Ultrabroad near-infrared (NIR) photoluminescence from ${\mathrm{Ni}}^{2+}$-centers in nanocrystalline Ba-Al titanate glass ceramics was studied by temperature-dependent static and dynamic photoluminescence spectroscopy in the regime of 10 to 300 K. Photoluminescence covers the spectral range of about 1100 nm to $>1600\mathrm{nm}$ with a typical bandwidth (FWHM) greater than 300 nm. For UV-LED excitation at 352 nm, an internal quantum efficiency of 65% is obtained. The excited state lifetime $\tau$ at room temperature is 39 μs. The stimulated emission cross section ${\sigma }_{\mathrm{em}}$ is $8.5\times {10}^{-20}{\mathrm{cm}}^2$, resulting in a practical figure of merit, ${\sigma }_{\mathrm{em}}*\tau$, of $3.3\times {10}^{-24}{\mathrm{cm}}^2\mathrm{s}$ at room temperature. These properties suggest suitability as a broadband gain medium for tunable lasers and optical amplifiers.

© 2012 Optical Society of America

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