摘要
制备了Er3 +/Yb3 +共掺的碲钨酸盐玻璃样品,TeO2-WO3-RmOn(RmOn=PbO,BaO,La2O3,Bi2O3),研究了样品的热稳定性和1.5μm波段的光谱性质。碲酸盐中引入WO3的目的是为提高基质的声子能量,使Er3 +离子4I13/2→4I15/2的多声子弛豫速率增加,从而提高4I13/2能级上的Er3 +离子数,这对提高1.5μm处的荧光强度有利,另外加入WO3也能提高碲酸盐玻璃的抗析晶能力。测试了样品的FT-IR光谱,发现碲钨酸盐玻璃样品中存在着TeO4、TeO3、WO4和WO6结构体。周围环境的不对称性导致Er3 +在1.5μm处的光谱有非均匀的展宽和大的受激发射截面。Er3 +在70TeO2-20WO3-10Bi2O3玻璃中4I13/2→4I15/2能级发射的荧光半峰全宽(FWHM)为77 nm,应用McCumber理论计算的受激发射截面(σpeak)为1.03×10-20cm2。其FWHM×σpeak乘积远大于掺Er3 +的铋酸盐、磷酸盐、碲酸盐和硅酸盐玻璃,说明碲钨酸盐玻璃是一种制备宽带光纤放大器优良基质材料。
Er^3＋/Yb^3＋ codoped tungsten-tellurite （WT） glasses, TeO2-WO3-RmOn （RmOn=PbO, BaO, La2O3, Bi2O3 ）, were prepared and investigated. WO3 has been introduced in the tellurite glasses due to the following two reasons： The first one is to increase the phonon energy and the multi-phonon relaxation rate of the Er^3＋ ：^4I1/2→^4I13/2 transition, which benefits the population inversion between the ^4I13/2 and %4I15/2 level of Er^3＋. The second is to enhance the thermal stability against crystallization. The structural studies were done through FT-IR spectral analysis and revealed that these glasses contain TeO4, TeO3, WO4 and WO6 units as the local structures. The asymmetry of Er^3＋ sites results in inhomogeneous broadening of spectra and large emission cross-section at 1.5 p,m band. The fluorescence full width at half maximum FWHM =77 nm, and the peak of the emission cross-section σpeak = 1.03×10^-20 cm^2 are manifested in 70TeO2-20WO3-10Bi2O3 glass. The gain bandwidth properties FWHM×σpeak, of Er^3＋ in WT glasses have advantages over those of bismuthate, phosphate, tellurite and silicate glasses, indicating the WT glasses are promising host materials for 1.5μm broadband amplification.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2006年第1期36-40,共5页
Chinese Journal of Luminescence
基金
国家自然科学基金(60272034)
浙江省自然科学基金(Y104498)
浙江省科技厅项目(2005C31014)
宁波大学校基金(200586, 2005859)资助项目~~
