17 May 2010 Novel oxyfluoride glass and transparent glass-ceramics for fiber lasers and fiber amplifiers
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Transparent glass-ceramics containing nano-crystals were prepared by controlled heat-treatment of conventionally melt-quenched NaF-YF3-Al2O3-SiO2 oxyfluoride glass. The precipitated crystallites were composed of only cubic NaYF4 and the average diameter was estimated as less than 10 nm from the X-ray diffraction analysis. The crystallites were so small that the transparency of the glass was kept after crystallization. NaYF4 has a crystal structure of a fluorite type that cation sites were randomly occupied by Na+ and Y3+. It is expected that the Y3+ sites can be substituted to other rare-earth ions which have the similar ionic radii. We have been prepared Tb3+ and Yb3+ co-doped glass and glass-ceramics. Green fluorescence was observed when the glass and glass-ceramics were excited by a 974 nm laser. The up-conversion intensity was enhanced by the crystallization.
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Takenobu Suzuki, Takenobu Suzuki, Shin-ichiro Masaki, Shin-ichiro Masaki, Kento Mizuno, Kento Mizuno, Yasutake Ohishi, Yasutake Ohishi, } "Novel oxyfluoride glass and transparent glass-ceramics for fiber lasers and fiber amplifiers", Proc. SPIE 7721, Solid State Lasers and Amplifiers IV, and High-Power Lasers, 77210T (17 May 2010); doi: 10.1117/12.854090; https://doi.org/10.1117/12.854090


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