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Pump-induced exceptional points in lasers.

M Liertzer1, Li Ge, A Cerjan

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

Physical Review Letters
|June 12, 2012
PubMed
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Nonuniform laser pumping can induce exceptional points, causing lasers to unexpectedly turn off. These singularities in non-Hermitian systems offer new ways to study laser dynamics.

Area of Science:

  • Physics
  • Quantum Optics
  • Non-Hermitian Systems

Background:

  • Lasers exhibit complex behavior above their threshold.
  • Non-Hermitian systems possess unique properties like exceptional points where eigenstates coalesce.
  • Understanding laser dynamics under non-uniform pumping is crucial for device optimization.

Purpose of the Study:

  • To investigate the impact of nonuniform pumping on laser above-threshold behavior.
  • To demonstrate the role of exceptional points in modifying laser output.
  • To propose experimental methods for observing these phenomena.

Main Methods:

  • Theoretical analysis of non-Hermitian operators describing lasing modes.
  • Modeling laser behavior near singularities (exceptional points).

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  • Identifying signatures of pump-induced exceptional points.

    • Main Results:

    • Nonuniform pumping can induce exceptional points in lasers.
    • Exceptional points lead to anomalous behavior, including laser shutdown with increased pump power.
    • These effects are observable in coupled ridge and microdisk laser systems.

    Conclusions:

    • Exceptional points significantly influence laser above-threshold dynamics.
    • Nonuniform pumping provides a mechanism to engineer and observe exceptional points in lasers.
    • Experimental verification using coupled micro-lasers is feasible.