Abstract

A simple technique for selectively generating the fundamental LP01 and the next higher order donut-shaped LP11 mode with vortex phase front in a cladding-pumped few-moded ytterbium-doped fiber laser is reported. Our approach exploits the difference in polarization behavior of individual transverse modes due to transverse variation of birefringence in a few-mode fiber allowing robust mode discrimination through the use of an appropriately aligned intracavity polarizing element. The laser yielded 36W of output power for both transverse modes with corresponding slope efficiency of 74% with respect to absorbed pump power and a mode purity of 98% for the donut-shaped LP11 mode.

© 2015 Optical Society of America

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