COMPARATIVE STUDIES OF Er 3+ IONS IN LiNbO 3 WAVEGUIDES PRODUCED BY DIFFERENT METHODS. - DIEROLF, V.; MORGUS, T.; SANDMANN, C.; CANTELAR, E.; CUSSO, F.; CAPEK, P.; SPIRKOVA, J.; POLGAR, K.; SOHLER, W.; OSTENDORF, A. (Radiation Effects & Defects in Solids, 2003)