Emission properties of 2.0 μm fluorescence and the energy transfer between Ho 3+ and Tm 3+ in 57PbO·25Bi 2 O 3 ·18Ga 2 O 3 (mol%) glass codoped with Ho 3+ and Tm 3+ were investigated. Cross‐relaxation rates in Tm 3+ increased approximately 5 times when the Tm 2 O 3 concentration was increased from 1.0 to 1.5 wt%. Coefficients of the forward Tm 3+ → Ho 3+ energy transfer were about 15 times larger than those of the Tm 3+ ← Ho 3+ backward transfer. Analysis of the energy transfer and gain spectra indicated that the highest gain at the 2.0 μm wavelength region could be achieved from the glass with 1.5 wt% of Tm 2 O 3 and 0.3 wt% of Ho 2 O 3 .
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Shin et al. (2000) studied this question.
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