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Revealing the secrets of optical surfaces

profilePhoto   Gisela Schach
Linksium Contact Gisela Schach +33 (0)6 33 63 44 99
GTF 1 ASONG image


  • High resolution
  • Flexibility
  • Contained cost

Key words

  • Wavefront sensing
  • Optical surface characterisation

Intellectual Property

  • 1 patent


  • IPAG


  • CNRS
  • UGA

Linksium Continuum

  • Maturation


A wavefront sensor (WFS) is a device for measuring the aberrations of the optical wavefront. WFS devices are used to measure and characterise optical systems and their shape errors. This technology has become a key element in biomedical applications, metrology of optical components or characterization of laser beams.


ASONG WFS belongs to that class of WFS where an image of the pupil of the tested optical system is formed on a detector array, thus enabling high spatial resolution of the measured wave front error (WFE). It essentially consists of two elements: a measurement head and a calculation unit. The measurement head key element is a filter characterized by a variable transmission.


The ASONG WFS combines the best characteristics of its predecessors and competitors, like the Shack–Hartmann WFS and the Pyramid WFS, in a smart solution: high resolution, accuracy and dynamic range, with a compact and static opto-mechanical design.

State of progress

The concept has been already tested through simulations and preliminary laboratory prototype. The final prototype design study is in progress. Most of the components have been already procured and characterised. @TRL3 straightforward on the way for TRL4.


The WFS technology is used to measure optical aberrations and to characterize optical surfaces. The WFSs are largely used in optical metrology, medical imaging and ophthalmology. This kind of systems are used for astronomical applications to measure and correct the effect of the atmospheric turbulence on the signal. This technology is also used in defence fields and for the observation of space debris.

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