Populations and Emission Properties of the 5I6 and 5I7 Levels in Ho3+ Doped into PbO–Bi2O3–Ga2O3 Glasses |
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| Authors: | Jong Heo Kee Youn Kim Yong Kon Kwon |
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| Affiliation: | Department of Materials Science and Engineering, Center for Information Materials, Pohang University of Science and Technology (POSTECH), Pohang, South Korea |
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| Abstract: | Emission properties of PbO–Bi2O3–Ga2O3 glasses doped with Ho3+ were investigated for fiber-optic amplification at the 1.18 μm wavelength region. When the glasses were doped with Ho3+ ions only, there was a weak emission at 1.18 μm with a lifetime of ～200 μs. However, when Yb3+ ions were codoped, the lifetime of the 1.18 μm emission increased to 630 μs together with a significant increase in intensity. A similar enhancement in the intensity and lifetimes was realized for the 2.05 μm emission. These effects are due to energy transfer from the Yb3+:2F5/2 to the Ho3+:5I6 level. Devitrification of the ternary PbO–Bi2O3–Ga2O3 glasses was efficiently suppressed by adding 10 mol% GeO2. Optimum Ho3+ concentration was ～0.4 mol%, whereas Yb3+ ions can be added up to the solubility limit. |
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