Reference : PSF sharpening & post focal sensing for the VORTEX coronagraph
Scientific congresses and symposiums : Poster
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/213809
PSF sharpening & post focal sensing for the VORTEX coronagraph
English
Orban De Xivry, Gilles mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Jolivet, Aïssa mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Huby, Elsa mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Absil, Olivier mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Oct-2016
No
No
International
Wavefront sensing in the VLT/ELT era
3/11/2016 - 5/11/2016
Marseille
France
[en] wavefront sensing ; coronagraphy
[en] Small angle coronagaphy, such as the vortex phase mask, is a key scientific driver
for the coming generation of VLT-like instrument and for the future ELTs. It is
appealing for the full scientific exploitation of ground-based telescopes for the
detection and characterization of exoplanets and circumstellar discs. One key
element to small angle coronagraphy is a precise low-order wavefront control to
avoid any leak decreasing the contrast level and even possibly mimicking off-axis
signal. In this contribution, we present our early on-going effort in using post-
coronagraphic focal images to perform wavefront control with a vortex coron-
agraph. First, I will present an empirical approach similar to PSF sharpening
techniques, sometimes used in classical imaging to reduce NCPA aberrations,
to post-coronagraphic images. Then, I will discuss an alternative based on the
general weak-phase solution to retrieve the complex Efield in the Lyot plane
using three images, and how we can use this to control the phase in the pupil
plane. Finally, after presenting those two approaches and first simulations, I
will discuss the possible implementation of such techniques on our bench, the
vortex optical demonstrator for coronagraphic applications (VODCA).
Researchers
http://hdl.handle.net/2268/213809
FP7 ; 337569 - VORTEX - Taking extrasolar planet imaging to a new level with vector vortex coronagraphy

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