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Related Experiment Videos

High-Power Infrared (8-Micrometer Wavelength) Superlattice Lasers

Scamarcio1, Capasso, Sirtori

  • 1Bell Laboratories, Lucent Technologies, 700 Mountain Avenue, Murray Hill, NJ 07974, USA.

Science (New York, N.Y.)
|May 2, 1997
PubMed
Summary
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A novel superlattice quantum-cascade laser emits infrared light via electron tunneling. This design achieves high power and tunable wavelengths, showing potential for advanced infrared sources.

Area of Science:

  • Quantum electronics
  • Optoelectronics
  • Solid-state physics

Background:

  • Quantum cascade lasers (QCLs) are semiconductor devices emitting light via electron transitions between quantized states.
  • Superlattices offer unique electronic band structures (minibands) and energy gaps (minigaps) that can be engineered for specific optical properties.

Purpose of the Study:

  • To demonstrate a quantum-cascade laser utilizing superlattice active regions for infrared emission.
  • To investigate the performance and potential of this superlattice-based design for high-power infrared sources.

Main Methods:

  • Fabrication of a superlattice structure using molecular beam epitaxy with alternating AlInAs barriers and GaInAs quantum wells.
  • Characterization of pulsed laser operation, measuring output power and wavelength at cryogenic temperatures.

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Main Results:

  • Successful demonstration of a quantum-cascade laser operating at approximately 8 micrometers.
  • Achieved peak powers from 0.80 W at 80 K to 0.2 W at 200 K.
  • Highlighted high oscillator strength of the optical transition within the superlattice.

Conclusions:

  • Strongly coupled superlattices are viable materials for infrared laser development.
  • The demonstrated design shows promise for tunable, high-power infrared laser sources.
  • Tailoring superlattice parameters allows for precise control over emission wavelength.