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• W3105616013 abstract "The Habitable Exoplanet Imaging Mission (HabEx) concept requires an optical coronagraph that provides deep starlight suppression over a broad spectral bandwidth, high throughput for point sources at small angular separation, and insensitivity to temporally-varying, low-order aberrations. Vortex coronagraphs are a promising solution that perform optimally on off-axis, monolithic telescopes and may also be designed for segmented telescopes with minor losses in performance. We describe the key advantages of vortex coronagraphs on off-axis telescopes: 1) Unwanted diffraction due to aberrations is passively rejected in several low-order Zernike modes relaxing the wavefront stability requirements for imaging Earth-like planets from <10 to >100 pm rms. 2) Stars with angular diameters >0.1 $lambda/D$ may be sufficiently suppressed. 3) The absolute planet throughput is >10%, even for unfavorable telescope architectures. 4) Broadband solutions ($Deltalambda/lambda>0.1$) are readily available for both monolithic and segmented apertures. The latter make use of grayscale apodizers in an upstream pupil plane to provide suppression of diffracted light from amplitude discontinuities in the telescope pupil without inducing additional stroke on the deformable mirrors. We set wavefront stability requirements on the telescope, based on a stellar irradiance threshold set at an angular separation of 3$pm$0.5 $lambda/D$ from the star, and discuss how some requirements may be relaxed by trading robustness to aberrations for planet throughput." @default.
• W3105616013 created "2020-11-23" @default.
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• W3105616013 date "2018-03-28" @default.
• W3105616013 modified "2023-10-13" @default.
• W3105616013 title "Vortex coronagraphs for the Habitable Exoplanet Imaging Mission concept: theoretical performance and telescope requirements" @default.
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• W3105616013 doi "https://doi.org/10.1117/1.jatis.4.1.015004" @default.
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