Cheapest nuller in the world: Crossed beamsplitter cubes
F. Henault, A. Spang
TL;DR
This paper introduces a cost-effective, compact achromatic phase shifter using crossed beamsplitter cubes, designed for nulling interferometry and coronagraphy in space telescopes searching for exoplanets.
Contribution
It presents a novel, inexpensive APS based on crossed beamsplitter cubes, suitable for future spaceborne exoplanet search instruments, with analysis of performance and manufacturing tolerances.
Findings
Device is cheap and compact
Provides reasonable manufacturing tolerances
Suitable for nulling interferometry and coronagraphy
Abstract
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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