掺铒钨碲酸盐玻璃光谱性质的研究

STUDY ON SPECTROSCOPIC PROPERTIES OF Er^(3+)-DOPED TUNGSTENTELLURITE GLASS

研究了掺铒钨碲酸盐玻璃的吸收光谱和荧光光谱。应用JuddOfelt理论计算了Er3+的光谱强度参数Ωt(t=2,4,6)、自发辐射跃迁几率、荧光分支比和辐射寿命。从光谱强度参数的计算说明掺铒钨碲酸盐玻璃中Er—O键的共价性强于碲酸盐玻璃中Er—O键的共价性。玻璃的荧光半高宽为52nm,大于Er3+在磷酸盐和硅酸盐玻璃中的荧光半高宽。应用McCumber理论,计算了钨碲酸盐玻璃中Er3+离子在峰值波长1532nm的受激发射截面,为0.91×10-20cm2,大于Er3+在碲酸盐玻璃中的受激发射截面0.75×10-20cm2。由于掺铒钨碲酸盐玻璃的玻璃转变温度高、有较大的声子能量、较宽的荧光半高宽和较大的受激发射截面,是制作高增益的光波导放大器的理想材料。

Erbium ion-doped tungsten-tellurite glass was fabricated and characterized by absorption spectrum and fluorescence spectrum. The intensity parameters Ωt(t = 2,4,6), spontaneous radiative transition rate, fluorescence branching ratio and radiative lifetime of each energy level of Er3+ were calculated from the absorption spectrum by the Judd-Ofelt theory. The calculation results of spectroscopic intensity parameters show that the covalency of Er-O bond in Er3+-doped tungsten-tellurite glass is stronger than that of Er-O bond in tellurite glass. The fluorescence full width at half maximum of 52 nm is larger than that of Er3+ in phosphate and silicate glass. The stimulated emission cross section of Er3+ in tungsten-tellurite glass at 1 532 nm calculated from McCumber theory is 0.91 × 10-20 cm2, which is larger than that of 0.75 × 10-20 cm2 for Er3+ in tellurite glass. Er3+-doped tungsten-tellurite glass has higher glass transition temperature, higher phonon energy, broader fluorescence full width at half maximum and larger stimulated emission cross section, so it is an ideal host material for the fabrication of high gain Er3+-doped waveguide amplifier.