Abstract
Stimulated Brillouin scattering (SBS) management in kilowatt-level, high brightness, narrow spectral width, and all polarization-maintained amplifiers using laser gain competition is demonstrated. This method can increase the SBS threshold of the fiber amplifier by more than double without changing the linewidth. By further incorporating the phase modulation technique, the SBS threshold is scaled to be as high as 32.4 times compared to the single frequency amplification. An output power of 1082 W is achieved with a polarization extinction ratio (PER) of ∼14 dB, linewidth of <7.6 GHz and beam quality (M2 factor) of ∼M2 = 1.14 in a preliminary validation experiment. This kind of fiber source has great potential in applications of high-power coherent beam combining or spectral beam combining systems.
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