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12 March 2019 Kilowatt-level, high brightness, narrow-linewidth PM fiber amplifiers based on laser gain competition
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Abstract
Stimulated Brillouin scattering (SBS) management in kilowatt level, high brightness, narrow spectral width, and all polarization-maintained amplifiers by using laser gain competition is demonstrated. This method can increase the SBS threshold of the fiber amplifier by more than twice without changing the linewidth. By further incorporating phase modulation technique, the SBS threshold is scaled to be as high as 32.4 times compared with single frequency amplification. Output power of 1082 W is achieved with 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 the applications of high power coherent beam combining (CBC) or spectral beam combining (SBC) systems.
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Daren Meng, Pengfei Ma, Xiaolin Wang, Yanxing Ma, Rongtao Su, Pu Zhou, and Lijia Yang "Kilowatt-level, high brightness, narrow-linewidth PM fiber amplifiers based on laser gain competition", Proc. SPIE 11023, Fifth Symposium on Novel Optoelectronic Detection Technology and Application, 110233B (12 March 2019); https://doi.org/10.1117/12.2517299
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