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Liu, Jun, Shi Chen, Hongya Wang, Shuang Zheng, Long Zhu, Andong Wang, Lulu Wang, Cheng Du, and Jian Wang. "Amplifying Orbital Angular Momentum Modes in Ring-Core Erbium-Doped Fiber." Research (Wash D C) 2020.

Liu, Jun, et al. "Amplifying Orbital Angular Momentum Modes in Ring-Core Erbium-Doped Fiber." Research (Wash D C) 2020.