title: Spectroscopic properties of Er(3+)/Yb(3+) co-doped Bi(2)O(3)-B(2)O(3)-GeO(2) glasses.
abstract: Er(3+)/Yb(3+) co-doped 60Bi(2)O(3)-(40 - x)B(2)O(3)-xGeO(2) (BBG; x=0, 5, 10, 15 mol%) glasses that are suitable for fiber lasers, amplifiers have been fabricated and characterized. The absorption spectra, emission spectra, and lifetime of the (4)I(13/2) level and quantum efficiency of Er(3+):(4)I(13/2) --> (4)I(15/2) transition were measured and calculated. With the substitution of GeO(2) for B(2)O(3), both Delta lambda(eff) and sigma(e) decrease from 75 to 71 nm and 9.88 to 8.12 x 10(-21) cm(2), respectively. The measured lifetime of the (4)I(13/2) level and quantum efficiency of Er(3+):(4)I(13/2) --> (4)I(15/2) transition increase from 1.18 to 1.5 ms and 36.2% to 43.2%, respectively. The emission spectra of Er(3+):(4)I(13/2) --> (4)I(15/2) transition was also analyzed using a peak-fit routine, and an equivalent four-level system was proposed to estimate the stark splitting for the (4)I(15/2) and (4)I(13/2) levels of Er(3+) in the BBG glasses. The results indicate that the (4)I(13/2) --> (4)I(15/2) emission of Er(3+) can be exhibit a considerable broadening due to a significant enhance the peak A, and D emission.
authors.affiliation: Faculty of Information Science and Engineering, The State Key Laboratory Base of Novel Functional Materials and Preparation Science, Ningbo University, Zhejiang 315211, PR China. diroice@163.com
authors.forename: Xudong
authors.initials: X
authors.lastname: Zhang
authors.forename: Tiefeng
authors.initials: T
authors.lastname: Xu
authors.forename: Qiuhua
authors.initials: Q
authors.lastname: Nie
authors.forename: Shixun
authors.initials: S
authors.lastname: Dai
authors.forename: Xiang
authors.initials: X
authors.lastname: Shen
authors.forename: Xianghua
authors.initials: X
authors.lastname: Zhang
mesh_terms: D001729:Bismuth; D002516:Ceramics / Q000737:chemistry*; D003300:Copper; D003460:Crystallization; D005063:Europium; D005857:Germanium; D005898:Glass; D006860:Hydrogen Bonding; D008674:Metals, Rare Earth / Q000737:chemistry*; D008958:Models, Molecular; D011789:Quantum Theory; D013055:Spectrophotometry, Infrared; D015018:Ytterbium
chemical_list: C522494:Bi2O3-B2O3-GeO2 glass; D008674:Metals, Rare Earth; D005857:Germanium; D005063:Europium; D003300:Copper; D015018:Ytterbium; D001729:Bismuth