Un coronographe interf\'erentiel achromatique coaxial

TL;DR

The paper introduces the CIAXE, a new on-axis achromatic interfero-coronagraph with a simple, compact, and coaxial design, potentially improving exoplanet imaging instrumentation.

Contribution

It presents the design and advantages of the CIAXE, a novel variant of the AIC that is fully coaxial and easier to integrate into telescopic instruments.

Findings

Simplified, compact, and coaxial optical design.

Facilitates integration into existing telescope instrumentation.

Potential to advance exoplanet detection capabilities.

Abstract

On-axis achromatic interfero-coronagraph. We present a new type of stellar interfero-coronagraph, the "CIAXE", which is a variant of the "AIC", the Achromatic Interfero-Coronagraph [3,4]. The CIAXE is characterized by a very simple, compact and fully coaxial optical combination. Indeed, contrarily to the classical AIC which has a Michelson interferometer structure, the CIAXE delivers its output beam on the same axis as the input beam. This will ease its insertion in the focal instrumentation of existing telescopes or next generation ones. Such a device could be a step forward in the field of instrumental search for exoplanets. ----- Dans le but deparvenir \`a l'imagerie \`a haute dynamique d'objets comme les exoplan\`etes, nous pr\'esentons ici un nouveau concept de coronographe stellaire interf\'erentiel, le "CIAXE". Il est d\'eriv\'e du "CIA", le Coronographe Interf\'erentiel Achromatique. Le CIAXE se distingue de son pr\'ed\'ecesseur par une combinaison optique originale, simplifi\'ee, tr\`es compacte et totalement coaxiale. En effet, \`a la diff\'erence du CIA classique qui est d\'eriv\'e de l'interf\'erom\`etre de Michelson, le CIAXE d\'elivre son faisceau de sortie sur le m\^eme axe que le faisceau d'entr\'ee, ce qui facilitera grandement son insertion au sein de l'instrumentation focale d'un t\'elescope. Un tel dispositif pourrait constituer une avanc\'ee en mati\`ere d'instrumentation focale pour la recherche d'exoplan\`etes.