LUMINESCENCE AND FLUORESCENCE LINE NARROWING STUDIES OF CHROMIUM DOPED GLASS F.J. Bergin, J.F. Donegan, T.J. Glynn and G.F. Imbusch J. Phys. Colloques, 46 C7 (1985) C7-337-C7-341 DOI: 10.1051/jphyscol:1985761