Fabrication of Er3+ doped tellurite whispering gallery mode microsphere laser using 0.98 μm and 1.48 μm pump lasersSnigdha Thekke Thalakkal, Davor Ristic, Daniil Zhivotkov, Gualtiero Nunzi Conti, Stefano Pelli and Mile IvandaEPJ Web Conf., 287 (2023) 05031DOI: https://doi.org/10.1051/epjconf/202328705031