Up-conversion and excited state absorption studies of Nd3+ doped Y3Al5O12, YLiF4 and LaMgAl11O19 Y. GUYOT, H. MANAA, R. MONCORGÉ, N. GARNIER, E. DESCROIX and P. LAPORTE J. Phys. IV France, 04 C4 (1994) C4-529-C4-532 DOI: 10.1051/jp4:19944127