Infrared-to-visible CW frequency upconversion in 'Er POT.3+'-doped fluoroindate glasses - Araújo, Cid B.; Menezes, L. S.; Maciel, G. S.; Acioli, L. H.; Gomes, A. S. L.; Messaddeq, Y.; Florez, A.; Aegerter, Michel André (Applied Physics Letters, 1996)