24 July 2014 Cheapest nuller in the world: crossed beamsplitter cubes
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In this communication is described a new type of Achromatic phase shifter (APS) suitable for both nulling interferometry and coronagraphy, based on a couple of crossed beamsplitter cubes, well-suited for equipping future spaceborne instruments searching for extra-solar planets located in a habitable zone. We present the general principle of this APS and discuss possible implementations into a nulling coronagraph telescope or into a sparse-aperture interferometer, either of the Fizeau or Michelson type. Expected performance in terms of transmission maps and a preliminary tolerance analysis are also provided. It turns out that the device is cheap, compact, and presents reasonable manufacturing tolerances and costs.
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François Hénault, François Hénault, Alain Spang, Alain Spang, } "Cheapest nuller in the world: crossed beamsplitter cubes", Proc. SPIE 9146, Optical and Infrared Interferometry IV, 914604 (24 July 2014); doi: 10.1117/12.2055091; https://doi.org/10.1117/12.2055091

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