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Synthesis of Nickel-doped Transparent Glass-ceramics for Ultra-broadband Optical Fiber Amplifiers
Takenobu Suzuki,Yusuke Arai,Yasutake Ohishi 한국세라믹학회 2007 세라미스트 Vol.10 No.3
The structural and optical properties of Ni-doped σansparent glass-ceramics are reviewed. The quantum efficiencies of ceramics were examined to explore suitable crystalline phase for Ni-doping in glass-ceramics. Inverse spinel LiGa5O8 have the quantum efficiency of almost 100% at room temperature. Transparent glass ceramics containing LiGa5O8 was successfully synthesized by heat treatment of LiO2-Ga2O3r-SiO2-NiO glass. Most of Ni2+ ions in glassceramic were incorporated into LiGa5O8 nanocrystals. The near-infrared emission covering from the O-band to L-band (1260-1625 nm) was observed from the Ni-doped LiO2-Ga2O3-SiO2 glass-ceramic though it was not observed from the as-cast glass. The lifetime of the emission was about 580 μsec even at 300K. The emission quantum efficiency was evaluated as about 10 % that is enough high for practical usage as gain media of optical fiber amplifiers. The figure of merit (the product of the stimulated emission cross section and lifetime) was as high as that of rare-earth-doped glasses, The broad bandwidth, high quantum efficiency and high figure of merit show that transparent glass-ceramics containing Nt2+: LiGa5O8 nanocrystals are promising candidates as novel ultra-broadband gain media.