28 August 2014 Demonstration of vortex coronagraph concepts for on-axis telescopes on the Palomar Stellar Double Coronagraph
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Here we present preliminary results of the integration of two recently proposed vortex coronagraph (VC) concepts for on-axis telescopes on the Stellar Double Coronagraph (SDC) bench behind PALM-3000, the extreme adaptive optics system of the 200-inch Hale telescope of Palomar observatory. The multi-stage vortex coronagraph (MSVC) uses the ability of the vortex to move light in and out of apertures through multiple VC in series to restore the nominal attenuation capability of the charge 2 vortex regardless of the aperture obscurations. The ring-apodized vortex coronagraph (RAVC) is a one-stage apodizer exploiting the VC Lyot-plane amplitude distribution in order to perfectly null the diffraction from any central obscuration size, and for any vortex topological charge. The RAVC is thus a simple concept that makes the VC immune to diffraction effects of the secondary mirror. It combines a vortex phase mask in the image plane with a single pupil-based amplitude ring apodizer, tailor-made to exploit the unique convolution properties of the VC at the Lyot-stop plane. The prototype apodizer uses the same microdot technology that was used to manufacture the apodized pupil Lyot coronagraph (APLC) equipping SPHERE, GPI and P1640.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dimitri Mawet, Dimitri Mawet, Chris Shelton, Chris Shelton, James Wallace, James Wallace, Michael Bottom, Michael Bottom, Jonas Kuhn, Jonas Kuhn, Bertrand Mennesson, Bertrand Mennesson, Rick Burruss, Rick Burruss, Randy Bartos, Randy Bartos, Laurent Pueyo, Laurent Pueyo, Alexis Carlotti, Alexis Carlotti, Eugene Serabyn, Eugene Serabyn, } "Demonstration of vortex coronagraph concepts for on-axis telescopes on the Palomar Stellar Double Coronagraph", Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 91432T (28 August 2014); doi: 10.1117/12.2057274; https://doi.org/10.1117/12.2057274


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