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R. Imamura, S. Fujii, TSLP Suzuki, R. Suzuki, R. Ishida, M. Ito, H. Maki, L. Yang, and T. Tanabe, “Fabrication of Er-doped microresonator for on-chip mode-locked laser with CNT as saturable absorber,” The 8th Advances Lasers and Photon Sources Conference (ALPS'19), ALPS-15-04, Yokohama, April 22-25 (2019).