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Disordered laser gain media : Er3+ doped CaGdAlO4 and Ca3Ga2Ge4O14

Wells, Jon-Paul R. and Han, Thomas P.J. and Yamaga, Mitsuo and Kodama, Nobuhiro and Gallagher, Hugh G. (2000) Disordered laser gain media : Er3+ doped CaGdAlO4 and Ca3Ga2Ge4O14. Journal of Luminescence, 87–89. pp. 1093-1095. ISSN 0022-2313

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Abstract

We report on the optical spectroscopy of trivalent erbium ions doped into compositionally disordered oxide host materials, CaGdAlO4 and Ca3Ga2Ge3O14. In either material, averaged spectral linewidths of close to 40 cm-1 are measured to be concentration independent up to 5 mol% of the dopant ion. For laser excitation resonant with the 4I15/24F9/2 and 4I13/24F5/2 and 4F3/2 transitions, intense blue and green upconversion fluorescence is observed. Dips in the upconversion excitation spectra are attributable to radiative energy transfer (or self-absorption) which is known to enhance energy storage and upconversion.