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Self-dual spectral singularities and coherent perfect absorbing lasers without PT-symmetry

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A PT-symmetric optically active medium that lases at the threshold gain also acts as a complete perfect absorber at the laser wavelength. This is because spectral singularities of PT-symmetric complex potentials are always accompanied by their time-reversal dual. We investigate the significance of PT-symmetry for the appearance of these self-dual spectral singularities. In particular, using a realistic optical system we show that self-dual spectral singularities can emerge also for non-PT-symmetric configurations. This signifies the existence of non-PT-symmetric coherent perfect absorbing lasers.

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Institute of Physics (IOP) Publishing

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Multidisciplinary physics, Mathematical physics

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Journal of Physics A

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10.1088/1751-8113/45/44/444024

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