Pump-induced exceptional points in lasers.

@article{Liertzer2012PumpinducedEP,
  title={Pump-induced exceptional points in lasers.},
  author={Matthias Liertzer and Li Ge and Alexander Cerjan and A. Douglas Stone and Hakan E. T{\"u}reci and Stefan Rotter},
  journal={Physical review letters},
  year={2012},
  volume={108 17},
  pages={173901}
}
We demonstrate that the above-threshold behavior of a laser can be strongly affected by exceptional points which are induced by pumping the laser nonuniformly. At these singularities, the eigenstates of the non-Hermitian operator which describes the lasing modes coalesce. In their vicinity, the laser may turn off even when the overall pump power deposited in the system is increased. Such signatures of a pump-induced exceptional point can be experimentally probed with coupled ridge or microdisk… CONTINUE READING
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