The spectroscopic properties of Ni~(2+)-doped nanocrystalline glass-ceramic fibers are reported. The cerammed fibers show strong fluorescence with peak wavelength at 1250 nm, 3-dB bandwidth at ～250 nm, measured lifetimes at >1 ms, and low-fluorescence saturation powers (～35 mW) for 980-nm diode pumping. Current diode-pumped output powers are ～100 μW.
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