Waveguide amplifiers in rare-earth doped glasses : fabrication, characterisation [MATH] modelling B. HYDE, D. BARBIER, J. HUBNER, J.-M. JOUANNO, A. KEVORKIAN et A. LUPASCU J. Phys. IV France, 04 C4 (1994) C4-277-C4-280 DOI: 10.1051/jp4:1994468