Cr4+-doped silica optical fibres: absorption and fluorescence properties V. Felice, B. Dussardier, J. K. Jones, G. Monnom and D. B. Ostrowsky Eur. Phys. J. AP, 11 2 (2000) 107-110 Published online: 15 August 2000 DOI: 10.1051/epjap:2000151