The Planetary Systems Imager Adaptive Optics System: An Initial Optical Design and Performance Analysis Tools for the PSI-Red AO System

Jensen-Clem, Rebecca; Hinz, Philip M.; van Kooten, M. A. M.; Fitzgerald, Michael P.; Sallum, Steph; Mazin, Benjamin A.; Chun, Mark; Max, Claire; Millar-Blanchaer, Maxwell; Skemer, Andy; Wang, Ji; Stelter, R. Deno; Guyon, Olivier

doi:10.48550/arxiv.2109.03321

Cited by 1 publication

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“…The aperture used in this appendix is generated by the HCIPy toolkit, which provides AO system and coronagraph simulators (Por et al 2018) and refers to the description of Jensen-Clem et al (2021).…”

Section: Appendix A: Application To the Tmt Aperturementioning

confidence: 99%

Redundant apodization for direct imaging of exoplanets 2: Application to island effects

Leboulleux,

Carlotti,

N'Diaye

et al. 2022

Preprint

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Context. Telescope pupil fragmentation from spiders generates specific aberrations that have been observed at various telescopes and are expected on the 30+-meter class telescopes under construction. This so-called island effect induces differential pistons, tips and tilts on the pupil petals, deforming the instrumental point spread function (PSF), and is one of the main limitation to the direct detection of exoplanets with high-contrast imaging. These petal-level aberrations can have different origins such as the low-wind effect or petaling errors in the adaptive optics reconstruction. Aims. In this paper, we propose to alleviate the impact of the aberrations induced by island effects on high-contrast imaging by adapting the coronagraph design in order to increase its robustness to petal-level aberrations. Methods. Following a method first developed and applied on robustness to errors due to primary mirror segmentation (segment phasing errors, missing segments...), we develop and test Redundant Apodized Pupils (RAP), i.e. apodizers designed at the petalscale, then duplicated and rotated to mimic the pupil petal geometry. Results. We apply this concept to the ELT architecture, made of six identical petals, to yield a 10 −6 contrast in a dark region from 8 to 40λ/D. Both amplitude and phase apodizers proposed in this paper are robust to differential pistons between petals, with minimal degradation to their coronagraphic PSFs and contrast levels. In addition, they are also more robust to petal-level tip-tilt errors than classical apodizers designed for the whole pupil, with which the limit of contrast of 10 −6 in the coronagraph dark zone is achieved for constraints up to 2 rad RMS of these petal-level modes. Conclusions. In this paper, the RAP concept proves its robustness to island effects (low-wind effect and post-adaptive optics petaling), with an application to the ELT architecture. It can also be considered for other 8-to 30-meter class ground-based units such as VLT/SPHERE, Subaru/SCExAO, GMT/GMagAO-X, or TMT/PSI.

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Section: Appendix A: Application To the Tmt Aperturementioning

confidence: 99%