Acoustic Characterization of Silica Glasses

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Abstract

<jats:p>Acoustic characterization of doped silica glasses with a GeO<jats:sub>2</jats:sub>, P<jats:sub>2</jats:sub>O<jats:sub>5</jats:sub>, F, TiO<jats:sub>2</jats:sub>, Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>, or B<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> dopant having different concentrations is presented. Quantitative measurements were performed with a 225‐MHz line‐focus‐beam scanning acoustic microscope. The acoustic velocity variation due to different dopant concentrations is given. It has been found that the Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> dopant increases, but the other dopants decrease, the acoustic velocity as compared with that of the pure fused silica. We have also found that the fractional change in acoustic velocity is greater than that in refractive index for a given dopant concentration.</jats:p>

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