Emission properties of Ho3+ and Ho3+∕Tb3+ doped Ge30Ga2As8S60 glasses were investigated. Population densities of the I55 and I75 levels and the gain coefficients for the 1.6μm emission were calculated. Upon the addition of more than 0.05mol% Tb3+, population inversion between the I55 and I75 levels was achieved while it was not possible in the glass doped with Ho3+ only. The positive optical gain in the 1620–1750nm wavelength region was obtained with the addition of 0.3mol% Tb3+ ions.
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Lee et al. (2004) studied this question.
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