Low voltage-defect quantum cascade laser with heterogeneous injector regions

Anthony J. Hoffman, Stephan Schartner, Scott S. Howard, Kale J. Franz, Fred Towner, Claire F. Gmachl

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We demonstrate an In0.635Al0.356As/In 0.678Ga0.322As strain compensated quantum cascade laser that employs heterogeneous injector regions for low voltage defect operation. The active core consists of interdigitated undoped and doped injectors followed by nominally identical wavelength optical transitions. The undoped injector regions are designed with reduced voltage defect while the doped injectors are of a more conventional design. The measured average voltage defect is less than 79 meV. At 80 K, a 2.3 mm long, back facet high reflectance coated laser has an emission wavelength of 4.7 urn and outputs 2.3 W pulsed power with a peak wall-plug efficiency of 19%.

Original languageEnglish (US)
Pages (from-to)15818-15823
Number of pages6
JournalOptics Express
Issue number24
StatePublished - Nov 26 2007

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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