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1 March 2012 A new vision of photodarkening in Yb3+-doped fibers
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Proceedings Volume 8257, Optical Components and Materials IX; 825705 (2012)
Event: SPIE OPTO, 2012, San Francisco, California, United States
Yb3+-doped fiber is one of the most promising hosts for high-power fiber lasers [1]. However, in the late 1990s, photodarkening effect, i.e., the creation of color centers induced by light, was observed and reported [2]. Like in other rare-earth-doped materials, a broad visible and near infrared absorption band appears during laser operation, which strongly lowers the laser efficiency. We have shown how thulium impurities, present at the parts-per-billion weights (ppb) level in the raw doping material, can induce UV emission which in turn creates defects responsible for photodarkening in ytterbium-doped continuous-wave fiber lasers [3]. This new vision is not in contradiction with others but it gives for the first time a possible explanation for UV defect creation by an infrared beam.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Romain Peretti, Cédric Gonnet, and Anne-Marie Jurdyc "A new vision of photodarkening in Yb3+-doped fibers", Proc. SPIE 8257, Optical Components and Materials IX, 825705 (1 March 2012);

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