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Highly stable laser sources based on narrow atomic transitions provide apromising platform for direct generation of stable and accurate opticalfrequencies. Here we investigate a simple system operating in thehigh-temperature regime of cold atoms. The interaction between a thermalensemble of $^{88}$Sr at mK temperatures and a medium-finesse cavity producesstrong collective coupling and facilitates high atomic coherence which causeslasing on the dipole forbidden $^1$S$_0 \leftrightarrow ^3$P$_1$ transition. Weexperimentally and theoretically characterize the lasing threshold andevolution of such a system, and investigate decoherence effects in anunconfined ensemble. We model the system using a Tavis-Cummings model, andcharacterize velocity-dependent dynamics of the atoms as well as the dependencyon the cavity-detuning.

Lasing on a narrow transition in a cold thermal strontium ensemble