Enhanced 3 μm emission in Ho3+/Yb3+co-doped bismuth-fluoride glasses by Gd2O3

In this work, (100-b)(45Bi2O3-40GeO2-15BaF2)-bGd2O3-2Yb2O3-0.5Ho2O3 glass was prepared to use a hightemperature melting method(where b= 0, 2.5, 5, 7.5, 10). The absorption and fluorescence spectra indicate that the optimal Gd2O3 content is 7.5 mol% (BGBG7.5HY), with an Omega 2 value of 6.20x10- 20 cm2 for the main glass, which is superior to that of BGBG0HY glass. This suggests that the incorporation of Gd2O3 enhances the mid-infrared emission capacity. Raman spectroscopy studies demonstrate that the introduction of Gd2O3 results in a substantial influx of oxygen atoms into the glass network, accompanied by a transition of [BiOS] to [BiO3] within the glass mesh. This is evidenced by a notable redshift of the characteristic peaks at 509 cm- 1 and 677 cm-1 in comparison to BGB glass. The introduction of Gd2O3 also expands the distance between Ho3+/Yb3+ ions, inhibits rare earth ion clusters, improves the Ho3+ luminescence center environment, and thus enhances the 3 mu m emission performance of bismuth fluoride glass. The maximum emission cross section is 1.82 x 10-20 cm2 and the maximum gain coefficient is 3.71 cm- 1. The results show that the bismuth fluoride glass prepared in this paper is an excellent gain material for mid-infrared fiber lasers.