FLUORESCENCE DYNAMICS AND ENERGY TRANSFER PROCESSES IN VARIOUS SOLID-STATE LASER MATERIALS BASED ON Er3+ AND Tm3+ IONS C. LI, J.-C. SOURIAU and R. MONCORGE J. Phys. IV France, 01 C7 (1991) C7-371-C7-374 DOI: 10.1051/jp4:1991797