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We demonstrate an ultralow-noise microrod-resonator based laser thatoscillates on the gain supplied by the stimulated Brillouin scattering opticalnonlinearity. Microresonator Brillouin lasers are known to offer an outstandingfrequency noise floor, which is limited by fundamental thermal fluctuations.Here, we show experimental evidence that thermal effects also dominate theclose-to-carrier frequency fluctuations. The 6-mm diameter microrod resonatorused in our experiments has a large optical mode area of ~100 {\mu}m$^2$, andhence its 10 ms thermal time constant filters the close-to-carrier opticalfrequency noise. The result is an absolute laser linewidth of 240 Hz with acorresponding white-frequency noise floor of 0.1 Hz$^2$/Hz. We explain thesteady-state performance of this laser by measurements of its operation stateand of its mode detuning and lineshape. Our results highlight a mechanism fornoise that is common to many microresonator devices due to the inherentcoupling between intracavity power and mode frequency. We demonstrate theability to reduce this noise through a feedback loop that stabilizes theintracavity power.

A microrod-resonator Brillouin laser with 240 Hz absolute linewidth