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Driven by narrow-linewidth bench-top lasers, coherent optical systemsspanning optical communications, metrology and sensing provide unrivalledperformance. To transfer these capabilities from the laboratory to the realworld, a key missing ingredient is a mass-produced integrated laser withsuperior coherence. Here, we bridge conventional semiconductor lasers andcoherent optical systems using CMOS-foundry-fabricated microresonators withrecord high $Q$ factor over 260 million and finesse over 42,000. Fiveorders-of-magnitude noise reduction in the pump laser is demonstrated, and forthe first time, fundamental noise below 1 Hz$^2$ Hz$^{-1}$ is achieved in anelectrically-pumped integrated laser. Moreover, the same configuration is shownto relieve dispersion requirements for microcomb generation that havehandicapped certain nonlinear platforms. The simultaneous realization ofrecord-high $Q$ factor, highly coherent lasers and frequency combs usingfoundry-based technologies paves the way for volume manufacturing of a widerange of coherent optical systems.

Hertz-linewidth semiconductor lasers using CMOS-ready ultra-high-$Q$ microresonators