DBR waveguide lasers made in lithium niobate

Single-frequency laser emission at 1561 nm was achieved in the first distributed-Bragg-reflector (DBR) waveguide lasers fabricated in erbium-diffusion-doped lithium niobate (LiNbO3). Developed jointly at the Paul Scherrer Institute (Zurich, Switzerland) and the Universität-GH Paderborn (Germany), the device is reportedly an important ste¥toward making complex integrated optical circuits in LiNbO3. Fabrication consisted of a 35-mm-long gain section made by planar erbium-diffusion doping,