掺铒碲酸盐玻璃的热力学稳定性和光谱性质的研究

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^-20_cm2),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(σ_e=10.40×10^-21cm²)、Er³⁺离子⁴I_13/2→⁴I_15/2 发射谱的荧光半高宽(FWHM=65.5nm)及各能级的荧光寿命(⁴I_13/2能级为τ_rad=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.

Thermal Stability and Spectroscopic Properties of Erbium-doped Tellurite Glass

Er³⁺-doped tellurite glasses with various Na₂O/K₂O ratios were prepared by conventional glass melting. Glass transition temperature T_g and crystallization temperature T_x 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 Na₂O/K₂O=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 Er3+ in tellurite glasses. The J-O parameters were obtained, Ω₂=4.79×10^-20cm², Ω4=1.52×10^-20cm², Ω₆=0.70×10^-20cm². The stimulated emission cross sections (σ_e=10.40×10^-21cm²) of the Er³⁺ ion ⁴I_13/2→⁴I_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 Er³⁺ ion were measured and the lifetime of ⁴I_13/2 level is 3.99ms. The spectroscopic properties of Er³⁺ 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.