On-chip tunable microdisk laser fabricated on Er-doped lithium niobate on insulator.

We demonstrate a C-band wavelength-tunable microlaser with an -doped high quality (∼1.8×10) 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 ∼-17.03/ at low pump power below 13 mW, and 10.58 pm/mW at high pump power above 13 mW.