Quantum cascade laser progress and outlook

M. Razeghi*, J. S. Yu, A. Evans, S. Slivken, S. R. Darvish, J. David, J. Nguyen, B. Gokden, S. Khosravani

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

7 Scopus citations


Recent progress and outlook in quantum cascade lasers (QCLs) in the mid- to far-infrared wavelength range (3.6-16 μm) are reviewed. Our recent work has focused on the development of high-power continuous-wave (CW) QCLs emitting in wavelengths of 4.3-6.3 μm at room temperature and above. For λ̃6 μm, advanced heterostructure geometries, including the use of a thick electroplated gold, epilayer-side heat sink lead to the first remarkable high-power CW QCL performance above room temperature, and a buried-ridge heterostructure are demonstrated to improve significantly laser performance (i.e., 579 mW at 298 K and operation up to 343 K) when combined with narrow laser ridges. Through re-engineering the optimized strain-balanced design, a similar excellent operation is achieved at 4.3-6.3 μm. The pulse operations of the shorter wavelength (3.6-4 μm) and the long wavelength (8-16 μm) QCLs at room temperature are also demonstrated. Lastly, these results are put in the perspective of other reported results and possible future directions are discussed.

Original languageEnglish (US)
Article number37
Pages (from-to)221-232
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2004
EventOptically Based Biological and Chemical Sensing for Defence - London, United Kingdom
Duration: Oct 25 2004Oct 28 2004


  • Continuous-wave
  • High-power semiconductor laser
  • Intersubband transition
  • Mid-infrared
  • Quantum cascade laser

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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