172 citations · 599 across the 49 of their papers we have counts for
12 papers · 1 filter
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…
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…
Phase-shifting technique for improving the imaging capacity of sparse-aperture optical interferometers
Francois Henault
In this paper, we describe the principle of a multi-aperture interferometer that uses a phase-shifting technique and is suitable for quick, snapshot imaging of astrophysical object…
PSF and field of view characteristics of imaging and nulling interferometers
François Hénault
In this communication are presented some complements to a recent paper entitled "Simple Fourier optics formalism for high angular resolution systems and nulling interferometry", de…
Multi-spectral piston sensor for co-phasing giant segmented mirrors and multi-aperture interferometric arrays
Francois Henault
This paper presents the optical design of a multi-spectral piston sensor suitable to co-phasing giant segmented mirrors equipping the Future Extremely Large Telescopes (ELTs). The…
Simple Fourier optics formalism for high angular resolution systems and nulling interferometry
Francois Henault
In this paper are reviewed various designs of advanced, multi-aperture optical systems dedicated to high angular resolution imaging or to the detection of exo-planets by nulling in…
Telescope interferometers: an alternative to classical wavefront sensors
Francois Henault
Several types of Wavefront Sensors (WFS) are nowadays available in the field of Adaptive Optics (AO). Generally speaking, their basic principle consists in measuring slopes or curv…
Computing extinction maps of star nulling interferometers
Francois Henault
Herein is discussed the performance of spaceborne nulling interferometers searching for extra-solar planets, in terms of their extinction maps projected on-sky. In particular, it i…
Signal-to-noise ratio of phase sensing telescope interferometers
Francois Henault
This paper is the third part of a trilogy dealing with the principles, performance and limitations of what I named "Telescope-Interferometers" (TIs). The basic idea consists in tra…
Conceptual design of a phase shifting telescope-interferometer
Francois Henault
This paper deals with the theoretical principle and optical design of a phase-shifting telescope-interferometer. What is called a "Telescope-Interferometer" (T-I) is indeed a novel…
An analysis of stellar interferometers as wavefront sensors
Francois Henault
This paper presents the basic principle and theoretical relationships of an original method allowing to retrieve the Wavefront Errors (WFE) of a ground or space-borne telescope whe…
Wavefront sensor based on varying transmission filters: theory and expected performance
Francois Henault
The use of Wavefront Sensors (WFS) is nowadays fundamental in the field of instrumental optics. This paper discusses the principle of an original and recently proposed new class of…