Electronic polarizability and optical parameters of Er3+/Yb3+ co-doped phosphate glasses

Feng Song; Chengguo Ming; Wentao Wang; Lanjun Luo

doi:10.1117/12.841144

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25 February 2010 Electronic polarizability and optical parameters of Er³⁺/Yb³⁺ co-doped phosphate glasses

Feng Song, Chengguo Ming, Wentao Wang, Lanjun Luo

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Proceedings Volume 7598, Optical Components and Materials VII; 75981P (2010) https://doi.org/10.1117/12.841144
Event: SPIE OPTO, 2010, San Francisco, California, United States

Abstract

The samples of Er³⁺/Yb³⁺ co-doped phosphate glasses with different Er³⁺ doped concentrations were prepared by high-temperature melting method. By calculating the electronic polarizabilities and optical basicity of the samples, we find, with the increasing of Er³⁺ ions concentration, the polarizability and optical basicity of oxide ions become large, which indicates that the covalence of the glasses becomes small. Based on Judd-Ofelt (J-O) theory, the J-O intensity parameters Ω_λ (λ=2,4,6), spontaneous radiative lifetime, and fluorescence branching ratio were calculated. With the increasing of Er³⁺ concentration, the Ω₂ values are decrease gradually, which also proves that the covalence of the glasses becomes small. The ratios of Ω₄/Ω₆ are within the range of 7.51-9.84, which are larger. Thereby, our glasses are suitable laser materials. We also studied the upconversion (UC) emission of the samples. The strong 657 nm red emission, 546 nm and 523 nm green emissions were observed under 975 nm laser diode (LD) excitation. The UC emission intensities depend on the ratio of Er³⁺/Yb³⁺. When the ratio is 0.125, the emissions are strongest. The emission cross sections of UC emissions were analyzed using McCumber theory and Füchtbauer Ladenburg (FL) method. The emission cross section of UC red emission is larger (about 0.5×10^-20cm²),which proves our samples are better red light materials.

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Feng Song, Chengguo Ming, Wentao Wang, and Lanjun Luo "Electronic polarizability and optical parameters of Er³⁺/Yb³⁺ co-doped phosphate glasses", Proc. SPIE 7598, Optical Components and Materials VII, 75981P (25 February 2010); https://doi.org/10.1117/12.841144

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