Two-wavelength quantum cascade lasers with heterogeneous cascades

Axel Straub, Claire Gmachl, Trinesha S. Mosely, Raffaele Colombelli, Mariano Troccoli, Deborah L. Sivco, A. Michael Sergent, Federico Capasso, Alfred Y. Cho

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

3 Scopus citations


Quantum cascade (QC) lasers with a dual-wavelength interdigitated cascade are presented. Their active core consists of a stack of active regions and injectors emitting at 8.0 μm interleaved with a second stack emitting at 9, 5 μm. Laser action at two substantially different wavelengths is observed, demonstrating the viability of the "interdigitated cascade" approach for multi-wavelengti laser emission in the mid-infrared. This laser was also used to investigate the influence of the injector-doping on the device perfomance. Two QC lasers with different injector-doping levels were measured, in particular one only doped in the injectors bridging the 8.0 μm active region to the 9.5 μm active region and the remaining injectors undoped. A substantial reduction in threshold was observed for the laser wavelength with the undoped injector, confirming the significance of impurity scattering for the laser threshold in QC-lasers. Dual single-mode and tunable emission at two substantially different wavelength could be demonstrated with a QC laser emitting at 5.0 μm and 7.5 μm simultaneously. These lasers may be of interest for trace gas sensing, as the second wavelength could be used as in-built reference channel.

Original languageEnglish (US)
Title of host publication2002 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2002 - Proceedings
EditorsMichael Gal
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)0780375718
StatePublished - 2002
Externally publishedYes
EventConference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2002 - Sydney, Australia
Duration: Dec 11 2002Dec 13 2002

Publication series

NameConference on Optoelectronic and Microelectronic Materials and Devices, Proceedings, COMMAD


OtherConference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2002

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials


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