一种新型掺铒碲酸盐玻璃的光谱性质研究

研究了一种新型掺Er³⁺碲酸盐玻璃的光谱性质；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^-20 cm²,Ω₄= 152×10^-20cm²,Ω₆=066×10^-20cm2)，计算了离子的自发跃迁概 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40×1 0^-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以及不同类型碲酸盐玻璃中Er³⁺离子的光谱 特性， 结果表明该掺铒碲酸盐玻璃具有更好的光谱性能，更适合于掺Er³⁺光纤放大 器实现宽带和高增益放大. 关键词： 碲酸盐玻璃 光谱性质 Judd-Ofelt理论}

Spectroscopic properties of new erbium-doped tellurite glass

A new Er³⁺-doped tellurite glass has been studied. According to the a bsorp tion spectrum, Judd-Ofelt intensity parameters were determined and used to calcu late the radiation rates, fluorescent branch ratio and radiative lifetimes of Er ³⁺ in Er³⁺-doped tellurite glasses. The J-O parameters wer e o btained as follows, Ω₂=479×10^-20cm²,Ω ₄=152×10 ^-20cm²,Ω₆=070×10^-20cm². The stimulated emission cross-sections (σ _e=1040×10^-21cm²)， of the Er³⁺ io n ⁴I_13/2→ ⁴I_15/2 transition was calculated using the McCumber th eory. The FWHM(FWH M=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_{1 3/2} level obtained is 399ms. The spectroscopic properties of Er³⁺ ion were compared with those in different glasses. These studies indicate that tellu rite glass is much more beneficial for optical fiber amplifiber to realize broad band and high gain amplification.