Abstract

Superbroadband near-infrared (NIR) emission covering 1250 to $1680\mathrm{nm}$ wavelength has been obtained in praseodymium (${\mathrm{Pr}}^{3+}$) singly doped bismuth gallate glasses. The emission originates from the ${}^1{\mathrm{G}}_4\to {}^3{\mathrm{H}}_5$ and ${}^1{\mathrm{D}}_2\to {}^1{\mathrm{G}}_4$ transitions at 1330 and $1490\mathrm{nm}$ wavelengths, respectively, and is due to the extremely low phonon energy ($\sim 690{\mathrm{cm}}^{-1}$) and the unique ligand field of the glasses. It is shown that the emission line shape can be modified by adjusting the ${\mathrm{Pr}}^{3+}$ concentration and the energy transfers involved. The results confirm that other than bismuth (Bi), chromium (Cr), nickel (Ni), and other chemical elements, ${\mathrm{Pr}}^{3+}$ singly doped system is a promising alternative in achieving superbroadband NIR emission.

© 2011 Optical Society of America

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