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Related Experiment Videos

Red-Emitting Semiconductor Quantum Dot Lasers

Fafard1, Hinzer, Raymond

  • 1Institute for Microstructural Sciences, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6.

Science (New York, N.Y.)
|November 22, 1996
PubMed
Summary

Semiconductor quantum dot (QD) lasers demonstrate stimulated emission using highly strained InAlAs. These high-quality QDs achieved efficient carrier injection and significant output power at low temperatures.

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Area of Science:

  • Semiconductor physics
  • Optoelectronics
  • Materials science

Background:

  • Semiconductor quantum dots (QDs) offer unique electronic and optical properties due to quantum confinement.
  • Developing efficient QD-based laser structures is crucial for advanced optoelectronic devices.
  • Previous research has explored various QD materials and growth techniques for laser applications.

Purpose of the Study:

  • To demonstrate visible-stimulated emission in a semiconductor laser structure utilizing self-assembled quantum dots.
  • To investigate the performance characteristics of InAlAs quantum dots for laser applications.
  • To assess the potential of these QD structures for efficient light emission.

Main Methods:

  • Growth of highly strained Indium Aluminum Arsenide (InAlAs) quantum dots via molecular beam epitaxy on a Gallium Arsenide (GaAs) substrate.

Related Experiment Videos

  • Fabrication of a broad area laser structure with a separate confinement heterostructure for electrical carrier injection.
  • Characterization of stimulated emission at cryogenic temperatures (77 Kelvin) and measurement of laser performance metrics.

    • Main Results:

    • Efficient carrier thermalization into zero-dimensional QD states was achieved.
    • Stimulated emission was observed at approximately 707 nanometers.
    • A threshold current of 175 milliamperes was measured for a 60 µm x 400 µm laser, with an external efficiency of ~8.5% and peak power >200 mW at 77 K.

    Conclusions:

    • Visible-stimulated emission is successfully demonstrated in a semiconductor quantum dot laser.
    • The highly strained InAlAs QDs exhibit excellent size distribution and high gain, suitable for laser applications.
    • These results highlight the potential of self-assembled QDs for efficient and high-performance optoelectronic devices.