Explanipedia

Optical gains measurement with a gain scheduling camera: On-sky demonstration with PAPYRUS and perspectives Open

Arnaud Striffling, Cedric-Taïssir Heritier, R.J. -L Fétick, Olivier Fauvarque, Jean François Sauvage , et al. · 2025

Context . Reaching the high angular resolution and contrast level desired for exoplanetary science requires us to equip large telescopes with extreme adaptive optics (XAO) systems to compensate for the effect of the atmospheric turbulence …

How to describe Fourier filtering wavefront sensor nonlinearity with interaction matrices Open

Mahawa Cissé, Olivier Fauvarque, Vincent Chambouleyron, Nicolas Levraud, Charlotte Z. Bond , et al. · 2025

International audience

La mesure de surface d'onde par Shack-Hartmann Open

Vincent Michau, Thierry Fusco · 2025

Le Shack-Hartmann est un analyseur largement utilisé en optique adaptative et en métrologie. La mesure repose sur un réseau de microlentilles qui échantillonne la surface d’onde. Les images obtenues permettent d’accéder aux pentes locales,…

Performance comparison of the Shack-Hartmann and pyramid wavefront sensors with a laser guide star for 40 m telescopes Open

Francisco Oyarzún, Vincent Chambouleyron, Benoît Neichel, Thierry Fusco, Andrés Guesalaga · 2024

Context . Upcoming giant segmented mirror telescopes will use laser guide stars (LGS) for their adaptive optics (AO) systems. Two options of wavefront sensors (WFSs) are the Shack-Hartmann wavefront sensor (SHWFS) and the pyramid wavefront…

PAPYRUS: from an adaptive optics system to an instrumental platform Open

Romain Fétick, Thierry Fusco, Arnaud Striffling, Eduard Muslimov, Jean-François Sauvage , et al. · 2024

International audience

PROVIDENCE: toward a 2.5m adaptive telescope for optical space domain awareness (but not only…) Open

C. Petit, Thierry Fusco, Nicolas Védrenne, Jean-François Sauvage, Gillian Leplat , et al. · 2024

International audience

RISTRETTO: a VLT XAO design to reach Proxima Cen b in the visible Open

Nicolas Blind, Muskan Shinde, Isaac Bernardino Dinis, Nathanaël Restori, Bruno Chazelas , et al. · 2024

RISTRETTO is the evolution of the original idea of coupling the VLT\ninstruments SPHERE and ESPRESSO \\cite{lovis_2016a}, aiming at High Dispersion\nCoronagraphy. RISTRETTO is a visitor instrument that should enable the\ncharacterization o…

Using a pyramid wavefront sensor off-zero: from theory to practice Open

Arnaud Striffling, Cédric Taïssir Héritier, Romain Fétick, Jean-François Sauvage, Alexis Carlotti , et al. · 2024

International audience

HARMONI at ELT: towards final designs and AIT strategies for SCAOS sub-system in NGSS Open

Jean-François Sauvage, Zalpha Challita, Edgard Renault, William Bon, Alexandre Bozier , et al. · 2024

International audience

RISTRETTO: reflected-light exoplanet spectroscopy at the diffraction limit of the VLT Open

C. Lovis, Nicolas Blind, Bruno Chazelas, Muskan Shinde, Maddalena Bugatti , et al. · 2024

RISTRETTO is a visible high-resolution spectrograph fed by an extreme\nadaptive optics (AO) system, to be proposed as a visitor instrument on ESO VLT.\nThe main science goal of RISTRETTO is to pioneer the detection and atmospheric\ncharact…

Advancements in estimating differential pistons for the Extremely Large Telescope using deep learning Open

Pierre Janin-Potiron, Morgan Gray, Benoît Neichel, Maxime Dumont, Jean-François Sauvage , et al. · 2024

International audience

Striving towards robust phase diversity on-sky: Implementing LIFT for VLT/MUSE-NFM Open

Arseniy Kuznetsov, Sylvain Oberti, Benoît Neichel, Thierry Fusco · 2024

The recent IRLOS upgrade for VLT/MUSE narrow field mode (NFM) introduced a full-pupil mode to enhance sensitivity and sky coverage. This involved replacing the 2x2 Shack-Hartmann sensor with a single lens for full-aperture photon collectio…

Striving towards robust phase diversity on-sky Open

Arseniy Kuznetsov, Sylvain Oberti, Benoît Neichel, Thierry Fusco · 2024

Context. The recent IRLOS upgrade for VLT/MUSE narrow field mode (NFM) introduced a full-pupil mode to enhance sensitivity and sky coverage. This involved replacing the 2 × 2 Shack-Hartmann sensor with a single lens for full-aperture photo…

Cassiopée, towards technological development for XAO on ELT: the e-APD infrared detector Open

Jean-Luc Gach, Piero Bruno, Julien Charton, Philippe Feautrier, Thierry Fusco , et al. · 2024

The Cassiopée project aims to develop the key technologies that will be used to deploy very high-performance Adaptive Optics for future ELTs. The ultimate challenge is to detect earth-like planets and characterize the composition of their …

Expected performance of the Pyramid wavefront sensor with a laser guide star for 40 m class telescopes Open

Francisco Oyarzún, Vincent Chambouleyron, Benoît Neichel, Thierry Fusco, Andrés Guesalaga · 2024

Context. The use of artificial laser guide stars (LGS) is planned for the new generation of giant segmented mirror telescopes in order to extend the sky coverage of their adaptive optics systems. The LGS, being a 3D object at a finite dist…

A strategy for sensing the petal mode in the presence of AO residual turbulence with the pyramid wavefront sensor Open

Nicolas Levraud, Vincent Chambouleyron, Jean François Sauvage, Benoît Neichel, Mahawa Cissé , et al. · 2024

Context . With the Extremely Large Telescope (ELT) generation of telescopes come new challenges. The complexity of these telescopes’ pupils creates new problems for adaptive optics (AO) that prevent the telescopes from reaching the theoret…

Propagation channel assessment for GEO feeder links Open

Laurie Paillier, Yann Lai-Tim, Alex Poiron, Emile Klotz, Sidonie Lefèbvre , et al. · 2023

International audience

HARMONI at ELT: prototyping for Single-Conjugate AO Sensor subsystem (Erratum) Open

Kacem El Hadi, Jean-François Sauvage, Kjetil Dohlen, Edgard Renault, William Bon , et al. · 2023

Publisher's Note: This paper, originally published on 29 August 2022, was replaced with a corrected/revised version on 15 September 2023. If you downloaded the original PDF but are unable to access the revision, please contact SPIE Digital…

Assessment of adaptive optics‐corrected optical links statistics from integrated turbulence parameters through a Gaussian process metamodel Open

Emile Klotz, Sidonie Lefèbvre, Nicolas Védrenne, Christian Musso, Sylvain Poulenard , et al. · 2023

Summary With the development of free space optical links (FSO) for space‐ground communications comes the need to mitigate the effects of the atmospheric turbulence to guarantee a lossless connection. By having a network of addressable grou…

Optique adaptative et telescopes geants Open

Thierry Fusco · 2023

L’optique adaptative, installée sur tous les très grands télescopes astronomiques, permet de s’affranchir des limitations imposées par les perturbations de la turbulence atmosphérique. Cet article présente l’état de l’art du domaine pour l…

Forecasting of turbulence impact on optical link from geostationary satellite Open

Emile Klotz, Sidonie Lefèbvre, Nicolas Védrenne, Christian Musso, Thierry Fusco , et al. · 2023

International audience

Optique adaptative : correction des effets de la turbulence atmosphérique sur les images astronomiques Open

Gérard Rousset, Thierry Fusco · 2023

L’optique adaptative (OA), installée aujourd’hui sur tous les très grands télescopes astronomiques, permet de s’affranchir de la limitation en résolution angulaire imposée aux grands télescopes au sol par les perturbations de la turbulence…

Improvement of satellite-to-ground QKD secret key rate with adaptive optics Open

Valentina Marulanda Acosta, Daniele Dequal, Matteo Schiavon, Aurélie Montmerle-Bonnefois, Caroline B. Lim , et al. · 2023

International audience

The high-albedo, low polarization disk around HD 114082 that harbors a Jupiter-sized transiting planet Open

N. Engler, J. Milli, R. Gratton, Solène Ulmer-Moll, A. Vigan , et al. · 2023

Aims. We present new optical and near-infrared images of the debris disk around the F-type star HD 114082 in the Scorpius-Centaurus OB association. We obtained direct imaging observations and analyzed the TESS photometric time series data …

Modeling noise propagation in Fourier-filtering wavefront sensing, fundamental limits, and quantitative comparison Open

Vincent Chambouleyron, Olivier Fauvarque, Cédric Plantet, J.-F. Sauvage, Nicolas Levraud , et al. · 2023

Context. Adaptive optics (AO) is a technique allowing for ground-based telescopes’ angular resolution to be improved drastically. The wavefront sensor (WFS) is one of the key components of such systems, driving the fundamental performance …

Prediction of AO corrected PSF for SPHERE / AOF NFM. Open

Arseniy Kuznetsov, Benoît Neichel, Sylvain Oberti, Thierry Fusco · 2023

The prediction of Adaptive Optics (AO)-corrected PSFs offers considerable potential, with implications ranging from enhanced observational planning to the post-processing of astronomical data. The intricate nature of AO-corrected PSFs nece…

Toward the full control of NCPA with the pyramid wavefront sensor: mastering the optical gains Open

Arnaud Striffling, Cédric Taïssir Héritier, Jean-François Sauvage, Alexis Carlotti, Olivier Fauvarque , et al. · 2023

The pyramid wavefront sensor is an asset for an AO system thanks to its sensitivity. However, because its a nonlinear sensor it comes with operational challenges. A convolutional method and a gain sensing camera allow to track the optical …

Design and challenges for the HARMONI Laser Guide Star Sensors Open

A. Costille, Edgard Renault, Anne Bonnefoi, William Ceria, Kjetil Dohlen , et al. · 2023

HARMONI is the first light visible and near-IR integral field spectrograph for the ELT. It covers a large spectral range from 450nm to 2450nm with resolving powers from 3500 to 18000 and spatial sampling from 60mas to 4mas. It can operate …

Results from the the Harmoni Laser Guide Star wavefront sensor prototype Open

Paul Rouquette, Pierre Jouve, A. Costille, Benoît Neichel, Kjetil Dohlen , et al. · 2023

The impact of the microlens profiles on the optical adaptative performances of the Harmoni LGSS is analyzed. Starting from measurements of microlens surfaces, an optical model has been developed that allows to get light intensity distribut…

PAPYRUS: Design and integration of the Shack-Hartmann branch Open

François Leroux, Mojtaba Taheri, Idir Boudjema, Bruno Martin, Armin Schimpf , et al. · 2023

The PAPYRUS project is an adaptive optics bench installed on a 1.5 meter telescope at the Haute-Provence Observatory in south of France. Since the first light of the instrument in June 2022, it has now undergone one year of on-sky experime…

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