Abstract
By considering the effect of small perturbations around the zero-intensity semiclassical solution we demonstrate that there is a well-defined optical frequency (a peak in the optical power spectrum) for a single mode laser with a homogeneously broadened two-level medium operating below the lasing threshold. This frequency depends on the material and cavity decay rates, the degree of excitation of the medium, and the cavity detuning. Unlike the frequency of the lasing solution of semiclassical models for homogeneously broadened two-level media (which depends only on the decay rates and the cavity detuning and not on the degree of excitation), the frequency of subthreshold operation depends on the excitation as well, generally reaching the same frequency as for the lasing solution only at the lasing threshold.
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