摘要
分析了掺Er3+碲酸盐玻璃的热力学稳定性能,研究了掺Er3+碲酸盐玻璃的吸收和荧光光谱性质;应用Judd-Ofelt理论计算了碲酸盐玻璃中Er3+离子的强度参数Ω(Ω2=4.79×10-20cm2, Ω4=1.52×10-20cm2,Ω6=0.66×10-20cm2),计算了离子的自发跃迁几率,荧光分支比;应用McCumber理论计算了Er3+的受激发射截面(σe=10.40×10-21cm2)、Er3+离子4I13/2→4I15/2 发射谱的荧光半高宽(FWHM=65.5nm)及各能级的荧光寿命(4I13/2能级为τrad=3.99ms);比较了不同基质玻璃中Er3+离子的光谱特性,结果表明掺铒碲酸盐玻璃更适合于掺Er3+光纤放大器实现宽带和高增益放大.
Er(3+)-doped tellurite glasses with various Na(2)O/K(2)O ratios were prepared by conventional glass melting. Glass transition temperature T(g) and crystallization temperature T,, were tested by DSC. The effect of mixed alkali on thermal stability of tellurite glasses was described. The results show that the mixed alkali is beneficial to tellurite glasses on thermal stability and the best mixed alkali molar ratio is Na(2)O/K(2)O=1/4. According to absorption spectra, Judd-Ofelt intensity parameters were determined and used to calculate the radiation rates, fluorescent branch ratio and radiative lifetimes of Er(3+) in tellurite glasses. The J-O parameters were obtained, Omega(2)=4.79x 10(-20)cm(2), Omega(4)=1.52x 10(-20)cm(2), Omega(6)=0.70x 10(-20)cm(2). The stimulated emission cross sections (sigma(e)=10.40x 10(-21)cm(2)) of the Er(3+) ion 4I(13/2) ->(4)I(15/2) transition was calculated by the McCumber theory. The FWHM(FWHM=65.5nm) of the 4I(13/2) -> 4I(15/2) emission and lifetimes of every level of Er(3+) ion were measured and the lifetime of 4I(13/2) level is 3.99ms. The spectroscopic properties of Er(3+) ion were compared in different glasses. The conclusions indicate that tellurite glass is much more beneficial for optical fiber amplifier to realize broadband and high gain amplification.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第3期550-556,共7页
Journal of Inorganic Materials
基金
广东省"十五"重大科技专项项目(2002811604)广东省自然科学基金(013013)
