Two series of Yb<sup>3+</sup>-doped silica glasses (YA and YAP) are fabricated using the sol-gel method, and their spectroscopic properties are investigated. The longest fluorescence lifetime of 0.96 ms is obtained in YAP2 and YAP3 glasses. The emission cross-section (σ<sub>emi</sub>) and σ<sub>emi</sub> × τ of Yb<sup>3+</sup> in the YAP1 glass are 1.00 pm<sup>2</sup> and 0.94 pm<sup>2</sup>·ms, respectively. Co-doping with Al and P decreases the hydroxyl group content in the glasses because of the reduction in non-bridging oxygen content. The lowest OH content in the YAP3 glass is 9.6 ppm.
© 2012 Chinese Optics LettersPDF Article