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We explore the consequences of the emergence of linear and nonlinear spectralsingularities in TE modes of a homogeneous slab of active optical material thatis placed between two mirrors. We use the results together with two basicpostulates regarding the behavior of laser light emission to derive explicitexpressions for the laser threshold condition and output intensity for thesemodes of the slab and discuss their physical implications. In particular, wereveal the details of the dependence of the threshold gain and output intensityon the position and properties of the mirrors and on the real part of therefractive index of the gain material.

Spectral Singularities, Threshold Gain, and Output Intensity for a Slab Laser with Mirrors