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Photonically integrated resonators are promising as a platform for enablingultranarrow linewidth lasers in a compact form factor. Owing to their smallsize, these integrated resonators suffer from thermal noise that limits thefrequency stability of the optical mode to ~100 kHz. Here, we demonstrate anintegrated stimulated Brillouin scattering (SBS) laser based on a largemode-volume annulus resonator that realizes an ultranarrowthermal-noise-limited linewidth of 270 Hz. In practice, yet narrower linewidthsare required before integrated lasers can be truly useful for applications suchas optical atomic clocks, quantum computing, gravitational wave detection, andprecision spectroscopy. To this end, we employ a thermorefractive noisesuppression technique utilizing an auxiliary laser to reduce our SBS laserlinewidth to 70 Hz. This demonstration showcases the possibility of stabilizingthe thermal motion of even the narrowest linewidth chip lasers to below 100 Hz,thereby opening the door to making integrated microresonators practical for themost demanding future scientific endeavors.

Cooling of an Integrated Brillouin Laser below the Thermal Limit