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A model description of photo darkening of ytterbium cw fiber lasers based on long term tested fiber lasers is presented.
Photo darkening of Yb/Al co-doped silica fibres is found to saturate following prolonged exposure to pump and signal
radiation. The observed slope efficiency of Al co-doping is compared with modeled slope efficiency of P co-doping.
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Kent E. Mattsson, Jes Broeng, "Photo darkening of ytterbium cw fiber lasers," Proc. SPIE 7195, Fiber Lasers VI: Technology, Systems, and Applications, 71950V (19 February 2009); https://doi.org/10.1117/12.808216