Recent development of high-power widely tunable THz quantum cascade laser sources based on difference-frequency generation

M. Razeghi, Q. Y. Lu, N. Bandyopadhyay, S. Slivken

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

5 Scopus citations


We present the recent development of high performance compact THz sources based on intracavity nonlinear frequency mixing in mid-infrared quantum cascade lasers. Significant performance improvements of our THz sources with respect to the continuous wave THz power output, monolithic THz tuning, and widely frequency are achieved by systematic optimization of the device's active region, waveguide design, and chip bonding strategy. Room temperature continuous wave THz power of more than 10 μW at 3.4 THz is demonstrated at room temperature. Monolithic THz tuning of a chip-based THz source from 2.6 to 4.2 THz with power up to 0.1 mW is achieved. Surface emission from the substrate via a diffraction grating with THz power up to 0.5 mW is also obtained. The developing characteristics show the potential for these THz sources as local oscillators for many astronomical and medical applications.

Original languageEnglish (US)
Title of host publicationTerahertz Emitters, Receivers, and Applications VI
EditorsAlexei N. Baranov, Manijeh Razeghi, Dimitris Pavlidis, John M. Zavada
ISBN (Electronic)9781628417517
StatePublished - 2015
EventTerahertz Emitters, Receivers, and Applications VI - San Diego, United States
Duration: Aug 9 2015Aug 10 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


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


  • Terahertz
  • difference frequency generation
  • distributed feedback
  • quantum cascade lasers

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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