We center our attention in the tellurite glasses doped with rare-earth ions (REIs) and their optical properties that are widely in optical devices, since the REIs should ideally be confined as a delta function in the center of the core for maximum gain per unit pump power. In this manner there is a trade-off between the confinement and the high RE ion concentration.
Bibliographical noteFunding Information:
This work was financially supported by the Brazilian agencies FAPESP, CNPq, and CEPOF/INOF. V.A.G. Rivera thanks to FAPESP for financial support (project 2009/08978-4 and 2011/21293-0) that allowed my post-doctoral.
© 2017, Springer International Publishing AG.