Maximizing the mode instability threshold of a fiber amplifier
Arlee V. Smith, Jesse J. Smith
TL;DR
This paper demonstrates through numerical modeling how to maximize the mode instability threshold in high power fiber amplifiers by controlling seed modulation, launch conditions, and considering effects like photodarkening.
Contribution
It introduces a detailed numerical model showing how to enhance the mode instability threshold by specific control strategies and analyzing the effects of photodarkening and mode loss.
Findings
Eliminating seed and pump modulation increases threshold
Careful seed launch improves stability
Photodarkening and mode loss influence the threshold
Abstract
We show by detailed numerical modeling that stimulated thermal Rayleigh scattering can account for the modal instability observed in high power fiber amplifiers. Our model illustrates how the instability threshold power can be maximized by eliminating amplitude and phase modulation of the signal seed and the pump, and by careful launch of the signal seed. We also illustrate the influence of photodarkening and mode specific loss on the threshold.
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