'Er POT.3+' doped 'SiO IND.2'-'GeO IND.2' waveguides from the sol-gel process and femtosecond laser - Maia, L. J. Q.; Forte, M. B.; Gonçalves, Rogéria Rocha; Messaddeq, Y.; Ribeiro, S. J. L. (Brazilian Meeting on Inorganic Chemistry (BMIC), 2008)