Mr. Abraham Taliaferro Profile

Abraham Taliaferro

at Leidos Inc

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Proceedings Article | 5 March 2021 Presentation + Paper

SBS suppression techniques in high-power, narrow-linewidth fiber amplifiers

Brian Anderson, Kenneth MacDonald, Abraham Taliaferro, Angel Flores

Proceedings Volume 11665, 116650G (2021) https://doi.org/10.1117/12.2588427

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Stimulated Brillouin scattering (SBS) is typically the lowest order nonlinearity encountered in ytterbium doped fiber amplifiers (YDFA), and the simplest means of suppressing it is though linewidth broadening from phase modulation. However, to maintain compatibility with beam combining techniques critical to scaling to high output powers, narrow linewidths are needed, and bandwidth efficient means of suppressing SBS are key to scaling to high powers. Here, the scalability of novel phase modulation techniques in combination with laser gain competition are explored. Ultimately, LGC is shown to improve the TMI threshold by 15%, and reduce the linewidth by a factor of 2.1. A 1.8 kW fiber amplifier with 7 Ghz linewidth is demonstrated.

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