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Symmetric nulling coronagraph based on a rotational shearing interferometer.

Deqing Ren1, Eugene Serabyn

  • 1Department of Physics, New Jersey Institute of Technology, Newark, New Jersey 07102-1982, USA. deqing.ren@njit.edu

Applied Optics
|December 2, 2005
PubMed
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A new fully symmetric nulling coronagraph using a rotational shearing interferometer (RSI) enables deep, broadband starlight rejection for imaging faint exoplanets. This design eliminates asymmetries for improved performance in single-aperture telescopes.

Area of Science:

  • Astronomy and Astrophysics
  • Optical Instrumentation

Background:

  • Imaging faint celestial objects near bright stars is challenging due to starlight.
  • Previous nulling coronagraphs for single-aperture telescopes had inherent asymmetries.
  • Rotational shearing interferometers (RSI) offer potential for starlight suppression.

Purpose of the Study:

  • To describe a novel, fully symmetric nulling coronagraph for single-aperture telescopes.
  • To enable the imaging of faint companions to nearby bright stars.
  • To eliminate asymmetries found in prior RSI-based designs.

Main Methods:

  • The coronagraph is based on a rotational shearing interferometer (RSI).
  • A fully symmetric optical layout is proposed.
  • The design ensures both bright and dark outputs are accessible.

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Main Results:

  • The proposed layout eliminates all inherent asymmetries of previous single-aperture RSI coronagraphs.
  • Deep, broadband, dual-polarization rejection of on-axis starlight is achievable.
  • The system is suitable for imaging faint companions.

Conclusions:

  • A fully symmetric nulling coronagraph based on RSI is presented.
  • This design overcomes limitations of previous systems.
  • It facilitates advanced exoplanet imaging with single-aperture telescopes.