Abstract
Firstly, the purpose and significance for studying rare earth doped high power fiber laser are introduced. Then, the task of this dissertation has been proposed on the basic of foregoing studies. In section 2,experiment procedure and measurement are introduced are introduced in details. After that, the calculation for the absorption cross section (σabs), stimulated emission cross section（σemi）,radiation decay rate（Arad）,and the potential laser performance parameters （βmin, Isat and Imin）are expatiated. In section3，investigate the Yb2O3 and PbO’s contents infection to the physical and spectroscopy properties of Yb3+-doped multi-component silicate glasses.As a result, with the increase of Yb3+ concentration from 0.5mol% to 2mol%, in 1020 nm ,the peak absorption cross section decreases from 1.81 pm2 to 0.29pm2 . Therefore, high doping is impossible.In SAL glasses .with the increase of YbO concentration, the wavelength of peak absorption moves to longer wavelength. However, theσabs2 andσemi2 have no obvious change. with the increase of Yb3+ concentration, the absorption cross section(σabs) is not changed.This indicates that cluster effect of Yb3+ ions in SPB is very small. Laser parmeter accounts Yb-doped SPB glasses’s SFL gene is 0.63.It’s bigger than Hoya company’s Yb3+-doped PNK glasses in Japan and Yb3+-doped QX glasses in America. Therefore, SPB glasses is good for high Yb-doped.
Keywords: Yb3+ ions silicate glasses physical and spectroscopic properties
