Generation and stabilization of continuous wave THz emission from a bi-color VECSEL

Thibault A.G. Bondaz, Alexandre Laurain, Jerome V. Moloney, John G. McInerney

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


We present a laser system for the generation and stabilization of continuous wave emission at 1.9 THz. The system is based on difference frequency generation (DFG) from a bi-color vertical external cavity surface emitting laser (VECSEL). The intracavity DFG process enables THz generation with milliwatt power level at room temperature with a clear quadratic dependence on the intracavity power. The two colors are spectrally selected via an intracavity etalon while the laser cavity geometry is engineered to minimize mode competition between the two colors via spatial hole burning, improving the stability of the THz emission. The intensity noise of the THz output is further reduced by 16 dB/Hz with an active stabilization scheme. The origin of residual fluctuations is discussed and we found that the asymmetrical amplification of one color reduced the RIN even further, down to 21 dB/Hz, comparing to the free-running symmetrical lasing.

Original languageEnglish (US)
Title of host publicationVertical External Cavity Surface Emitting Lasers (VECSELs) X
EditorsJennifer E. Hastie
ISBN (Electronic)9781510632899
StatePublished - 2020
EventVertical External Cavity Surface Emitting Lasers (VECSELs) X 2020 - San Francisco, United States
Duration: Feb 4 2020Feb 5 2020

Publication series

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


ConferenceVertical External Cavity Surface Emitting Lasers (VECSELs) X 2020
Country/TerritoryUnited States
CitySan Francisco


  • Bi-color
  • DFG
  • Semiconductor lasers
  • Stabilization
  • THz source

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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