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Abstract
Yb3+ and Er3+ co-doped SrLaGa3O7 (abbr. as Yb,Er: SLGO) bulk crystal with dimensions of Φ 20×30mm was grown successfully by the Czochralski (Cz) method. The absorption and fluorescence spectra as well as the fluorescence decay curves of Yb,Er: SLGO crystal were measured and investigated. The emission cross-section and fluorescence lifetimes have been obtained at the ~2.7µm wavelength. Based on Yb3+-Er3+ energy level diagrams, the rate equation model was built and discussed. It is found that 2.7–3.0µm emission has been improved in Yb,Er: SLGO crystal under excitation of 980nm, owing to the sensitization of the co-dopant Yb3+ and the resonant energy transfer from Yb3+ to Er3+. A noteworthy result is that Yb,Er: SLGO crystal is an excellent mid-infrared laser gain material.
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