High power 30-µm core helically coiled Yb-fiber laser with diffraction limited and linearly polarized output

We demonstrate up to 155-W of cw power from a high-birefringence (PANDA) multimode-core (30-µm diameter) Yb-doped fiber laser producing diffraction-limited (M2 = 1.32) and linearly-polarized output, using helically-coiled sections as mode filters at fiber ends.