Prefer a chat interface with context about you and your work?
Self-dual spectral singularities and coherent perfect absorbing lasers without $\mathcal {P}\mathcal {T}$-symmetry
A -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 -symmetric complex potentials are always accompanied by their time-reversal dual. We investigate the significance of -symmetry for the appearance of these self-dual …