Preparation and spectra properties of BaO-Al₂O₃-P₂ O₅-Sm₂O₃ system protection glasses

The forming-regions of phosphate glasses doped with high Sm₂O₃ contents were studied by two step melting method. The relationship between absorption spectrum and rare earth contents was also discussed. The spectra of BASP glasses were measured by spectrophotometer. The results show that the forming regions will shrink with the increase of Al₂O₃ and it is difficult to form glass when [PO₄]/[AlO₄] <2. The forming regions tend to be a closed elliptical, and the intensity of characteristic absorption peak increases gradually with the increase of Sm₂O₃, the absorption lines broadens non-uniformly and there is approximate linear relation between optical density at the 1064 nm wavelength and Sm₂O₃ content.