Abstract

Near-infrared and mid-infrared (MIR) ultrabroad emission bands were observed in as-grown and annealed ${\mathrm{Bi}}_2{\mathrm{O}}_3\text{-}{\mathrm{GeO}}_2$ binary glasses, in the wavelength ranges of 1000–1800 nm and 1800–3020 nm, respectively. The MIR emission band could appear through high doping ratio of ${\mathrm{Bi}}_2{\mathrm{O}}_3$ or annealing process in air atmosphere. The structure of these glasses, the transformation of emission centers, and the effect of Al ions doping have been discussed, with the conclusion that the ${\mathrm{Bi}}_2{\mathrm{O}}_3\text{-}{\mathrm{GeO}}_2$ binary glasses could be a promising laser material.

© 2012 Optical Society of America

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