Increasing mode instability thresholds of fiber amplifiers by gain saturation.

@article{Smith2013IncreasingMI,
  title={Increasing mode instability thresholds of fiber amplifiers by gain saturation.},
  author={Arlee V. Smith and Jesse J. Smith},
  journal={Optics express},
  year={2013},
  volume={21 13},
  pages={15168-82}
}
We show by numerical modeling that saturation of the population inversion reduces the stimulated thermal Rayleigh gain relative to the laser gain in large mode area fiber amplifiers. We show how to exploit this effect to raise mode instability thresholds by a substantial factor. We also demonstrate that when suppression of stimulated Brillouin scattering and the population saturation effect are both taken into account, counter-pumped amplifiers have higher mode instability thresholds than co… CONTINUE READING
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