碱金属和碱土金属氟化物对掺Er3+氟磷酸盐玻璃光谱性质的影响

研究了碱金属和碱土金属离子修饰的掺Er^３＋氟磷酸盐玻璃的光谱性质，讨论 了碱金属和碱土金属对铒氟磷玻璃的吸收和发射截面、荧光半高宽，Judd-Ofelt强度参数和 上转换发光强度等光谱性质的影响，并与一些传统氧化物玻璃系统进行了比较.研究表明碱 金属K^＋和碱土金属Sr^２＋掺杂高的玻璃更适宜用作光放大器基质. 含12mol％K^＋的氟磷玻璃展现出7.83×10^-21cm^２的高 发射截面和最小的荧光上转换强度；含23mol％Sr^２＋的氟磷玻璃则有7.58×10 ^-21cm^２的高发射截面、65nm的荧光半高宽及8.6ms的长的上能级荧 光寿命. 关键词： 氟磷酸盐玻璃 光谱性质 Judd-Ofelt参数 光学放大器

Spectroscopic properties of Er3+-doped alkaline/alkaline-earth metal modified fluorophosphate glasses

This paper reports the spectroscopic properties of Er^３＋-doped Al(PO _３)₃-based fluorophosphate glasses for 1.5μm optical ampl ifiers. Effects of alkaline/alkaline-earth metal composition on the spectroscopi c properties of Er^３＋ in fluorophosphate glasses are investigated. A strong correlation between the alkaline/alkaline-earth metal content and the s pectroscopic parameters, such as absorption and emission cross sections, Judd-Of elt intensity parameters and upconversion emission intensity, has been observed. The fluorophosphate glass with 12 mol% potassium fluoride exhibits the largest calculated stimulated-emission cross-section of 7.83×10^-21cm^{２< /sup> and the smallest upconversion emission intensity among the fluorophosphate studied. The fluorophosphate glass with 23 mol% strontium fluoride has a broadb and near-infrared emission at 1.5μm with a full width at half-maximum over 65nm and a long upper level fluorescence lifetime of 8.6ms.}