Abstract

Correlations between the refractive-index change and the concentration of an oxygen-deficient center (ODC) induced by thermal treatments and laser irradiation are examined to clarify the origin of laser-induced volume compaction in synthetic SiO₂ glasses. A linear correlation between them was clearly observed for thermally induced ODC, whereas no correlation was found for ArF or F₂ laser irradiation. The results demonstrate that the dominant origin of laser-induced compaction is not ODC formation. Furthermore, we found that the presence of H₂ in SiO₂ glass had no influence on volume compaction but enhanced crack formation upon laser irradiation, a phenomenon most likely due to stress corrosion.

© 2004 Optical Society of America

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