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Ultra-low-noise laser sources are crucial for a variety of applications,including microwave synthesizers, optical gyroscopes, and the manipulation ofquantum systems. Silicon photonics has emerged as a promising solution forhigh-coherence applications due to its ability to reduce system size, weight,power consumption, and cost (SWaP-C). Semiconductor lasers based onself-injection locking (SIL) have reached fiber laser coherence, but typicallyrequire a high-Q external cavity to suppress coherence collapse throughfrequency-selective feedback. Lasers based on external-cavity locking (ECL) area low-cost and turnkey operation option, but their coherence is generallyinferior to SIL lasers. In this work, we demonstrate quantum-dot (QD) lasersgrown directly on Si that achieve SIL laser coherence under turnkey ECL. Thehigh-performance QD laser offers a scalable and low-cost heteroepitaxialintegration platform. Moreover, the QD laser's chaos-free nature enables a 16Hz Lorentzian linewidth under ECL using a low-Q external cavity, and improvesthe frequency noise by an additional order of magnitude compared toconventional quantum-well lasers.

Turnkey locking of quantum-dot lasers directly grown on Si