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We use a semi-analytical model of stimulated thermal Rayleigh scattering topresent theoretical study of seed power on mode instability with the presenceof photodarkening. The behavior of mode instabilities as a function of seedpower has been investigated. The nonlinear dependence of the threshold withlower seed powers is ascribed to the influence of gain saturation while thereduction behavior of the threshold with higher seed powers is put down to theeffects of photodarkening, which agrees well with the experimental results.

Influence of seed power on mode instabilities in high power fiber amplifiers