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The generation of very narrow linewidth light sources is of great importancein modern science. One such source is the superradiant laser, which relies oncollectively interacting ultra long lived dipoles driven by incoherent light.Here we discuss a different way of generating spectrally pure light bycoherently driving such dipoles inside an optical QED cavity. The light exitingthe cavity carries information about the detuning between the driving light andthe atomic transition, but is also affected by the noise originating from allthe decoherence processes that act on the combined atom-cavity system. Wecalculate these effects to obtain fundamental limits for frequency estimationand stabilization across a range of values of input light intensities andatom-light interaction strengths, estimate these limits in state-of-the-artcavity experiments with alkaline-earth atoms and identify favorable operatingconditions. We find that the achievable linewidths are comparable to those ofthe superradiant laser.

Ultra Narrow Linewidth Frequency Reference via Measurement and Feedback