Measurement and modelling of the chromatic dependence of a reflected wavefront on the Euclid space telescope dichroic mirror

Baron, Maël; Sassolas, B.; Frugier, Pierre-Antoine; Venancio, L. M. Gaspar; Amiaux, J.; Castelnau, Matthieu; Keller, Fanny; Dovillaire, Guillaume; Treimany, Pauline; Juvénal, Rémy; Miller, L.; Pinard, L.; Ealet, A.

doi:10.1117/12.2630072

Cited by 4 publications

(5 citation statements)

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“…35. However, if this is not the case and another non-smooth chromatic variation is present, currently occurring in Euclid (Venancio et al, 2016;Baron et al, 2022), there is no straightforward way to adapt the λRCA model to account for it. • Wavefront approach: Soulez et al (2016) proposed to model the propagation of light through the mirrors of the optical system.…”

Section: Other Psf Modelsmentioning

confidence: 99%

Reviews in astronomy and space sciences

2024

Frontiers Research Topics

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Frontiers is more than just an open access publisher of scholarly articles: it is a pioneering approach to the world of academia, radically improving the way scholarly research is managed. The grand vision of Frontiers is a world where all people have an equal opportunity to seek, share and generate knowledge. Frontiers provides immediate and permanent online open access to all its publications, but this alone is not enough to realize our grand goals. Frontiers journal seriesThe Frontiers journal series is a multi-tier and interdisciplinary set of openaccess, online journals, promising a paradigm shift from the current review, selection and dissemination processes in academic publishing. All Frontiers journals are driven by researchers for researchers; therefore, they constitute a service to the scholarly community. At the same time, the Frontiers journal series operates on a revolutionary invention, the tiered publishing system, initially addressing specific communities of scholars, and gradually climbing up to broader public understanding, thus serving the interests of the lay society, too. Dedication to qualityEach Frontiers article is a landmark of the highest quality, thanks to genuinely collaborative interactions between authors and review editors, who include some of the world's best academicians. Research must be certified by peers before entering a stream of knowledge that may eventually reach the public -and shape society; therefore, Frontiers only applies the most rigorous and unbiased reviews. Frontiers revolutionizes research publishing by freely delivering the most outstanding research, evaluated with no bias from both the academic and social point of view. By applying the most advanced information technologies, Frontiers is catapulting scholarly publishing into a new generation. What are Frontiers Research Topics?Frontiers Research Topics are very popular trademarks of the Frontiers journals series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area.

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Section: Other Psf Modelsmentioning

confidence: 99%

Reviews in astronomy and space sciences

2024

Frontiers Research Topics

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“…We note that such wavelength dependence could be added to our model, for example, to model a telescope with a diffractive element in the optical system, e.g. the dichroic filter in Euclid [56].…”

Section: Physical Motivation and The Wavefront Errormentioning

confidence: 99%

Rethinking data-driven point spread function modeling with a differentiable optical model

Liaudat

Starck²,

Kilbinger³

et al. 2023

Inverse Problems

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In astronomy, upcoming space telescopes with wide-field optical instruments have a spatially varying point spread function (PSF). Specific scientific goals require a high-fidelity estimation of the PSF at target positions where no direct measurement of the PSF is provided. Even though observations of the PSF are available at some positions of the field of view (FOV), they are undersampled, noisy, and integrated into wavelength in the instrument’s passband. PSF modeling represents a challenging ill-posed problem, as it requires building a model from these observations that can infer a super-resolved PSF at any wavelength and position in the FOV. Current data-driven PSF models can tackle spatial variations and super-resolution. However, they are not capable of capturing PSF chromatic variations. Our model, coined WaveDiff, proposes a paradigm shift in the data-driven modeling of the point spread function field of telescopes. We change the data-driven modeling space from the pixels to the wavefront by adding a differentiable optical forward model into the modeling framework. This change allows the transfer of a great deal of complexity from the instrumental response into the forward model. The proposed model relies on efficient automatic differentiation technology and modern stochastic first-order optimization techniques recently developed by the thriving machine-learning community. Our framework paves the way to building powerful, physically motivated models that do not require special calibration data. This paper demonstrates the WaveDiff model in a simplified setting of a space telescope. The proposed framework represents a performance breakthrough with respect to the existing state-of-the-art data-driven approach. The pixel reconstruction errors decrease 6-fold at observation resolution and 44-fold for a 3x super-resolution. The ellipticity errors are reduced at least 20 times, and the size error is reduced more than 250 times. By only using noisy broad-band in-focus observations, we successfully capture the PSF chromatic variations due to diffraction.

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“…Optical systems with wide focal planes, generally associated with wide field-of-views (FOVs), present significant PSF spatial variations. • Spectral variations: Principally, due to the diffraction phenomena and its well-known wavelength dependence covered in Section 2, refractive 2 components of the optical system under study are also a source of spectral variations (Baron et al, 2022). Other sources of spectral variations are detector electronic components (Meyers and Burchat, 2015a) and atmospheric chromatic effects (Meyers and Burchat, 2015b).…”

Section: General Observational Modelmentioning

confidence: 99%

“…Even if these components have a high-quality manufacturing process, they can induce significant chromatic variations in reflection that affect the PSF morphology. Baron et al (2022) proposed a test bench to characterise Euclid's dichroic filter and a numerical model of its chromatic dependence. • Light polarisation: In Section 2, we studied the scalar diffraction theory, thus neglecting light polarisation.…”

Section: Optic-level Contributorsmentioning

confidence: 99%

Section: Other Psf Modelsmentioning

confidence: 99%

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Point spread function modelling for astronomical telescopes: a review focused on weak gravitational lensing studies

Liaudat,

Starck,

Kilbinger

2023

Front. Astron. Space Sci.

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The accurate modelling of the point spread function (PSF) is of paramount importance in astronomical observations, as it allows for the correction of distortions and blurring caused by the telescope and atmosphere. PSF modelling is crucial for accurately measuring celestial objects’ properties. The last decades have brought us a steady increase in the power and complexity of astronomical telescopes and instruments. Upcoming galaxy surveys like Euclid and Legacy Survey of Space and Time (LSST) will observe an unprecedented amount and quality of data. Modelling the PSF for these new facilities and surveys requires novel modelling techniques that can cope with the ever-tightening error requirements. The purpose of this review is threefold. Firstly, we introduce the optical background required for a more physically motivated PSF modelling and propose an observational model that can be reused for future developments. Secondly, we provide an overview of the different physical contributors of the PSF, which includes the optic- and detector-level contributors and atmosphere. We expect that the overview will help better understand the modelled effects. Thirdly, we discuss the different methods for PSF modelling from the parametric and non-parametric families for ground- and space-based telescopes, with their advantages and limitations. Validation methods for PSF models are then addressed, with several metrics related to weak-lensing studies discussed in detail. Finally, we explore current challenges and future directions in PSF modelling for astronomical telescopes.

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Measurement and modelling of the chromatic dependence of a reflected wavefront on the Euclid space telescope dichroic mirror

Cited by 4 publications

References 0 publications

Reviews in astronomy and space sciences

Reviews in astronomy and space sciences

Rethinking data-driven point spread function modeling with a differentiable optical model

Point spread function modelling for astronomical telescopes: a review focused on weak gravitational lensing studies

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