【摘要】 以铋硅酸盐玻璃（SiO₂-Bi2O₃-BaF₂-AlPO₄）为基质,通过掺杂Ho³⁺、Tm³⁺、Yb³⁺稀土离子,制备激光波长为2μm的光纤激光器。对玻璃的声子能量、物理和光学性能进行了研究,确定基质配方为50SiO₂-40Bi₂O₃-5BaF₂-5AlPO₄（SBBA,其中化学式前的系数为对应物质的摩尔分数,下同）。在玻璃基质中分别掺杂0.5Ho₂O₃-2.0Yb₂O₃（HY）、0.5Ho₂O₃-0.5Tm₂O₃-2.0Yb₂O₃（0.5HTY）及0.75Ho₂O₃-0.75Tm₂O₃-3.0Yb₂O₃（0.75HTY）,研究了980nm激发波长下样品的吸收、发射光谱和Judd-Oflet理论光谱参数。研究发现SBBA-0.75HTY中Ho³⁺的吸收截面、发射截面（σem）、FWHM（半峰宽）×σem数值最大,分别为7.38×10^-21、10.54×10^-21 cm²和19.71×10^-26 cm³。掺入Tm₂O₃改善了玻璃激光器性能,且当Yb³⁺/Tm³⁺/Ho³⁺物质的量之比一定时,增加稀土离子含量,可加强红外发光及增益效果。更多还原

【Abstract】 Fiber laser in 2μm spectral region can attach great importance,not only on health care,but also in laser radar,air monitoring and other fields such as environmental pollution.Due to its important application in the medical field,fiber laser in 2μm spectral region opened the floodgates to new research.Compared to other glass matrixes,silicate glass has low cost,good chemical stability,but high phonon energy,high melting temperature,low rare earth ion solubility,difficult to realize miniaturization of equipment and other shortcomings.The introduction of bismuth oxide in silicate glass Bi₂O₃,can reduce the phonon energy,melting temperature and increase the solubility of rare earth ions.Meanwhile,the O—H in the glass hosts can be removed with increasing concentration of fluorine ions in the glass,and thus improve 2μm infrared luminous performance.Therefore bismuth silicate glass is considered as an ideal near-mid-infrared light-emitting material.The bismuth silicate glass SiO₂-Bi₂O₃-BaF₂-AlPO₄ doped with Ho³⁺/Tm³⁺/Yb³⁺is prepared by high-temperature melt-quenching method.Compared with physical properties,phonon energy and optical performance,50SiO₂-40Bi₂O₃-5BaF₂-5AlPO₄（SBBA）is the appropriate glass host.The spectroscopic properties of bismuth silicate exited by 980 nm laser diode were investigated.The Judd-Ofelt parameters and radiative lifetime of Ho³⁺in SBBA doped with 0.5Ho₂O₃-2.0Yb₂O₃（HY）,0.5Ho₂O₃-0.5Tm₂O₃-2.0Yb₂O₃（0.5 HTY）,0.75Ho₂O₃-0.75Tm₂O₃-3.0Yb₂O₃（0.75 HTY）respectively,were calculated based on the absorption spectra.The maximal absorption and emission cross sections（σem）of Ho³⁺are 7.38×10^-21,10.54×10^-21 cm²,respectively,while the largest FWHM×σemachieves 19.71×10^-26 cm³ in SBBA-0.75 HTY.The results of fluorescence spectra suggest more efficient application in 2μm fiber lasers of Ho³⁺,Tm³⁺and Yb³⁺co-doped bismuth silicate than Ho³⁺and Yb³⁺co-doped bismuth silicate.SiO₂-Bi₂O₃-BaF₂-AlPO₄ doped with Ho³⁺/Tm³⁺/Yb³⁺can attach better infrared light-emitting performance and gain effect with high doping concentration in a fixed ratio of rare earth ions.更多还原