7 March 2014 Raising the mode instability thresholds of fiber amplifiers
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Abstract
We use our numerical model of mode instability to analyze the influences of spontaneous thermal Rayleigh scattering (sTRS) and laser gain saturation on instability threshold powers. sTRS is stronger than the quantum noise used as the seed power for stimulated thermal Rayleigh scattering in previous studies, so the threshold is reduced by 15-25% with sTRS seeding. Gain saturation is strong in any efficient amplifier and we show how it can be exploited to raise instability thresholds be a factor of two or more while staying below the stimulated Brillouin threshold.
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Arlee V. Smith, Arlee V. Smith, Jesse J. Smith, Jesse J. Smith, } "Raising the mode instability thresholds of fiber amplifiers", Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 89611S (7 March 2014); doi: 10.1117/12.2037097; https://doi.org/10.1117/12.2037097
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