High-power distributed-feedback quantum cascade lasers

W. W. Bewley*, I. Vurgaftman, C. S. Kim, J. R. Meyer, J. Nguyen, A. J. Evans, J. S. Yu, S. R. Darvish, S. Slivken

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Whereas high-power operation (> 1 W of cw output power at 200 K) has been demonstrated for quantum cascade lasers emitting at λ = 4.7-6.2 μm, those devices generally exhibited multiple longitudinal modes. Recently, a distributed-feedback quantum cascade laser operating in a single spectral mode at λ = 4.8 μm and at temperatures up to 333 K has been reported. In the present work, we provide detailed measurements and modeling of its performance characteristics. The sidemode suppression ratio exceeds 25 dB, and the emission remains robustly single-mode at all currents and temperatures tested. Cw output powers of 99 mW at 298 K and 357 mW at 200 K are obtained at currents well below the thermal rollover point. The slope efficiency and subthreshold amplified spontaneous emission spectra are shown to be consistent with a coupling coefficient of no more than κL ≈ 4-5, which is substantially lower than the estimate of 9 based on the nominal grating fabrication parameters.

Original languageEnglish (US)
Title of host publicationQuantum Sensing and Nanophotonic Devices III
StatePublished - 2006
EventQuantum Sensing and Nanophotonic Devices III - San Jose, CA, United States
Duration: Jan 23 2006Jan 26 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherQuantum Sensing and Nanophotonic Devices III
Country/TerritoryUnited States
CitySan Jose, CA


  • Diode laser
  • Mid-infrared
  • Quantum cascade laser
  • Quantum well

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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