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On-chip tunable microdisk laser fabricated on Er3+-doped lithium niobate on insulator

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Abstract

We demonstrate a C-band wavelength-tunable microlaser with an ${{\rm Er}^{3 +}}$-doped high quality (${\sim}{1.8} \times {{10}^6}$) lithium niobate microdisk resonator. With a 976 nm continuous-wave pump laser, lasing action can be observed at a pump power threshold lower than 400 µW at room temperature. Furthermore, the microdisk laser wavelength can be tuned by varying the pump laser power, showing a tuning efficiency of ${\sim}- {17.03}\;{\rm pm/mW}$ at low pump power below 13 mW, and 10.58 pm/mW at high pump power above 13 mW.

© 2021 Optical Society of America

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