Abstract: | The advent of high-Q optical microcavity systems is giving birth to new technologies and phenomena derived from the control of Brillouin scattering. After a brief overview, the generation of highly coherent light in Brillouin microlaser systems will be examined. Beginning with fundamental limits to laser coherence caused by microwave-rate thermomechanical quanta, the demonstration of sub-Hertz Schawlow-Townes linewidths in chipbased Brillouin lasers is discussed. Application of these systems for highly stable microwave generation and rotation sensing is then described
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