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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Excitable phase slips in an injection-locked single-mode quantum-dot laser.

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  • 1Tyndall National Institute, Lee Maltings, Cork, Ireland. bryan.kelleher@tyndall.ie

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Summary

This study reveals excitable pulses in optically injected quantum-dot lasers, demonstrating saddle-node bifurcations and 2pi phase slips. Interpulse timing follows a Kramers-like distribution, offering new insights into laser dynamics.

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Area of Science:

  • Quantum optics
  • Semiconductor physics
  • Nonlinear dynamics

Background:

  • Quantum-dot semiconductor lasers are crucial for optoelectronics.
  • Understanding their dynamics under optical injection is vital for device applications.
  • Previous studies have not fully explored the excitable dynamics near locking boundaries.

Purpose of the Study:

  • To experimentally investigate the dynamics of a single-mode quantum-dot semiconductor laser under optical injection.
  • To report the first observation of excitable pulses near locking boundaries for both positive and negative detuning.
  • To analyze the phase evolution and interpulse-time statistics of these pulses.

Main Methods:

  • Experimental setup for optical injection into a single-mode quantum-dot laser.
  • Measurement of slave electric-field phase evolution during pulsing.
  • Analysis of interpulse-time statistics.

Main Results:

  • First observation of excitable pulses near locking boundaries for both positive and negative detuning.
  • Confirmation of locking via saddle-node bifurcation for both detuning signs.
  • Measurement of 2pi phase slips as the cause of pulsing.
  • Obtained Kramers-like distribution for interpulse-time statistics.

Conclusions:

  • Optical injection induces excitable pulsing in quantum-dot lasers through saddle-node bifurcations.
  • The observed dynamics are characterized by 2pi phase slips and Kramers-like interpulse-time statistics.
  • This research provides fundamental insights into the nonlinear dynamics of quantum-dot lasers.