Recent advances of terahertz quantum cascade lasers

Manijeh Razeghi*

*Corresponding author for this work

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


In the past decade, tremendous development has been made in GaAs/AlGaAs based THz quantum cascade laser (QCLs), however, the maximum operating temperature is still limited below 200 K (without magnetic field). THz QCL based on difference frequency generation (DFG) represents a viable technology for room temperature operation. Recently, we have demonstrated room temperature THz emission (∼ 4 THz) up to 8.5 μW with a power conversion efficiency of 10 μW/W2. A dual-period distributed feedback grating is used to filter the mid-infrared spectra in favor of an extremely narrow THz linewidth of 6.6 GHz.

Original languageEnglish (US)
Title of host publicationTerahertz Emitters, Receivers, and Applications II
StatePublished - Oct 11 2011
EventTerahertz Emitters, Receivers, and Applications II - San Diego, CA, United States
Duration: Aug 21 2011Aug 21 2011


OtherTerahertz Emitters, Receivers, and Applications II
Country/TerritoryUnited States
CitySan Diego, CA


  • Difference frequency generation
  • III-nitride
  • Quantum cascade lasers
  • Terahertz

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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