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Proceedings Paper

Surface cleaning and etching of rare-earth-doped phosphate glass
Author(s): Amy Suzanne Barnes; Carlo G. Pantano; Samuel D. Conzone
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Paper Abstract

The surface reactions of phosphate glasses are important for the processing and application of photonic devices, biomedical materials and conventional optical components. Of particular concern are the leaching of optically-active dopant species, surface layer formation and roughening during polishing, cleaning and other fabrication processes. In this study, the effects of various cleaning treatments, and both acid and base etching, were evaluated using surface analytical techniques (XPS, AFM). It is shown that in these phosphate glasses, the aluminum and rare-earth oxides have limited aqueous solubility, whereas the phosphate network is soluble over a wider range of pH. Thus, under those conditions where polishing damage can be removed by etching the surface, a localized precipitation of rare-earth oxides occurs which influences the final roughness and surface composition. Conversely, under conditions where this precipitation can be eliminated, an in-depth leaching of the surface occurs. These aqueous surface reactions were similar for both the optically-active and passive IOG-1 glasses. An optimized surface preparation method is described.

Paper Details

Date Published: 2 November 2001
PDF: 11 pages
Proc. SPIE 4452, Inorganic Optical Materials III, (2 November 2001); doi: 10.1117/12.446886
Show Author Affiliations
Amy Suzanne Barnes, The Pennsylvania State Univ. (United States)
Carlo G. Pantano, The Pennsylvania State Univ. (United States)
Samuel D. Conzone, Schott Glass Technologies Inc. (United States)

Published in SPIE Proceedings Vol. 4452:
Inorganic Optical Materials III
Alexander J. Marker; Mark J. Davis, Editor(s)

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