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We overcome the difficulty in realizing a monolithic waveguide-coupledmicroring laser integrated on erbium-doped thin film lithium niobate (Er: TFLN)using photolithography assisted chemo-mechanical etching (PLACE) technique. Wedemonstrate an integrated single-frequency microring laser operating around1531 nm wavelength. The PLACE technique, enabling integrated Er: TFLN photonicswith low propagation loss, can thus be used to realize low cost mass productionof monolithic on-chip microlasers with applications ranging from opticalcommunication and photonic integrated circuit (PIC) to precision metrology andlarge-scale sensing.

Monolithically integrated waveguide-coupled single-frequency microlaser on erbium-doped thin film lithium niobate