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We demonstrate 810-W fundamental mode beam from Yb-doped fiber laser operating at 1092 nm. Single-transverse-mode operation is achieved through distributed mode filtering in a coiled 20-µm diameter and 0.06 NA core fiber. OCIS codes: (060.2320) Fiber optics amplifiers and oscillators; (140.3070) Infrared and far-infrared lasersUse of multimode core fibers with diffraction-limited output beams and recent advances in high power and high brightness diode lasers have led to currently occurring dramatic power increase from Yb-doped fiber lasers [1, 2]. Large size core allows to significantly reduce detrimental nonlinear effects and to raise optical damage threshold as well as to facilitate pump power coupling and efficient pump absorption in a double clad structure. As a result, fiber lasers currently represent the solid-state laser technology with the highest available powers and the best beam quality.

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