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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 2 — Jan. 18, 2010
  • pp: 746–753

Activation energy study of electron transport in high performance short wavelengths quantum cascade lasers

Christian Pflügl, Laurent Diehl, Arkadiy Lyakh, Qi Jie Wang, Richard Maulini, Alexei Tsekoun, C. Kumar N. Patel, Xiaojun Wang, and Federico Capasso  »View Author Affiliations

Optics Express, Vol. 18, Issue 2, pp. 746-753 (2010)

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We present a method to study current paths through quantum cascade lasers (QCLs). The temperature dependence of the current is measured at a fixed voltage. At low temperatures we find activation energies that correspond to the energy difference between the injector ground state and the upper laser level. At higher temperatures additional paths with larger activation energies are found. Application of this method to high performance QCLs based on strained InGaAs/InAlAs quantum wells and barriers with different band-offsets allows us to identify individual parasitic current paths through the devices. The results give insight into the transport properties of quantum cascade lasers thus providing a useful tool for device optimization.

© 2010 OSA

OCIS Codes
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade
(250.5590) Optoelectronics : Quantum-well, -wire and -dot devices

ToC Category:
Lasers and Laser Optics

Original Manuscript: November 23, 2009
Revised Manuscript: December 21, 2009
Manuscript Accepted: December 21, 2009
Published: January 5, 2010

Christian Pflügl, Laurent Diehl, Arkadiy Lyakh, Qi Jie Wang, Richard Maulini, Alexei Tsekoun, C. Kumar N. Patel, Xiaojun Wang, and Federico Capasso, "Activation energy study of electron transport in high performance short wavelengths quantum cascade lasers," Opt. Express 18, 746-753 (2010)

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