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Uniform spike trains in optically injected quantum cascade oscillators.

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Quantum cascade lasers produce highly uniform spike trains due to their ultrashort carrier lifetime. This contrasts with other semiconductor lasers, offering new insights into noise-induced excitability.

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Area of Science:

  • Optics and Photonics
  • Semiconductor Physics
  • Quantum Electronics

Background:

  • Noise-induced excitability in semiconductor lasers typically yields non-uniform spike patterns.
  • Understanding laser dynamics near bifurcations is crucial for device applications.

Purpose of the Study:

  • To investigate the generation of uniform spike trains in quantum cascade lasers.
  • To identify the underlying physical mechanisms responsible for this phenomenon.

Main Methods:

  • Experimental recording of spike trains from a monochromatic laser-injected quantum cascade oscillator.
  • Theoretical analysis using a single-mode rate equation model incorporating quantum noise.

Main Results:

  • Observed highly uniform spike trains in quantum cascade oscillators near saddle-node bifurcation.
  • Identified ultrashort carrier lifetime (approx. 1 ps) as the primary cause of spike train uniformity.

Conclusions:

  • Quantum cascade lasers exhibit unique noise-induced excitability leading to uniform spike trains.
  • The ultrashort carrier lifetime is key to achieving this high uniformity, differentiating them from other laser types.