Abstract
Oxyfluoride glasses, 30.9SiO 2–15.5AlO 1.5–30.9PbF 2–22.7CdF 2–1.5TmF 3– xHoF 3 ( x = 0.1 , 1 , 1.5 ) (mol %), were prepared by traditional melt-quenching method. By appropriate heat treatment of the precursor glasses as described above, transparent glass ceramics were obtained with β - PbF 2 nano-crystals embedded in glassy matrix as confirmed by X-ray diffraction analysis. Optical absorption and 2.0 μm emission properties of the precursor glass and glass ceramic samples have been studied. Rare-earth ions were confirmed to enter into nano-crystals, by absorption spectra. The emission intensity in 2.0 μm region increased several times after crystallization, due to shortened distance between codopants and low phonon energy of the β - PbF 2 nano-crystals. Of the investigated samples, glass ceramic sample containing 1.5 mol% TmF 3 and 0.1 mol% HoF 3 has the broadest and the most efficient emission in 2.0 μm region. The Tm 3+/Ho 3+codoped oxyfluoride glass ceramics show potential applications in 2.0 μm laser devices.
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