Transparent Glass Ceramics Doped by Chromium(III) and Chromium(III) and Neodymium(III) as New Materials for Laser and Luminescent Solar Concentrators.
Progress rept. 1 Oct 85-31 Mar 86,
HEBREW UNIV JERUSALEM (ISRAEL) DEPT OF INORGANIC AND ANALYTICAL CHEMISTRY
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The absorption spectra of chromiumIII and nickelII at octahedral sites in a zirconium barium fluoride glass are analyzed and compared with vitreous and crystalline mixed oxides, suggesting slightly longer Cr-F and Ni-F distances than in crystalline fluorides. Laser properties of rare earth ions in fluoride glass ZBLA having composition of 57ZrF4, 34BaF2, 5LaF3, 4A1F3, or PBLA having composition of 36PbF2, 24ZnF2, 35GaF3, 3YF3, 2A1F3, for NdIII were calculated. Pumping efficiencies, lifetimes of excited and terminal levels and stimulated peak cross-sections are presented. It is shown that multiphonon relaxations in the case of energy difference less than 3000 cm-1 are always orders of magnitude lower in the fluoride glass than in the tellurite glass and the inhomogeneous width is consistently smaller in fluoride glass than in tellurite glass, which was chosen as a model for oxide glass. No significant difference was found for concentration quenching between the two kinds of glasses. Energy transfer between MnII and NdIII can increase pumping efficiencies of NdIII lasers. Keywords Israel.
- Ceramics, Refractories and Glass