Development of quantum cascade lasers for high peak output power and low threshold current density

S. Slivken*, M. Razeghi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Design and material optimization are used to both decrease the threshold current density and increase the output power for quantum cascade lasers. Waveguides are designed to try and minimize free-carrier and surface-plasmon absorption. Excellent material characterization is also presented, showing excellent control over layer thickness, interface quality, and doping level. Experiments are done to both optimize the injector doping level and to maximize the output power from a single aperture. At 300 K, a threshold current density as low as 1.8 kA/cm2 is reported, along with peak powers of approximately 2.5 W. Strain-balanced lasers are also demonstrated at λ ∼ 5 μm, exhibiting threshold current densities < 300 A/cm2 at 80 K. These values represent the state-of-the-art for mid-infrared lasers with λ > 4μm.

Original languageEnglish (US)
Pages (from-to)1531-1534
Number of pages4
JournalSolid-State Electronics
Issue number10
StatePublished - Oct 2002


  • Quantum cascade laser
  • Strain-balancing
  • Uncooled mid-infrared laser

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering


Dive into the research topics of 'Development of quantum cascade lasers for high peak output power and low threshold current density'. Together they form a unique fingerprint.

Cite this