Generating visible light with wide tunability and high coherence based on photonic integrated circuits is of high interest for applications in biophotonics, precision metrology, and quantum technology. Here we present, to our knowledge, the first demonstration of a hybrid-integrated diode laser in the visible spectral range. Using an AlGaInP optical amplifier coupled to a low-loss S i 3 N 4 feedback circuit based on microring resonators, we obtain a spectral coverage of 10.8 nm around 684.4 nm wavelength with up to 4.8 mW output power. The measured intrinsic linewidth is 2.3 ± 0.2 k H z .

Hybrid integration of diode amplifiers with Si3N4 feedback circuits offers wide tuning and high frequency stability on short timescales. We improve long-term stability, for the first time, by locking the laser frequency to an acetylene absorption line.

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