Exoplanets and disks

We use our infrared vortex coronagraphs on 10-m class telescopes to study the architecture of extrasolar planetary systems, including the formation, composition and dynamics of giant planets, the morphology of transition disks, and the properties of dust grains in debris disks. Read more >>


Image processing

We develop and test new algorithms to process the images obtained with our vortex coronagraphs and other high-contrast imaging instruments. An image-processing pipeline based on Principal Component Analysis is under development (beta-testers welcome). Read more >>


Coronagraphic instruments

We collaborate with instrument teams and observatories in the design and realization of high contrast imager featuring vortex coronagraphs. We work together to optimize the on-sky performance of our vortex phase masks. Read more >>


Phase mask design

We use Rigorous Coupled Wave Analysis and Finite Difference Time Domain techniques to optimize the design of our vortex phase masks and reach the highest possible star light rejection over large wave bands. Advanced designs beyond the simple AGPM are being considered. Read more >>



We use Reactive Ion Etching to manufacture vortex phase masks on diamond substrates, using successive etching steps in various materials. We are currently optimizing all stages in the process, and developing new ways to correct for possible imperfections in the grating parameters. Read more >>


Optical testing

Most of our optical tests have been done at Paris Observatory so far. We are now developing an infrared coronagraphic testbench at the Université de Liège, which will cover the 1-5 µm wavelength range. Read more >>


Wave front sensing

We are developing and testing (in lab and on sky) new wave front sensing adapted to coronagraphs. These techniques aim to mitigate the influence of non-common path aberrations between the adaptive optics wave front sensor and the coronagraph. Read more >>


Advanced coronagraphs

We seek to combine phase mask coronagraphy and apodization in an optimal way to enhance star light rejection and sensitivity to faint planets. We also seek to use the optical angular momentum induced by vortex phase masks on stellar photons to improve star light rejection. Read more >>