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Quantum cascade lasers designed toward shorter wavelengths.

Jilian Xu1, Lei Liu, Bing Hui Li

  • 1State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, No.3888 Dongnanhu Road, Changchun 130033, People's Republic of China. University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|January 22, 2016
PubMed
Summary
This summary is machine-generated.

This study explores extending quantum cascade lasers (QCLs) beyond mid-infrared frequencies. By introducing two-dimensional confinement, QCLs can achieve near-infrared and visible light emission, expanding their spectral range.

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Area of Science:

  • Semiconductor physics
  • Optoelectronics
  • Quantum optics

Background:

  • Quantum cascade lasers (QCLs) typically utilize one-dimensional quantum wells.
  • Current QCL designs face limitations in achieving lasing frequencies beyond the mid-infrared spectrum.

Purpose of the Study:

  • To investigate the theoretical possibility of extending QCL spectral range to higher frequencies.
  • To explore the impact of adding an extra dimension of confinement on QCL operation.

Main Methods:

  • Theoretical modeling of a two-dimensional confined quantum cascade laser.
  • Utilizing the ZnO/MgO material system as a specific example for simulation.

Main Results:

  • Demonstrated theoretical feasibility of two-dimensional confined QCLs.
  • Predicted operation across a wide spectral range, including near-infrared (e.g., 1.57 μm, 1.13 μm) and visible (734 nm) wavelengths.
  • Proposed a novel approach to overcome mid-infrared limitations in QCLs.

Conclusions:

  • Two-dimensional confinement offers a viable pathway to extend QCLs to higher frequency ranges.
  • The ZnO/MgO system shows promise for developing novel QCLs operating in the near-infrared and visible spectrum.
  • This research opens new avenues for QCL applications in higher frequency domains.