Jean-François Sauvage
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View article: How to describe Fourier filtering wavefront sensor nonlinearity with interaction matrices
How to describe Fourier filtering wavefront sensor nonlinearity with interaction matrices Open
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View article: PAPYRUS: from an adaptive optics system to an instrumental platform
PAPYRUS: from an adaptive optics system to an instrumental platform Open
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View article: PROVIDENCE: toward a 2.5m adaptive telescope for optical space domain awareness (but not only…)
PROVIDENCE: toward a 2.5m adaptive telescope for optical space domain awareness (but not only…) Open
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View article: RISTRETTO: a VLT XAO design to reach Proxima Cen b in the visible
RISTRETTO: a VLT XAO design to reach Proxima Cen b in the visible Open
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…
View article: Using a pyramid wavefront sensor off-zero: from theory to practice
Using a pyramid wavefront sensor off-zero: from theory to practice Open
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View article: HARMONI at ELT: towards final designs and AIT strategies for SCAOS sub-system in NGSS
HARMONI at ELT: towards final designs and AIT strategies for SCAOS sub-system in NGSS Open
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View article: RISTRETTO: reflected-light exoplanet spectroscopy at the diffraction limit of the VLT
RISTRETTO: reflected-light exoplanet spectroscopy at the diffraction limit of the VLT Open
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…
View article: Advancements in estimating differential pistons for the Extremely Large Telescope using deep learning
Advancements in estimating differential pistons for the Extremely Large Telescope using deep learning Open
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View article: Cassiopée, towards technological development for XAO on ELT: the e-APD infrared detector
Cassiopée, towards technological development for XAO on ELT: the e-APD infrared detector Open
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 …
View article: Phasing segmented telescopes via deep learning methods: application to a deployable CubeSat
Phasing segmented telescopes via deep learning methods: application to a deployable CubeSat Open
Capturing high-resolution imagery of the Earth’s surface often calls for a telescope of considerable size, even from low Earth orbits (LEOs). A large aperture often requires large and expensive platforms. For instance, achieving a resoluti…
View article: The polarisation properties of the HD 181327 debris ring
The polarisation properties of the HD 181327 debris ring Open
Context . Polarisation is a powerful remote-sensing tool to study the nature of particles scattering the starlight. It is widely used to characterise interplanetary dust particles in the Solar System and increasingly employed to investigat…
View article: The polarisation properties of the HD 181327 debris ring. Evidence for sub-micron particles from scattered light observations
The polarisation properties of the HD 181327 debris ring. Evidence for sub-micron particles from scattered light observations Open
Polarisation is a powerful remote-sensing tool to study the nature of particles scattering the starlight. It is widely used to characterise interplanetary dust particles in the Solar System and increasingly employed to investigate extrasol…
View article: HARMONI at ELT: prototyping for Single-Conjugate AO Sensor subsystem (Erratum)
HARMONI at ELT: prototyping for Single-Conjugate AO Sensor subsystem (Erratum) Open
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…
View article: Estimating the ELT's Differential Pistons with Deep Learning
Estimating the ELT's Differential Pistons with Deep Learning Open
High angular resolution requires large telescope apertures, which in turn often require segmented pupils. This is particularly true for large optical and infrared ground-based telescopes such as the Extremely Large Telescope (ELT). Due to …
View article: Toward the full control of NCPA with the pyramid wavefront sensor: mastering the optical gains
Toward the full control of NCPA with the pyramid wavefront sensor: mastering the optical gains Open
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 …
View article: Design and prototyping of HARMONI's light-injection module for AO calibrations
Design and prototyping of HARMONI's light-injection module for AO calibrations Open
In this paper, we present the design of the Adaptive Optics Calibration Unit (AOCU) of the HARMONI instrument, focusing on the light-injection module. We present theoretical photometric budget and evaluate experimental performance in the l…
View article: Impact of DM misregistration for NCPA compensation in HARMONI's SCAO system
Impact of DM misregistration for NCPA compensation in HARMONI's SCAO system Open
Non-Common Path Aberration (NCPA) compensation is crucial for good image quality, especially for high contrast operations. In SCAO mode HARMONI will use a calibration deformable mirror (DM) in conjunction with of low-order DM to calibrate …
View article: Deep learning for low-order phasing of segmented telescopes
Deep learning for low-order phasing of segmented telescopes Open
Earth observation from space has greatly benefited from advancements in angular resolution, which are essential for obtaining valuable scientific insights. Achieving high angular resolution relies on large telescope apertures. Recently, sp…
View article: PAPYRUS: Second stage adaptive optics with a vector Zernike wavefront sensor
PAPYRUS: Second stage adaptive optics with a vector Zernike wavefront sensor Open
The Provence Adaptive optics PYramid Run System (PAPYRUS) is a pyramid-based Adaptive Optics (AO) system installed at the Coude focus of the 1.52m telescope (T152) at the Observatoire de Haute Provence (OHP). PAPYRUS is a young researcher …
View article: Modeling noise propagation in Fourier-filtering wavefront sensing, fundamental limits and quantitative comparison
Modeling noise propagation in Fourier-filtering wavefront sensing, fundamental limits and quantitative comparison Open
Adaptive optics (AO) is a technique allowing to drastically improve ground-based telescopes angular resolution. The wavefront sensor (WFS) is one of the key components of such systems, driving the fundamental performance limitations. In th…
View article: Feasibility demonstration of AO pre-compensation for GEO feeder links in a relevant environment
Feasibility demonstration of AO pre-compensation for GEO feeder links in a relevant environment Open
Optical technologies are extremely competitive candidates to achieve very-high throughput links between ground and GEO satellites; however, their feasibility relies on the ability to mitigate channel impairments due to atmospheric turbulen…
View article: Three-sided pyramid wavefront sensor, part II: preliminary demonstration on the new comprehensive adaptive optics and coronagraph test instrument testbed
Three-sided pyramid wavefront sensor, part II: preliminary demonstration on the new comprehensive adaptive optics and coronagraph test instrument testbed Open
The next generation of giant ground and space telescopes will have the light-collecting power to detect and characterize potentially habitable terrestrial exoplanets using high-contrast imaging for the first time. This will only be achieva…
View article: Three-sided pyramid wavefront sensor. II. Preliminary demonstration on the new CACTI testbed
Three-sided pyramid wavefront sensor. II. Preliminary demonstration on the new CACTI testbed Open
The next generation of giant ground and space telescopes will have the light-collecting power to detect and characterize potentially habitable terrestrial exoplanets using high-contrast imaging for the first time. This will only be achieva…
View article: HARMONI at ELT: wavefront control in SCAO mode
HARMONI at ELT: wavefront control in SCAO mode Open
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View article: RISTRETTO: coronagraph and AO designs enabling High Dispersion Coronagraphy at 2 λ/D
RISTRETTO: coronagraph and AO designs enabling High Dispersion Coronagraphy at 2 λ/D Open
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View article: The phase-shifted Zernike wave-front sensor
The phase-shifted Zernike wave-front sensor Open
The next generation of Giant Fragmented Telescopes will allow the study of faint and distant objects such as exoplanets. But the structure of the telescope also brings new challenges such as pupil fragmentation or Low-Wind Effect (LWE) tha…
View article: Optimizing Fourier-filtering WFS to reach sensitivity close to the fundamental limit
Optimizing Fourier-filtering WFS to reach sensitivity close to the fundamental limit Open
To reach the full potential of the new generation of ground based telescopes, an extremely fine adjustment of the phase is required. Wavefront control and correction before detection has therefore become one of the cornerstones of instrume…
View article: High-contrast imager for complex aperture telescopes (HiCAT): 8. Dark zone demonstration with simultaneous closed loop low-order wavefront sensing and control
High-contrast imager for complex aperture telescopes (HiCAT): 8. Dark zone demonstration with simultaneous closed loop low-order wavefront sensing and control Open
We present recent laboratory results demonstrating high-contrast coronagraphy\nfor the future space-based large IR/Optical/Ultraviolet telescope recommended\nby the Decadal Survey. The High-contrast Imager for Complex Aperture Telescopes\n…
View article: RISTRETTO: high-resolution spectroscopy at the diffraction limit of the VLT
RISTRETTO: high-resolution spectroscopy at the diffraction limit of the VLT Open
RISTRETTO is a visible high-resolution spectrograph fed by an extreme adaptive optics (XAO) system, to be proposed as a visitor instrument on ESO VLT. The main science goal of RISTRETTO is the detection and atmospheric characterization of …
View article: Opto-mechanical model of AZIMOV, the deployable telescope for CubeSat
Opto-mechanical model of AZIMOV, the deployable telescope for CubeSat Open
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