage in Optical Materials: 1993, 1993, Boulder, CO, United States

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.

Citation Download Citation

J. Thomas Dickinson, L. C. Jensen, R. L. Webb, Jaw-Jung Shin, and Steve C. Langford "Role of defects in the laser ablation of wide bandgap materials", Proc. SPIE 2114, Laser-Induced Damage in Optical Materials: 1993, (28 July 1994); https://doi.org/10.1117/12.180947

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