KAPAH | Linksium
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Generation of ultra-stable Terahertz waves by photo-mixing

profilePhoto   Gisela Schach
Linksium Contact Gisela Schach +33 (0)6 33 63 44 99 gisela.schach@linksium.fr
KAPAH Didier Pagnoux, CEO +33 (0)6 61 40 60 83 didier.pagnoux@kapah.com
Visuel kapah FEDER


  • Exceptional spectral purity
  • Long-term stability
  • Multi-THz tunability
  • Simplicity

Key words

  • Terahertz
  • 6G
  • Medical imaging
  • Defense

Intellectual Property

  • 1 patent

Partnerships & Rewards

  • Fonds FEDER Région Auvergne Rhône Alpes
  • 2023 French Deeptech Innovation Competition Winner
  • 2023 French Deeptech PhD Competition Winner




  • CNRS
  • UGA

Linksium Continuum

  • Maturation
  • Incubation


  • Incorporated startups


From medical to telecommunications, terahertz (THz) waves are already making a revolution despite the existence of a tunable, pure, and modular source. KAPAH offers a simple technology that meets all these points and generates THz waves of exceptional quality from 0,1 to 2 THz.


The laser’s spectral refinement by optical feedback is a technology developed at LIPhy for almost 20 years. It allows, by photo-mixing of two low phase noise lasers to generate very pure THz waves.


  • Industrial and commercial advantage: largely fiber-based system.
  • Business advantage: extremely tunable and spectrally fine instrument.
  • Ecological advantage: electricity consumption significantly lower than the competition.

State of progress

Given that the laboratory system is robust and agile, that its physics is well understood and that the results meet expectations, it is necessary to move to a phase of miniaturization and optimization which will guarantee the rapid diffusion of the technology in different fields.


THz waves can be used in several applications, in particular for:

  • Defense for detecting hidden non-metallic objects and for monitoring radar systems
  • Telecommunications to achieve the performance levels required for 6G and beyond
  • Medical imaging, THz allows medical imaging applications that are as precise and less harmful than X-rays or UV.

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