title: Absorption and emission analysis of RE3+(Sm3+ and Dy3+): lithium boro tellurite glasses.
abstract: This paper reports on the development and spectral analysis of Sm3+ (1.0%) and Dy3+ (1.0%) doped lithium-boro-tellurite glasses. A bright orange (4G5/2-->6H7/2) along with a red (4G5/2-->6H9/2) and a yellow (4G5/2-->6H5/2) emission transition have been measured from Sm3+ doped lithium-boro-tellurite glass. Both blue (4F9/2-->6H15/2) and yellow (4F9/2-->6H13/2) emission bands have been obtained from Dy3+ glass. From the measured decay profiles, the lifetimes of the emissions of the Sm3+ glass (4G5/2-->6H5/2, 7/2, 9/2 and 11/2) at an excitation of 401 nm have been found to be in the range 0.47-0.81 ms, and with respect to the Dy3+ emissions (4F9/2-->6H15/2 and 13/2), with excitation at 450 nm, are measured to be in the range of 0.302-0.307 ms. Stimulated emission cross-sections (sigmapE) of the measured emission transitions have also been computed and the values are in the range of (0.38-1.20) x 10(-20) cm2 for Sm3+ and for Dy3+ doped lithium-boro-tellurite glass the values are (0.66-1.39) x 10(-20) cm2.
authors.affiliation: FEUP-Faculdade de Engenharia da Universidade do Porto, DEMM, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
authors.forename: N
authors.initials: N
authors.lastname: Sooraj Hussain
authors.forename: G
authors.initials: G
authors.lastname: Hungerford
authors.forename: R
authors.initials: R
authors.lastname: El-Mallawany
authors.forename: M J M
authors.initials: MJ
authors.lastname: Gomes
authors.forename: M A
authors.initials: MA
authors.lastname: Lopes
authors.forename: Nasar
authors.initials: N
authors.lastname: Ali
authors.forename: J D
authors.initials: JD
authors.lastname: Santos
authors.forename: S
authors.initials: S
authors.lastname: Buddhudu