Non-equilibrium mode competition in a pumped dye-filled cavity
arXiv:2109.02988 · doi:10.1103/PhysRevA.104.063709
Abstract
We consider a homogeneously pumped photon gas coupled to a dye medium and investigate how its steady state is effected when varying the pump power, the photon cavity lifetime and the cutoff frequency. We study how the interplay between pumping, loss, and dye-induced thermalization influences the selection of the cavity modes that acquire large occupation. Depending on the parameter regime, the latter can be related either to lasing of (typically multiple) modes or to equilibrium-like photon condensation in the ground mode. We calculate and explain the phase diagram of the system, with a particular emphasis on the role played by a mode repulsion that occurs in the regime of weak cavity loss.
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