• High Power Laser Science and Engineering
  • Vol. 9, Issue 2, 02000e23 (2021)
Xin Zhang1, Shoufei Gao2, Yingying Wang2, Wei Ding2, and Pu Wang1、*
Author Affiliations
  • 1National Center of Laser Technology, Institute of Laser Engineering, Beijing University of Technology, Beijing100124, China
  • 2Institute of Photonics Technology, Jinan University, Guangzhou510632, China
  • show less

    Abstract

    High-power fiber lasers have experienced a dramatic development over the last decade. Further increasing the output power needs an upscaling of the fiber mode area, while maintaining a single-mode output. Here, we propose an all-solid anti-resonant fiber (ARF) structure, which ensures single-mode operation in broadband by resonantly coupling higher-order modes into the cladding. A series of fibers with core sizes ranging from 40 to 100 μm are proposed exhibiting maximum mode area exceeding 5000 μm2. Numerical simulations show this resonant coupling scheme provides a higher-order mode (mainly TE01, TM01, and HE21) suppression ratio of more than 20 dB, while keeping the fundamental mode loss lower than 1 dB/m. The proposed structure also exhibits high tolerance for core index depression.
    \begin{align}{n}_{\mathrm{eff}}={n}_m-\frac{1}{2}{\left(\frac{u_{nm}}{\pi \sqrt{n_m}}\right)}^2\cdotp {\left(\frac{\lambda }{d_{\mathrm{eff}}}\right)}^2,\end{align}((1))

    View in Article

    \begin{align}\frac{d}{D}=\frac{u{}_\mathrm{11\cdot ARE}}{u_\mathrm{01\cdot core}}\cdot \frac{e_\mathrm{c\cdot core}}{e_\mathrm{c\cdot ARE}}.\end{align}((2))

    View in Article