Stable four-wavelength switchable narrow linewidth thulium-holmium co-doped fiber laser with a triple-coupler quadruple-ring filter
Yu, Chenhao; Xu, Darui; Yan, Fengping; Qin, Qi; Liu, Peng; Liu, Jiawen; Xu, Jianan; Guo, Hao; Cai, Yuezhi; Tan, Haoyu; Li, Ting; Feng, Ting
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