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A laser consisting of two independently-pumped resonators can exhibit modebifurcations that evolve out of the exceptional points (EPs) of the linearsystem at threshold. The EPs are non-Hermitian degeneracies occurring at theparity/time-reversal ($\mathcal{PT}$) symmetry breaking points of the thresholdsystem. Above threshold, the EPs become bifurcations of the nonlinearzero-detuned laser modes, which can be most easily observed by making the gainsaturation intensities in the two resonators substantially different. Smallpump variations can then switch abruptly between different laser behaviors,e.g. between below-threshold and $\mathcal{PT}$-broken single-mode operation.

Laser Mode Bifurcations Induced by $\mathcal{PT}$-Breaking Exceptional Points