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Related Experiment Videos

Phase-locked mutually coupled 1.3 microm quantum-dot lasers.

Stephen P Hegarty1, David Goulding, Bryan Kelleher

  • 1Tyndall National Institute, Lee Maltings, Cork, Ireland. stephen.hegarty@tyndall.ie

Optics Letters
|November 21, 2007
PubMed
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Mutually coupled Fabry-Perot InAs quantum-dot lasers achieve stable phase-locked output. This narrow linewidth is achieved with frequency detuning under 4 GHz, enabling photonics applications.

Area of Science:

  • Optics and Photonics
  • Semiconductor Lasers
  • Quantum Dot Technology

Background:

  • Fabry-Perot lasers are fundamental optical devices.
  • Quantum dot (InAs) lasers offer unique properties for light emission.
  • Mutual coupling is a technique to synchronize laser outputs.

Purpose of the Study:

  • To investigate the phase-locking behavior of mutually coupled InAs quantum-dot lasers.
  • To determine the conditions for achieving stable, narrow-linewidth laser output.
  • To explore the potential applications of this laser locking scheme.

Main Methods:

  • Growth of Indium Arsenide (InAs) quantum-dot lasers on Gallium Arsenide (GaAs) substrates.
  • Experimental setup for mutual coupling of two Fabry-Perot lasers with a nanosecond delay.

Related Experiment Videos

  • Characterization of laser output spectra to measure linewidth and assess phase-locking stability.

    • Main Results:

    • Stable phase-locked output was achieved between the coupled lasers.
    • Narrow linewidth operation was observed when the frequency detuning was less than 4 GHz.
    • The demonstrated locking scheme is robust and simple to implement.

    Conclusions:

    • Mutual coupling of InAs quantum-dot lasers provides a viable method for achieving stable, narrow-linewidth emission.
    • The demonstrated technique is effective for frequency detuning below 4 GHz.
    • This simple laser locking scheme holds promise for various photonics applications.