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摘要
In this work, the near-infrared photoluminescence properties in Tm3+/Ho3+ co-doped tellurite glass was investigated. The tellurite glass with composition TeO2-ZnO-Na2O-La2O3 was synthesized using conventional melt quenching technique and characterized by UV/Vis/NIR absorption and near-infrared emission spectroscopies, fluorescence decay measurement and differential scanning calorimeter (DSC) analysis. Under the excitation of 808 nm laser diode (LD), a broadband 2.0 inn band luminescence ranging from 1600 to 2200 nm with a full width at half maximum (FWHM) of 362 nm was observed, which was contributed by 1.85 pm fluorescence from Tm3+: F-3(4) -> H-3(6) and 2.05 pm fluorescence from Ho3+: I-5(7) -> I-5(8). The fluorescence emission of Ho3+ was originated from the energy transfer from Tm3+ to Ho3+ ions, and the energy transfer mechanism was elucidated by analyzing fluorescence decay behavior of Tm3+ and quantitative calculation of phonon contribution joined in the energy transfer process. Meanwhile, based on the absorption spectrum, some important spectroscopic parameters such as Judd-Ofelt intensity parameter, spontaneous radiative transition probability, fluorescence branching ratio, absorption and emission cross-sections, and gain coefficient spectrum were calculated to reveal the spectroscopic properties of doped tellurite glass. Furthermore, from the DSC curve it can be derived that the investigated glass possesses a good thermal stability with Delta T( = T-x - T-g) larger than 152 degrees C. These results indicate that Tm3+/Ho3+ co-doped tellurite glass could be a promising gain medium applied for 2.0 mu m near infrared band broad fiber amplifiers and tunable fiber lasers.
- 出版日期2018-2-1
- 单位宁波大学
