Structure-Dependent Spectroscopic Properties of Yb 3+ -Doped Phosphosilicate Glasses Modified by SiO 2

摘要

Yb 3+ -doped phosphate glasses containing different amounts of SiO 2 were successfully synthesized by the conventional melt-quenching method. The influence mechanism of SiO 2 on the structural and spectroscopic properties was investigated systematically using the micro-Raman technique. It was worth noting that the glass with 26.7 mol % SiO 2 possessed the longest fluorescence lifetime (1.51 ms), the highest gain coefficient (1.10 ms·pm 2 ), the maximum Stark splitting manifold of 2 F 7/2 level (781 cm ?1 ), and the largest scalar crystal-field N J and Yb 3+ asymmetry degree. Micro-Raman spectra revealed that introducing SiO 2 promoted the formation of P=O linkages, but broke the P=O linkages when the SiO 2 content was greater than 26.7 mol %. Based on the previous 29 Si MAS NMR experimental results, these findings further demonstrated that the formation of [SiO 6 ] may significantly affect the formation of P=O linkages, and thus influences the spectroscopic properties of the glass. These results indicate that phosphosilicate glasses may have potential applications as a Yb 3+ -doped gain medium for solid-state lasers and optical fiber amplifiers.