Multiphoton absorption in Er3+ doped fibres Y. OUERDANE, A. BOUKENTER, M. BOUDERBALA, P. OTTAVI, M. DRUETTA, E. MAURICE et G. MONNOM J. Phys. IV France, 04 C4 (1994) C4-491-C4-494 DOI: 10.1051/jp4:19944118