Featured Application: The newly developed Er 3+ , Yb 3+ doped phosphate glasses presented in this paper could find many different applications in space, telecommunications, LIDAR, spectroscopy and bioimaging, just to cite a few.Abstract: New Er 3+ , Yb 3+ codoped phosphate glasses with the (98-x) (0.50P 2 O 5 -0.40SrO-0.10Na 2 O) -0.5Er 2 O 3 -1.5Yb 2 O 3 -xZnO (in mol %) composition were prepared by melting process with up to 10 mol % of ZnO. The impact of the changes in the glass composition on the thermal, optical, structural properties was investigated. Using IR and Raman spectroscopies, we confirmed that the addition of ZnO up to 10 mol % leads to a depolymerization of the network without having a significant impact on the Er 3+ and Yb 3+ sites. We also discuss the effect of alpha particles irradiation. The glass with 2.5 mol % of ZnO was irradiated with 3 MeV alpha particles and a total fluence of 10 12 α/cm 2 . After irradiation, this glass exhibits surface expansion (measured at~200 nm, 1.5 months after the irradiation) and an increase in the surface roughness. The alpha particles irradiation is suspected to lead to changes in the spectroscopic properties of the glass. Finally, the photo-response of the glass was found to be reversible.

International audienceWe demonstrate super-broad luminescence over 70 nm of bandwidth and spectral hole-burning effect obtained in just a few cm of novel air-clad, highly concentrated Er/Yb-doped phosphate fiber. The fiber is drawn from preforms of glasses within the P2O5 - SrO - Na2O composition. The fabrication process, thermal, structural, and optical properties of the fiber are described. (C) 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreemen