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The stimulated Brillouin scattering(SBS) threshold enhancement factor in a pure white noise linewidth broadening Yb-doped fiber amplifier(YDFA) with a short large mode area fiber is theoretically and experimentally studied.We demonstrate a 1064.08 nm,11.6 GHz linewidth,1.5kW output power YDFA with an SBS threshold enhancement of ~57(26 W SBS threshold with single frequency seed).The output beam is near-diffraction limited with a beam quality factor of M~2 = 1.15 and a slope efficiency of up to 87%.No SBS or stimulated Raman scattering effects are observed in the whole power range.Further power scaling is limited by the available pump power in our system.
The stimulated Brillouin scattering (SBS) threshold enhancement factor in a pure white noise linewidth broadening Yb-doped fiber amplifier (YDFA) with a short large mode area fiber is theoretically and experimentally studied. We demonstrate a 1064.08 nm, 11.6 GHz linewidth, 1.5 kW output power of YDFA with an SBS threshold enhancement of -57 (26 W SBS threshold with single frequency seed). The output beam is near-diffraction limited with a beam quality factor of M ~ 2 = 1.15 and a slope efficiency of up to 87% .No SBS or stimulated Raman scattering effects are observed in the whole power range. Further power scaling is limited by the available pump power in our system.