Abstract
In this paper, we have numerically investigated the photodarkening induced long-term beam degradations in ytterbium doped fiber amplifiers under different fiber types, doping concentrations, pumping schemes and pumping powers. The influence of different factors on this degradation procedure was theoretically revealed. First, the coupling strength characteristics of active fibers are mainly determined by the fiber core dimension and pumping wavelength. Second, amplifiers with a stronger coupling strength will experience the degradation procedure faster than those with a weaker coupling strength. Third, the interaction length of the fiber amplifier could also affect the beam degradation process. Lastly, the more intense pumping power will enhance the degradation process. Our simulation results can provide instructive suggestions when designing ytterbium-doped fiber based fiber amplification systems.
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