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Microsoft Word - PW09_7195-0R_Koponen_Copyright. docx ABSTRACT Photodarkening is a detrimental phenomenon known to affect ytterbium doped fibers Methods to study the spectral and temporal properties of the photodarkening induced loss were developed
Photodarkening in Ytterbium doped silica fibers under 488 nm CW . . . An Yb-doped phosphosilicate fiber was observed to be highly resistant to photodarkening Photodarkening results in several aluminosilicate fibers with varied Yb-doping concentration were compared Effects of external heating, during and after 488 nm CW irradiation, were investigated
Photodarkening in ytterbium-doped silica fibers - Academia. edu The relations between dopant concentrations (phosphorus and aluminum) and photodarkening rate, excess loss, and activation energies in ytterbium-doped silica fibers are experimentally investigated
Photodarkening in ytterbium-doped silica fibers | (2005) - SPIE This paper presents a simple method to characterize photodarkening in both single-mode and double clad Yb-doped fibers A short length of fiber is pumped using high brightness source in order to achieve high and uniform inversion
MEASURING PHOTODARKENING FROM Yb DOPED FIBERS Silica optical fibers typically consist of a doped glass core, a silica cladding, and a second (outer) cladding surrounding the silica cladding The glass core has the highest refractive index in order to enable single- or multimode light propagation, while the cladding refractive index is lower
Photodarkening-Induced Absorption and Fluorescence Changes in Yb Fibers Abstract We study the photodarkening effect in a double clad ytterbium-doped silica fiber fabricated by modified chemical vapor deposition and solution doping A common measurement technology for photodarkening is used to study the photodarkening-induced absorption spectra
Photodarkening rate in ytterbium doped silica fibers This paper was published in the proceedings of SPIE Photonics West 2006, Lasers and Applications in Science and Technology, and is made available as an electronic preprint with permission of SPIE