Correlation between the basicity and optical property of Er~(3+) ion in oxide glasses

摘要

A number of glasses in various glass systems, such as B_2O_(3-), SiO_(2-) and TeO_2-based glass glasses, were prepared to examine the 1.5 μm absorption bandwidth △λ_a of Er~(3+) ions. According to the theory, the 1.5 μm bandwidth of Er~(3+) ions is dominated by the refractive index n and Judd-Ofelt parameter Ω_6. However, a significant correlation was found only between Ω_6 and △λ_g. It has been also proposed that the bandwidth was dominated by the optical basicity Λ, which could be theoretically estimated from glass composition. As expected, significant correlation was confirmed in each glass system, and correlation common to all the glass systems was, however, not found between △λ_a and Λ. Then, the relationship against Ols binding energy was In B_2O_(3-) and SiO_2-based glasses, a common correlation was observed, and in TeO_2-based glasses, however, the data points were located at the different region from the correlation curve for B_2O_(3-) and SiO_2-based glasses. It was finally concluded from phonon sideband spectra that the peculiarity in TeO_2-based glasses was attributable to the unique structure around Er~(3+) ions in TeO_2-based glasses.