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A PT-symmetric optically active medium that lases at the threshold gain alsoacts as a complete perfect absorber at the laser wavelength. This is becausespectral singularities of PT-symmetric complex potentials are alwaysaccompanied by their time-reversal dual. We investigate the significance ofPT-symmetry for the appearance of these self-dual spectral singularities. Inparticular, using a realistic optical system we show that self-dual spectralsingularities can emerge also for non-PT-symmetric configurations. Thissignifies the existence of non-PT-symmetric CPA-lasers.

Self-dual Spectral Singularities and Coherent Perfect Absorbing Lasers without PT-symmetry