High power CW quantum cascade lasers: How short can we go?

Manijeh Razeghi*, Allan Evans, Steven Slivken, Jae Su Yu

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

15 Scopus citations


Limiting factors for short-wavelength CW QCL designs are discussed. A model is used to predict the short-wavelength cutoff for strain-balanced QCL structures. High performance is predicted at wavelengths as short as 3.0μm based on a conduction band offset of 0.9 eV in the GalnAs/AlInAs materials. Recent work is presented on the growth of strained materials using gas-source molecular beam epitaxy to investigate the model predictions. Advanced material characterization, including high-resolution x-ray diffraction, photoluminescence, atomic force microscopy, and wafer-scale uniformity and repeatability are demonstrated for highly-strained and strain-balanced QCL structures. Laser testing results are presented for QCLs operating near the short wavelength limit at 3.66μm. Lastly, predictions for further performance improvement at short wavelengths are discussed.

Original languageEnglish (US)
Article number01
Pages (from-to)1-12
Number of pages12
JournalProgress in Biomedical Optics and Imaging - Proceedings of SPIE
StatePublished - 2005
EventNovel In-Plane Semiconductor Lasers IV - San Jose, CA, United States
Duration: Jan 24 2005Jan 27 2005


  • Gas Source Molecular Beam Epitaxy
  • InP
  • Intersubband Transition
  • Mid-infrared
  • Quantum Cascade Laser
  • Strain-Balanced

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging


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