Ultra-compact all-fiber narrow-linewidth single-frequency blue laser at 489nmYang Changsheng; Huang Zhenpeng; Deng Huaqiu; Zhao Qilai; Zhang Yuning; Gan Jiulin; Cheng Huihui; Feng Zhouming; Peng Mingying; Yang Zhongmin; Xu ShanhuiSCI-摘要-关键词-