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21 May 2012 Experimental and theoretical studies of phase modulation in Yb-doped fiber amplifiers
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We present detailed studies of the effect of sinusoidal phase modulation on stimulated Brillouin scattering (SBS) in ytterbium-doped fiber amplifiers. Based on a time-dependent SBS model, SBS enhancement factor versus pump linewidth for different modulation depths ranging from 0 to π , and modulation frequencies ranging from 30 MHz to 500 MHz were analyzed. In addition, experimental validation of SBS suppression via sinusoidal phase modulation is presented with experimental results agreeing well with the model and simulations. Furthermore, narrow linewidth coherent beam combining (CBC) of 5 sinusoidal phase modulated lasers is demonstrated via LOCSET.
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Angel Flores, Chunte Lu, Craig Robin, Shadi Naderi, Christopher Vergien, and Iyad Dajani "Experimental and theoretical studies of phase modulation in Yb-doped fiber amplifiers", Proc. SPIE 8381, Laser Technology for Defense and Security VIII, 83811B (21 May 2012);

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