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Conference Papers Year : 2014

High contrast imaging on the THD bench: progress and upgrades


Direct imaging of exoplanets is very attractive but challenging and specific instruments like Sphere (VLT) or GPI (Gemini) are required to provide contrasts up to 16-17 magnitudes at a fraction of arcsec. To reach higher contrasts and detect fainter exoplanets, more-achromatic coronagraphs and a more-accurate wavefront control are needed. We already demontrated contrasts of ∼ 10 −8 at ∼ 4 λ/D at 635nm using a four quadrant phase mask and a self-coherent camera on our THD bench in laboratory. In this paper, we list the different techniques that were tested on the THD bench in monochromatic and polychromatic lights. Then, we present the upgraded version of the THD bench that includes several deformable mirrors for correcting phase and amplitude simultaneously and obtain a field-of-view covering the complete 360 degrees arouns the star with contrasts down to ∼ 10 −8 − 10 −9 .
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hal-03804597 , version 1 (13-03-2023)



Raphaël Galicher, Pierre Baudoz, Jacques Robert Delorme, J. Mazoyer, Gérard Rousset, et al.. High contrast imaging on the THD bench: progress and upgrades. Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, Jun 2014, Montréal, Quebec, Canada. pp.91435A 1-11, ⟨10.1117/12.2055902⟩. ⟨hal-03804597⟩
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