Abstract
We propose a few-mode erbium-ring-doped fiber laser with high slope efficiency towards an individual transverse vector mode output. Based on the rate equation, specific transverse vector mode output is achieved through numerical investigations of the position and the thickness of the transverse erbium-doped region. Our results show that a thinner erbium-doped region is favorable for increasing the number of available output transverse vector mode, and the position selects desired transverse vector mode to excite. Moreover, high-order vector modes up to the third-order can be excited with appropriate erbium-doped locations. The laser output using the proposed method has merit of high slope efficiency and high mode purity. The slope efficiency and the mode purity can reach 61.25% and 99.99%, respectively. Our work may find potential applications in high-power lasers and high-order transverse mode operation of fiber lasers.
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