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We demonstrate a C-band wavelength-tunable microlaser with an Er3+ doped highquality (~1.02x10^6) lithium niobate microdisk resonator. With a 976 nmcontinuous-wave pump laser, lasing action can be observed at a pump powerthreshold as low as ~250 {\mu}W at room temperature. Furthermore, the microdisklaser wavelength can be tuned by varying the pump laser power, showing a tuningefficiency of ~-17.03 pm/mW at low pump power blow 13 mW, and 10.58 pm/mW athigh pump power above 13 mW.

An on-chip tunable micro-disk laser fabricated on Er3+ doped lithium niobate on insulator (LNOI)