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A spectral singularity is a mathematical notion with an intriguing physicalrealization in terms of certain zero-width resonances. In optics it manifestsas lasing at the threshold gain. We explore the application of theirrecently-developed nonlinear generalization in the study of the effect of anonlinearity on the lasing threshold condition for an infinite planar slab ofgain medium. In particular, for a Kerr nonlinearity, we derive an explicitexpression for the intensity of the emitted waves from the slab and discuss theimplications of our results for the time-reversed system that acts as acoherent perfect absorber.

Nonlinear Spectral Singularities and Lasing Threshold Condition