Abstract

A simple technique for selectively generating the fundamental ${\mathrm{LP}}_{01}$ and the next higher order donut-shaped ${\mathrm{LP}}_{11}$ 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 $\sim 36\mathrm{W}$ 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 ${\mathrm{LP}}_{11}$ mode.

© 2015 Optical Society of America

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