Thermal sensors based on ytterbium-erbium doped nano-glassceramics
Lead-fluoride nano-glassceramics doped with ytterbium and erbium have been developed and synthesized. The influence of heating on the green up-conversion luminescence of erbium has been experimentally investigated. Nano-glassceramics are promising candidates for temperature sensors.
Site selective study of Eu3+-doped transparent oxyfluoride glass ceramics
Optical properties of Eu3+ ions in oxyfluoride glasses and glass ceramics doped with two different concentrations, 0.1 and 1 mol %, have been analyzed and compared with previous results for higher concentrated samples, 2.5 mol %. The Eu3+ ions in the 0.1 mol % doped glass ceramics are diluted into like crystalline environments with higher symmetry and lower coupled phonon energy than in the precursor glasses; meanwhile in the 1 mol % doped glass ceramics the presence of EuF3 clusters has been observed in addition to diluted ions. Fluorescence line narrowing measurements indicate the presence of two main fluoride site distributions for the diluted Eu3+ ions in both glass ceramics.
The relationship between structure and transparency in glass-ceramic materials
The passive scattering losses were measured in near single-mode optical waveguide fibers with well-centered transparent glass-ceramic cores. Using difference spectra, it is shown that the incremental intrinsic losses of these glass-ceramic structures will be in the range of 100 dB/km or less. The magnitude of the scattering is discussed according to current theories.