Advances in Solid State Physics pp 351-368

Part of the Advances in Solid State Physics book series (ASSP, volume 43)

Quantum Cascade Lasers for the Mid-infrared Spectral Range: Devices and Applications

  • Ch. Mann
  • Q. K. Yang
  • F. Fuchs
  • W. Bronner
  • R. Kiefer
  • K. Köhler
  • H. Schneider
  • R. Kormann
  • H. Fischer
  • T. Gensty
  • W. Elsäßer
Chapter

Abstract

Quantum cascade lasers emitting at λ∼5 µm based on different active region designs are investigated. Using lattice-matched GaInAs/AlInAs on InP substrates the maximum peak optical power as well as the maximum pulsed-mode operating temperature is enhanced by incorporating AlAs blocking barriers together with strain-compensating InAs layers into the active regions. Further improvement is achieved by employing strain-compensated GaInAs/AlInAs quantum wells for which maximum pulsed-mode operating temperatures in excess of 350 K are observed. High-reflectivity coated devices mounted substrate-side down show a maximum continuous-wave operating temperature of 194 K. Also the normalized relative intensity noise is investigated. Finally, a comparison trace-gas sensing experiment employing one of the present quantum cascade lasers and a lead-chalcogenide laser is presented. Detecting the P(25) absorption line of CO, higher stability is obtained using a quantum cascade laser.

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Authors and Affiliations

  • Ch. Mann
    • 1
  • Q. K. Yang
    • 1
  • F. Fuchs
    • 1
  • W. Bronner
    • 1
  • R. Kiefer
    • 1
  • K. Köhler
    • 1
  • H. Schneider
    • 1
  • R. Kormann
    • 2
  • H. Fischer
    • 2
  • T. Gensty
    • 3
  • W. Elsäßer
    • 3
  1. 1.Fraunhofer-Institute for Applied Solid State Physics (IAF)FreiburgGermany
  2. 2.Max-Planck-Institute for ChemistryMainzGermany
  3. 3.Institute of Applied PhysicsDarmstadt University of TechnologyDarmstadtGermany

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