58 citations · 273 across the 32 of their papers we have counts for
5 papers · 1 filter
Active optics for high-dynamic variable curvature mirrors
Emmanuel Hugot, Marc Ferrari, Gerard R. Lemaitre +5
Variable curvature mirrors of large amplitude are designed by using finite element analysis. The specific case studied reaches at least a 800 μm sag with an optical quality better…
Design and development of a freeform active mirror for an astronomy application
Zalpha Challita, Tibor Agócs, Emmanuel Hugot +10
The advent of extremely large telescopes will bring unprecedented light-collecting power and spatial resolution, but it will also lead to a significant increase in the size and com…
Compensation of high-order quasi-static aberrations on SPHERE with the coronagraphic phase diversity (COFFEE)
B. Paul, J. -F. Sauvage, L. M. Mugnier +6
The second-generation instrument SPHERE, dedicated to high-contrast imaging, will soon be in operation on the European Very Large Telescope. Such an instrument relies on an extreme…
Local ensemble transform Kalman filter, a fast non-stationary control law for adaptive optics on ELTs: theoretical aspects and first simulation results
Morgan Gray, Cyril Petit, Sergey Rodionov +4
We propose a new algorithm for an adaptive optics system control law, based on the Linear Quadratic Gaussian approach and a Kalman Filter adaptation with localizations. It allows t…
High-contrast imager for Complex Aperture Telescopes (HiCAT): 2. Design overview and first light results
Mamadou N'Diaye, Elodie Choquet, Sylvain Egron +13
We present a new high-contrast imaging testbed designed to provide complete solutions in wavefront sensing, control and starlight suppression with complex aperture telescopes. The…