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A novel theoretical model for mode instability in high power fiber lasers

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We presented a coupled-mode model of mode instabilities in high power fiber lasers, which incorporated the effect of gain saturation effect. The novel model agrees well with numerical model, relative error less than 5%, and is numerically efficient. The influence of pump power/ wavelength, dopant concentration has been studied. It reveals that the maximal coupling frequency reduce along the fiber and increase with pump power, and by shifting the pump wavelength to 970nm or 985nm, the threshold power can be increased by 40% or 80% compared with that of 976nm, respectively. The results agree with the experimental results.

© 2014 Optical Society of America

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