Enhanced 1.8 μm emission in Er³⁺/Tm³⁺ co-doped lead silicate glasses under different excitations for near infrared laser

朱婷婷^1,2,3，唐国武^1,2,3，陈晓东^1,2,3，孙敏^1,2,3，钱奇^1,2,3，杨中民^1,2,3

1. State Key Laboratory of Luminescent Materials and Devices, Institute of Optical Communication Materials, South China University of Technology2. Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, South China University of Technology3. Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology

摘 要：A detailed study of the fluorescence emission properties and energy transfer mechanism in Er³⁺/Tm³⁺ co-doped lead silicate glasses was reported. Enhanced near infrared 1.8 μm and visible up-conversion emissions were investigated under 808 and 980 nm excitations, respectively. The energy transfer mechanism between Er³⁺ and Tm³⁺ was analyzed according to the absorption spectra, the emission spectra and the level structures of Er³⁺ and Tm³⁺. The energy transfer efficiency between Er³⁺ and Tm³⁺ reached 68.1% in the Er³⁺/Tm³⁺ co-doped lead silicate glasses when pumped by 808 nm laser diode. Based on the absorption spectra, the Judd-Ofelt parameters, spontaneous emission probability, absorption and emission cross sections, gain coefficients were calculated and analyzed. It was found that the calculated emission cross section and the maximum gain coefficient around 1.8 μm were 4.9×10^–21cm² and 1.12 cm^–1, respectively. These results indicated that the Er³⁺/Tm³⁺ co-doped lead-silicate glasses had potential application in near infrared lasers.

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