High order test bench for extreme adaptive optics system optimization

Emmanuel Aller-Carpentier, Markus Kasper, Patrice Martinez, Elise Vernet, Enrico Fedrigo, Christian Soenke, Sébastien Tordo, Norbert Hubin, Christophe Verinaud, Simone Esposito, Enrico Pinna, Alfio Puglisi (+9 others)
2008 Adaptive Optics Systems  
High-contrast imagers dedicated to the search for extrasolar planets are currently being developed for the VLT (SPHERE) and Gemini (GPI) observatories. A vital part of such a high-contrast imager is the extreme adaptive optics (XAO) system that very efficiently removes effects of atmospheric turbulence and instrument aberrations. The high order test bench (HOT) implements an XAO system under realistic telescope conditions reproduced by star and turbulence generators. New technological
more » ... ts (32x32 actuator micro deformable mirror, read-noise free electron multiplying CCD60, SPARTA real time computer) are used to study and compare two potential XAO wave front sensors: The Pyramid-and the Shack-Hartmann wave front sensors. We will describe the overall design of HOT including the sub-systems. We will present the closed loop study results of the behavior of the Shack-Hartmann wave front sensor in terms of linearity, sensitivity to calibration errors, performance and other specific issues.
doi:10.1117/12.788710 fatcat:r24fw6bnp5dincuszy4cogplei