Abstract

We self-injection-lock a diode laser to a 1.41 m long, ultra-high $Q$ integrated resonator. The hybrid integrated laser reaches a frequency noise floor of ${0.006}\;{\rm{H}}{{\rm{z}}^2}/{\rm{Hz}}$ at 4 MHz offset, corresponding to a Lorentzian linewidth below 40 mHz—a record among semiconductor lasers. It also exhibits exceptional stability at low-offset frequencies, with frequency noise of ${{200}}\;{\rm{H}}{{\rm{z}}^2}/{\rm{Hz}}$ at 100 Hz offset. Such performance, realized in a system comprised entirely of integrated photonic chips, marks a milestone in the development of integrated photonics; and, for the first time, to the best of our knowledge, exceeds the frequency noise performance of commercially available, high-performance fiber lasers.

© 2021 Optical Society of America

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