Abstract

Large mode area (LMA) fibers are widely used in high-power fiber lasers to solve the nonlinear problems. In this Letter, a novel LMA fiber with heterogeneous helical claddings (HHCs) is proposed. A coordinate transformation simulation technique is adopted to analyze the fiber mode transmission characteristics. The effects of the fiber parameters such as $\theta ,\;\Lambda ,\;r,\;{n_0},\;{n_1},\;{n_2},\;{n_3}$, and $\lambda$ on the mode transmission characteristics include loss coefficient $L$ and effective mode area ${A_{\rm{eff}}}$. When $\theta = {14}^\circ$, $\Lambda = {22}\;{\rm mm}$, ${n_0} = {n_2} = {1.439}$, and ${n_1} = {n_3} = {1.438}$ are adopted. The loss coefficients are ${L_{01}} = {0.093}\;{\rm dB/m}$, ${L_{11}} = {9.47}\;{\rm dB/m}$, and ${L_{21}} = {23.36}\;{\rm dB/m}$; the single-mode fiber diameter ${2}r$ is at least 60 µm; and the corresponding effective mode field area ${A_{\rm{eff}}}$ is ${2025}\;\unicode{x00B5}{\rm m}^2$. As the helix pitch is a centimeter order of magnitude and the fiber is all solid state, the HHC fiber is relatively easy to fabricate and convenient for cutting, splicing, etc., and will be well applied in the field of high-power fiber lasers.

© 2021 Optical Society of America

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