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Proceedings Paper

Surface damage of thin AlN films with increased oxygen content by nanosecond and femtosecond laser pulses
Author(s): Vitaly Gruzdev; Ildar Salakhutdinov; J. K. Chen; Yuriy Danylyuk; Erik McCullen; Gregory Auner
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Paper Abstract

AlN films deposited on sapphire substrates were damaged by single UV nanosecond (at 248 nm) and IR femtosecond (at 775 nm) laser pulses in air at normal pressure. The films had high (27-35 atomic %) concentration of oxygen introduced into thin surface layer (5-10 nm thickness). We measured damage threshold and studied morphology of the damage sites with atomic force and Nomarski optical microscopes with the objective to determine a correlation between damage processes and oxygen content. The damage produced by nanosecond pulses was accompanied by significant thermal effects with evident signatures of melting, chemical modification of the film surface, and specific redistribution of micro-defect rings around the damage spots. The nanosecond-damage threshold exhibited pronounced increase with increase of the oxygen content. In contrast to that, the femtosecond pulses produced damage without any signs of thermal, thermo-mechanical or chemical effects. No correlation between femtosecond-damage threshold and oxygen content as well as presence of defects within the laser-damage spot was found. We discuss the influence of the oxygen contamination on film properties and related mechanisms responsible for the specific damage effects and morphology of the damage sites observed in the experiments.

Paper Details

Date Published: 31 December 2009
PDF: 11 pages
Proc. SPIE 7504, Laser-Induced Damage in Optical Materials: 2009, 750404 (31 December 2009); doi: 10.1117/12.836865
Show Author Affiliations
Vitaly Gruzdev, Univ. of Missouri, Columbia (United States)
Ildar Salakhutdinov, Queens College, CUNY (United States)
J. K. Chen, Univ. of Missouri, Columbia (United States)
Yuriy Danylyuk, Wayne State Univ. (United States)
Erik McCullen, Wayne State Univ. (United States)
Gregory Auner, Wayne State Univ. (United States)

Published in SPIE Proceedings Vol. 7504:
Laser-Induced Damage in Optical Materials: 2009
Gregory J. Exarhos; Vitaly E. Gruzdev; Detlev Ristau; M. J. Soileau; Christopher J. Stolz, Editor(s)

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