title: Temporal evolution and correlation between cooperative luminescence and photodarkening in ytterbium doped silica fibers.
abstract: The present work describes photodarkening from the viewpoint of cooperative luminescence. The temporal evolution of both effects was measured simultaneously by means of ytterbium doped aluminosilicate fibers for concentrations up to 1.8 wt% Yb3+. The quadratic dependence of photodarkening and cooperative luminescence versus dopant concentration was observed. The change in the photodarkening and cooperative luminescence mutual dynamics for highly and low doped fibers is ascribed to a different ion number which forms the cluster. Cooperative luminescence is proved to be a natural probe for photodarkening since it provides new pieces of information and contributes to the photodarkening mechanism description.
authors.affiliation: College of Engineering, Swansea University, Singleton Park, Swansea, UK. h.gebavi@swansea.ac.uk
authors.forename: Hrvoje
authors.initials: H
authors.lastname: Gebavi
authors.forename: Stefano
authors.initials: S
authors.lastname: Taccheo
authors.forename: Daniel
authors.initials: D
authors.lastname: Milanese
authors.forename: Achille
authors.initials: A
authors.lastname: Monteville
authors.forename: Olivier
authors.initials: O
authors.lastname: Le Goffic
authors.forename: David
authors.initials: D
authors.lastname: Landais
authors.forename: David
authors.initials: D
authors.lastname: Mechin
authors.forename: Denis
authors.initials: D
authors.lastname: Tregoat
authors.forename: Benoit
authors.initials: B
authors.lastname: Cadier
authors.forename: Thierry
authors.initials: T
authors.lastname: Robin
mesh_terms: D000042:Absorption; D005336:Fiber Optic Technology / Q000379:methods*; D049449:Luminescence; D008163:Luminescent Measurements / Q000379:methods*; D012822:Silicon Dioxide / Q000737:chemistry*; D013223:Statistics as Topic; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D012822:Silicon Dioxide; D015018:Ytterbium