Abstract
The 2.0 μm emission properties and thermal stability of Yb–Tm–Ho triply-doped silicate glass are investigated. The characteristic temperatures, absorption spectrum and fluorescence spectra of the glasses are measured. Intensive emission near 2.0 μm is observed upon excitation at 980 nm and the corresponding mechanisms are discussed. Based on the measured absorption spectra, the absorption and emission cross sections, the Judd–Ofelt parameters and radiative properties are calculated and discussed. The predicted spontaneous transition probability for Ho 3+: 5I 7 → 5I 8 transition in silicate glass is 58.05 s −1. The results indicate that the energy transfer in Yb 3+ → Tm 3+, Yb 3+ → Ho 3+, Tm 3+ → Ho 3+ is efficient and the Yb–Tm–Ho triply-doped silicate glass is a promising 2.0 μm laser glass material.
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