title: Local structure analyses around Er(3+) in Er-doped fibers with Al co-doping.
abstract: The local structure around Er(3+) in Er-doped optical fiber (EDFs) was explored by X-ray absorption fine structure (XAFS) measurements. Using several new approaches such as a novel sample preparation, we successfully measured the XAFS. The intensities near the 8.36 keV peaks were observed for the first time using X-ray Absorption Near Edge Structure (XANES) analysis. The intensities increased in the order of Er, Er(2)O(3), and EDF samples, indicating that Er(3+) in the EDFs existed as an oxide state. Extend X-ray Absorption Fine Structure (EXAFS) analysis also showed that the oxygen coordination number of Er(3+) increased as the Al concentration increased and that the Er-O distances of EDF with Al co-doping is longer than that of EDF without Al co-doping.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Haruna
authors.forename: Junji
authors.initials: J
authors.lastname: Iihara
authors.forename: Koji
authors.initials: K
authors.lastname: Yamaguchi
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Saito
authors.forename: Shinji
authors.initials: S
authors.lastname: Ishikawa
authors.forename: Masashi
authors.initials: M
authors.lastname: Onishi
authors.forename: Takahiro
authors.initials: T
authors.lastname: Murata