title: Spectral properties of Er3+/Yb3+ codoped tungsten-tellurite glasses.
abstract: The spectral properties of Er3+/Yb3+ codoped tungsten-tellurite (WT) glasses have been investigated. The measured absorption spectra are analyzed by Judd-Ofelt theory. The compositional change of intensity parameter omega2 is attributed to the change in the covalency between the Er3+ and oxygen ions, the asymmetry in the local structures around the Er3+ ions can be neglected. The lifetimes of 4I(13/2) level of Er3+ in WT glasses are measured and comparable with other TeO2-based glasses. The stimulated emission cross-section is calculated based on McCumber theory. The fluorescence full width at half maximum (FWHM) and the emission cross-section (sigma(peak)) of the 4I(13/2) --> 4I(15/2) transition of Er3+ in different glass hosts have been compared. The suitability of such WT glasses as host materials for 1.5 microm broadband amplification is discussed.
authors.affiliation: Faculty of Information Science and Engineering, Ningbo University, Zhejiang 315211, China. shenxiang.nbu@hotmail.com
authors.forename: Xiang
authors.initials: X
authors.lastname: Shen
authors.forename: QiuHua
authors.initials: Q
authors.lastname: Nie
authors.forename: TieFeng
authors.initials: T
authors.lastname: Xu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Gao
mesh_terms: D002412:Cations / Q000737:chemistry; D004871:Erbium / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D013057:Spectrum Analysis; D013691:Tellurium / Q000737:chemistry*; D014414:Tungsten / Q000737:chemistry*; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D002412:Cations; D004871:Erbium; C026660:tellurous acid; D015018:Ytterbium; D013691:Tellurium; D014414:Tungsten