DFB quantum cascade laser arrays

Benjamin G. Lee, Mikhail A. Belkin, Christian Pflügl, Laurent Diehl, Haifei A. Zhang, Ross M. Audet, Jim MacArthur, David P. Bour, Scott W. Corzine, Gloria E. Höfler, Federico Capasso

Research output: Contribution to journalArticlepeer-review

111 Scopus citations


DFB quantum cascade laser (DFB-QCL) arrays op-erating between 8.7 and 9.4 μm are investigated for their perfor-mance characteristics-single-mode selection of the DFB grating, and variability in threshold, slope efficiency, and output power of different lasers in the array. Single-mode selection refers to the ability to choose a desired mode/frequency of laser emission with a DFB grating. We apply a theoretical framework developed for general DFB gratings to analyze DFB-QCL arrays. We calculate how the performance characteristics of DFB-QCLs are affected by the coupling strength kL of the grating, and the relative position of the mirror facets at the ends of the laser cavity with respect to the grating. We discuss how single-mode selection can be improved by design. Several DFB-QCL arrays are fabricated and their perfor-mance examined. We achieve desired improvements in single-mode selection, and we observe the predicted variability in the threshold, slope efficiency, and output power of the DFB-QCLs. As a demon-stration of potential applications, the DFB-QCL arrays are used to perform infrared absorption spectroscopy with fluids.

Original languageEnglish
Pages (from-to)554-565
Number of pages12
JournalIEEE Journal of Quantum Electronics
Issue number5
StatePublished - 2009
Externally publishedYes


  • DFB lasers
  • Infrared spectroscopy
  • Mid-infrared
  • Quantum cascade lasers (QCLs)
  • Semiconductor lasers


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