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Title:Temperature Dependence of Oxygen Deficiency Centers in Glass Optical Fiber Probed by Ultraviolet Absorption and Photoluminescence Spectroscopy
Author(s):Liu, Yuh-Shiuan
Contributor(s):Dragic, Peter D.
Subject(s):optical fiber
glass optical fibers
temperature dependence
oxygen deficiency centers
ultraviolet absorption
Abstract:UV absorption measurements in the vicinity of 248 nm ( hw = 5 eV) on Yb-- doped optical fiber as a function of temperature are presented. We find that the cladding absorption of Yb--doped fiber increases with the temperature of the fiber under test, which indicates that, within the range of 5 degrees C to ~90 degrees C, the adsorption strength of oxygen C, the absorption strength of oxygen deciency centers (ODCs) is linearly proportional to the temperature. Thus, if we operate the fiber laser at "low" temperature, we potentially reduce the photodarkening rate. Furthermore, the photoluminescence measurements of ODCs at both room temperature (T = 300 K) and liquid nitrogen temperature (T = 77 K) are presented. We find that the visible emission band of ODCs disappears; on the other hand, the photoluminescence of Yb3+ increases significantly. Thus, a new energy level diagram for ODCs in Yb-doped silica fiber is proposed in this work.
Issue Date:2012-05
Publication Status:unpublished
Peer Reviewed:not peer reviewed
Date Available in IDEALS:2014-01-09

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