850 nm Upconversion Lasing in $\mathsf{Er^{+3}}$ Doped Z.B.L.A. FibersA. Saissy, E. Maurice, G. Monnom, S. Staroske et G. BaxterJ. Phys. III France, 5 3 (1995) 297-306DOI: https://doi.org/10.1051/jp3:1995126
