Room temperature continuous wave THz frequency comb based on quantum cascade lasers

M. Razeghi, Q. Y. Lu, F. H. Wang, D. H. Wu, S. Slivken

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


Frequency combs, spectra of phase-coherent equidistant lines, have revolutionized time and frequency metrology. The recently developed quantum cascade laser (QCL) comb has exhibits great potential with high power and broadband spectrum. However, in the terahertz (THz) range, cryogenic cooling has to be applied for THz QCL combs. We report a room temperature THz frequency comb at 3.0 THz based on difference-frequency generation from a mid-IR QCL comb. A largely detuned distributed-feedback grating is integrated into the QCL cavity to provide the single mode operation as well as enhanced spatial hole-burning effect for multimode comb operation. Multiheterodyne spectroscopy with multiple equally spaced lines by beating it with a reference Fabry-Pérot comb confirms the THz comb operation. This type of THz comb provides a new solution to chip-based high-speed high-resolution THz spectroscopy with compact size at room temperature.

Original languageEnglish (US)
Title of host publicationTerahertz Emitters, Receivers, and Applications X
EditorsManijeh Razeghi, Alexei N. Baranov, Miriam S. Vitiello
ISBN (Electronic)9781510629417
StatePublished - 2019
EventTerahertz Emitters, Receivers, and Applications X 2019 - San Diego, United States
Duration: Aug 11 2019Aug 13 2019

Publication series

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


ConferenceTerahertz Emitters, Receivers, and Applications X 2019
CountryUnited States
CitySan Diego


  • Four-wave mixing
  • Frequency comb
  • Group velocity dispersion
  • 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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