Characterization of the polishing induced contamination of fused silica optics

Mathilde Pfiffer; Jean-Louis Longuet; Christine Labrugère; Evelyne Fargin; Bruno Bousquet; Marc Dussauze; Sébastien Lambert; Philippe Cormont; Jérôme Néauport

doi:10.1117/12.2244980

6 December 2016 Characterization of the polishing induced contamination of fused silica optics

Mathilde Pfiffer, Jean-Louis Longuet, Christine Labrugère, Evelyne Fargin, Bruno Bousquet, Marc Dussauze, Sébastien Lambert, Philippe Cormont, Jérôme Néauport

Author Affiliations +

Proceedings Volume 10014, Laser-Induced Damage in Optical Materials 2016; 100141F (2016) https://doi.org/10.1117/12.2244980
Event: SPIE Laser Damage, 2016, Boulder, Colorado, United States

Abstract

Secondary Ion Mass Spectroscopy (SIMS), Electron Probe Micro Analysis (EPMA) and X-Ray Photoelectron Spectroscopy (XPS) were used to analyze the polishing induced contamination layer at the fused silica optics surface. Samples were prepared using an MRF polishing machine and cerium-based slurry. The cerium and iron penetration and concentration were measured in the surface out of defects. Cerium is embedded at the surface in a 60 nm layer and concentrated at 1200 ppmw in this layer while iron concentration falls down at 30 nm. Spatial distribution and homogeneity of the pollution were also studied in scratches and bevel using SIMS and EPMA techniques. An overconcentration was observed in the chamfer and we saw evidence that surface defects such as scratches are specific places that hold the pollutants. A wet etching was able to completely remove the contamination in the scratch.

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Mathilde Pfiffer, Jean-Louis Longuet, Christine Labrugère, Evelyne Fargin, Bruno Bousquet, Marc Dussauze, Sébastien Lambert, Philippe Cormont, and Jérôme Néauport "Characterization of the polishing induced contamination of fused silica optics", Proc. SPIE 10014, Laser-Induced Damage in Optical Materials 2016, 100141F (6 December 2016); https://doi.org/10.1117/12.2244980

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