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Phys Rev Lett. 2012 Apr 27;108(17):173901. Epub 2012 Apr 24.

Pump-induced exceptional points in lasers.

Author information

  • 1Institute for Theoretical Physics, Vienna University of Technology, A-1040 Vienna, Austria, EU. matthias.liertzer@tuwien.ac.at

Abstract

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 lasers.

PMID:
22680867
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