title: Low photo darkening single mode RMO fiber.
abstract: A new reduced mode overlap (RMO) single mode fiber design is proposed and demonstrated. For the first time saturated photo darkening operation is observed in a nominal 350 W Yb / Al co-doped silica fiber laser. After 1500 hours operation less than 7% slope efficiency degradation is found and further 500 hours operation show no degradation.
authors.affiliation: NKT Photonics A/S, Blokken 84, DK-3460 Birkerød, Denmark. KEM@nktphotonics.com
authors.forename: Kent E
authors.initials: KE
authors.lastname: Mattsson
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008962:Models, Theoretical; D055100:Optical Fibers; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D012680:Sensitivity and Specificity