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Yb3-doped Te02-W03-Li20, Te02-W03-BaO, Te02-W03-La203, Te07-W03-Bi203, and Te02-W03-Nb705 glasses havebeen prepared. Then absorption and emission properties of Yb3 in these glasses have been investigated. Both the reciprocitymethod and F-L equation were employed to calculate the emission cross section. It is found that the Yb3-doped ternarytungsten tellurite glasses possess excellent absorption and emission properties, and show good promise as I .02 im lasersource.Keywords: Yb3-doped, tungsten-tellurite glasses 1. INTRODUCTION Crystals and glasses doped with trivalent ytterbium ions exhibit highly efficient emission using lnGaAs laser diodes as pumpsource. Yb3 has ground configuration of 4f'3. Because there are only two manifolds in the Yb3 energy level scheme, the 2F712 ground state and the 2F512 excited state, concentration quenching and multiphonon relaxation should not affect the lasing or the excitation wavelengths"2. The Yb3 ion media are of interest in lasers for next generation nuclear fusion3'4 and appearsas a good candidate as a pump source for Pr3 58 whereas ytterbium-doped silica fiber lasers 5,6,8,9 and fluoride fiber lasers7 have been extensively investigated and applied, other ytterbium-doped glasses fiber laser have been received less attention,and the main investigation has generally focused on the compositional dependence of absorption and fluorescence of Yb3 in |
