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

C.-H. Liu and A. Galvanauskas

EECS Department, University of Michigan, 1301 Beal Avenue, Ann Arbor, MI 48109-2122 Phone: (734)615-7166; fax: (734)763-4876; e-mail: liuch@engin.umich.edu

B. Ehlers Fraunhofer USA, Center for Laser Technology, 46025 Port Street, Plymouth ,MI 48170

Abstract: 

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.