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 atmosphere. For this, imaging contrasts of the order of 10^9 are required, implying a leap forward in adaptive optics performance, with high density deformable mirrors (>100x100 actuators), low-noise cameras and the control of the loop at few kHz. The project brings together 2 industrial partners: First Light Imaging and ALPAO, and 2 academic partners: ONERA and LAM, who will work together to develop a new camera for WFSensing, a new deformable mirror and their implementation in an AO loop.
Optical Space Domain Awareness (SDA) aims to provide high-quality angular (and possibly spectral/polarimetric) information on LEO and GEO satellites for object characterization and identification. In terms of spatial resolution, the goal is to achieve decimetric resolution for low-Earth orbit and decametric resolution for geostationary orbit (in order to monitor the satellites' immediate environment). This ambitious objective can only be achieved by combining a large telescope, a dedicated AO system optimized for the specific characteristics of SDA, differential imaging capabilities and post-processing techniques ranging from Point Spread Function estimation to data fusion, including multi-frame deconvolution. We will present an overview of the key ingredients required to achieve an efficient and operational system and the status of ONERA's new project called PROVIDENCE. It is based on a 2.5m adaptive optics telescope optimized for SDA activities. It will be installed at Observatoire de Haute Provence (in south of France) and should see its first light at the end of 2028.
PAPYRUS is an adaptive optics bench setup on the telescope T152, 1.52m diameter, of Observatoire de Haute Provence (OHP, France) since June 2022. This bench has been designed for research and development in adaptive optics and educational purposes. However it gained in maturity since its first light and is now evolving towards an instrumental platform, including infrared capacities (imager, fiber injection module). So equipped, the bench will mature concepts and techniques coupling adaptive optics and their associated instruments, for future systems such as the 2.5m PROVIDENCE system that will also be located at OHP or for the HARMONI instrument to be installed at ELT. PAPYRUS features a four-sided pyramid in front of an EMCCD camera working in broadband visible and a deformable mirror made of 241 actuators. We review here the current status of the bench, its performances and its on-going developments.
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