On-chip tunable single-mode high-power narrow-linewidth Fabry–Perot microcavity laser on Yb³⁺-doped thin-film lithium niobate

Ytterbium ion (Yb³⁺)-doped lasers are widely used in precision machining and precision measurement fields because of their high efficiency and high power, which are primarily based on solid-state lasers and fiber lasers. Here, we demonstrate an on-chip Yb³⁺-doped thin-film lithium niobate (Yb:TFLN) Fabry–Perot microcavity laser. We achieve single-frequency laser operation at 1030 and 1060 nm with a side-mode suppression ratio above 30 dB, an emission linewidth below 40 pm, and an output power up to 1.5 mW at 1060 nm and 0.3 mW at 1030 nm. In addition, using the electro-optic effect of lithium niobate, we achieve a laser tuning efficiency of 4 pm/V. This work opens the path to on-chip high-power and mode-locked ultrafast laser output.