RELAXATION OF HIGH LYING EXCITED STATES OF Nd3+ IONS IN YAG : Nd3+ AND IN YAP : Nd3+ M.F. JOUBERT, J.C. COUDERC et B. JACQUIER J. Phys. IV France, 01 C7 (1991) C7-385-C7-389 DOI: 10.1051/jp4:19917100