Complex-coupled quantum cascade distributed-feedback laser

Claire Gmachl, Jérôme Faist, James N. Baillargeon, Federico Capasso, Carlo Sirtori, Deborah L. Sivco, S. N.George Chu, Alfred Y. Cho

Research output: Contribution to journalArticlepeer-review

86 Scopus citations


Quantum-cascade distributed-feedback lasers (QC-DFB) with a grating close to the active region are reported. Feedback is provided by the grating in a refractive index-dominated coupling scheme. Reliable single-mode emission at λ cm ≈ 5.4 μm with a side-mode suppression ratio (SMSR) ≈30 dB is observed. The laser is continuously tunable over 40 nm with a coefficient of Δλ/ΔT ≈ 0.37 nm/K in the temperature range from 200 K to 300 K. Comparison with Fabry-Perot QC lasers shows an overall improved performance of QC-DFB lasers.

Original languageEnglish (US)
Pages (from-to)1090-1092
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number8
StatePublished - Aug 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


  • Distributed-feedback laser
  • Mid-infrared
  • Unipolar semiconductor laser


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