Quantum-cascade lasers without injector regions

A. Friedrich, M. C. Amann

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


We present the status of quantum-cascade lasers without injector regions, based on a four- and five-level staircase, respectively. First lasers were realized at a wavelength of ∼10 μm. By applying an optimized design, we achieved high performance injectorless quantum-cascade lasers emitting at ∼6.7 μm. On the basis of this design, we investigated the influence of doping density and the number of periods of active sections. A sample with a doping sheet density of 2.5×1010 cm-2 and 60 periods of active sections shows record low threshold current densities of 0.75 kA/cm2 at 300 K. Recently, we have further extended the wavelength range even down to ∼4.2 μm.

Original languageEnglish
Title of host publicationNovel In-Plane Semiconductor Lasers VI
StatePublished - 2007
EventNovel In-Plane Semiconductor Lasers VI - San Jose, CA, United States
Duration: 22 Jan 200725 Jan 2007

Publication series

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


ConferenceNovel In-Plane Semiconductor Lasers VI
Country/TerritoryUnited States
CitySan Jose, CA


  • Intersubband lasers
  • Mid-infrared lasers
  • Quantum-cascade lasers
  • Semiconductor lasers


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