Computation of the Fresnel diffraction of starshades based on a polygonal approximation

Simon Prunet; Claude Aime; André Ferrari; Céline Theys

doi:10.1117/12.3014300

23 August 2024 Computation of the Fresnel diffraction of starshades based on a polygonal approximation

Simon Prunet, Claude Aime, André Ferrari, Céline Theys

Proceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 130925C (2024) https://doi.org/10.1117/12.3014300
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The design of starshades, i.e. external occulters for stellar coronography, relies on the fast and precise computation of their associated diffraction patterns of incoming plane waves in the telescope aperture plane. We present here a method based on a polygonal approximation of the occulter’s shape, that allows fast computation of their diffraction patterns in the Fresnel approximation, without aliasing artefacts. It is competitive with respect to methods based on direct 2D Fourier transforms, or Boundary Diffraction Wave algorithms.

Citation Download Citation

Simon Prunet, Claude Aime, André Ferrari, and Céline Theys "Computation of the Fresnel diffraction of starshades based on a polygonal approximation", Proc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 130925C (23 August 2024); https://doi.org/10.1117/12.3014300

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