172 citations · 599 across the 49 of their papers we have counts for
50 papers
Wavefront sensing with a Gradient Phase Filter
F. Henault, Y. Feng, J. -J. Correia +2
Wavefront sensors have now become core components in the fields of metrology of optical systems, biomedical optics, and adaptive optics systems for astronomy. However, none of the…
Remote Measurement of Heliostat Reflectivity with the Backward Gazing Procedure
Francois Henault
Concentrated solar power is a promising technique enabling renewable energy production with large scale solar power plants in the near future. Estimating quantitatively the reflect…
The crossed-sine wavefront sensor: first tests and results
Laura Schreiber, Yan Feng, Alain Spang +4
The crossed-sine wavefront sensor (WFS) is a pupil plane wavefront sensor that measures the first derivatives of the wavefront. It is made by three main components: a gradient tran…
Lord of the Ring Gratings: Their use as image plane filters for coronagraphy
Francçois Henault
Coronagraphy is an efficient technique for identifying and characterizing extra-solar planets orbiting in the habitable zone of their parent star. An important family of coronagrap…
Nulling interferometry in space does not require a rotating telescope array
Francois Henault
Space borne nulling interferometry in the mid-infrared waveband is one of the most promising techniques for characterizing the atmospheres of extra-solar planets orbiting in the ha…
Field of View and contrast limitations of stellar interferometers. A quick review
Francois Henault
Field of View (FoV) and contrast limitations of stellar interferometers have been the scope of numerous publications for more than thirty years. Recently, this topic regained some…
MAORY: A Multi-conjugate Adaptive Optics RelaY for ELT
Paolo Ciliegi, Guido Agapito, Matteo Aliverti +73
MAORY is the adaptive optics module for ELT providing two gravity invariant ports with the same optical quality for two different client instruments. It enable high angular resolut…
SPIRou: nIR velocimetry & spectropolarimetry at the CFHT
J. -F. Donati, D. Kouach, C. Moutou +63
This paper presents an overview of SPIRou, the new-generation near-infrared spectropolarimeter / precision velocimeter recently installed on the 3.6-m Canada-France-Hawaii Telescop…
New concepts for calibrating non-common path aberrations in adaptive optics and coronagraph systems
Francois Henault
Non Common Path Aberrations (NCPA) are often considered as a critical issue in Adaptive Optics (AO) systems, since they introduce bias errors between real wavefronts propagating to…
Hartmann vs. reverse Hartmann test: a Fourier optics point of view
Francois Henault, Cyril Pannetier
The Shack-Hartmann Wavefront Sensor (WFS) is well-known in the fields of optical metrology, wavefront sensing in astronomy, and ophthalmologic control applications. The purpose of…
Hi-5: a potential high-contrast thermal near-infrared imager for the VLTI
D. Defrère, M. Ireland, O. Absil +25
Hi-5 is a high-contrast (or high dynamic range) infrared imager project for the VLTI. Its main goal is to characterize young extra-solar planetary systems and exozodiacal dust arou…
Analysis of azimuthal phase mask coronagraphs
Francois Henault
In this paper is presented an analytical study of the azimuthal phase-mask coronagraph currently envisioned for detecting and characterizing extra-solar planets. Special emphasis i…
The path towards high-contrast imaging with the VLTI: the Hi-5 project
D. Defrère, O. Absil, J. -P. Berger +26
The development of high-contrast capabilities has long been recognized as one of the top priorities for the VLTI. As of today, the VLTI routinely achieves contrasts of a few 10$^{-…
Cherenkov Telescope Array Contributions to the 35th International Cosmic Ray Conference (ICRC2017)
F. Acero, B. S. Acharya, V. Acín Portella +1137
List of contributions from the Cherenkov Telescope Array Consortium presented at the 35th International Cosmic Ray Conference, July 12-20 2017, Busan, Korea.
Phase-shifting coronagraph
François Hénault, Alexis Carlotti, Christophe Vérinaud
With the recent commissioning of ground instruments such as SPHERE or GPI and future space observatories like WFIRST-AFTA, coronagraphy should probably become the most efficient to…
NectarCAM, a camera for the medium sized telescopes of the Cherenkov Telescope Array
J-F. Glicenstein, M. Shayduk
NectarCAM is a camera proposed for the medium-sized telescopes of the Cherenkov Telescope Array (CTA) which covers the core energy range of ~100 GeV to ~30 TeV. It has a modular de…
A detector interferometric calibration experiment for high precision astrometry
A. Crouzier, F. Malbet, F. Henault +23
Context: Exoplanet science has made staggering progress in the last two decades, due to the relentless exploration of new detection methods and refinement of existing ones. Yet ast…
The latest results from DICE (Detector Interferometric Calibration Experiment)
A. Crouzier, F. Malbet, F. Henault +23
Theia is an astrometric mission proposed to ESA in 2014 for which one of the scientific objectives is detecting Earth-like exoplanets in the habitable zone of nearby solar-type sta…
Collimating Slicer for Optical Integral Field Spectroscopy
Florence Laurent, Francois Henault
Integral Field Spectroscopy (IFS) is a technique that gives simultaneously the spectrum of each spatial sampling element in a given object field. It is a powerful tool which rearra…
Optical design of a multi-resolution, single shot spectrograph
Francois Henault, Florence Laurent
Multi-object or integral field spectrographs are recognized techniques for achieving simultaneous spectroscopic observations of different or extended sky objects with a high multip…
Experimental demonstration of a crossed cubes nuller for coronagraphy and interferometry
Francois Henault, Brahim Arezki, Guillaume Bourdarot +1
In this communication we present the first experimental results obtained on the Crossed-cubes nuller (CCN), that is a new type of Achromatic phase shifter (APS) based on a pair of…
Analysis of nulling phase functions suitable to image plane coronagraphy
Francois Henault, Alexis Carlotti, Christophe Verinaud
Coronagraphy is a very efficient technique for identifying and characterizing extra-solar planets orbiting in the habitable zone of their parent star, especially when used in a spa…
Quantum physics and the beam splitter mystery
Francois Henault
Optical lossless beam splitters are frequently encountered in fundamental physics experiments regarding the nature of light, including "which-way" determination of light particles,…
Fully achromatic nulling interferometer (FANI) for high SNR exoplanet characterization
Francois Henault
Space-borne nulling interferometers have long been considered as the best option for searching and characterizing extra-solar planets located in the habitable zone of their parent…