MISTRAL is a visible and near infrared imager and spectrograph working with the 1.93m telescope at L’Observatoire de Haute-Provence. The goal of the present project is to design and build one custom lens covering the entire working band 370 − 1000nm with an enhanced throughput and resolution. The proposed design has the focal length of 100mm with f/# = 2 and consists of 5 lenses with 2 aspheres. It is capable to work in spectroscopy or direct imaging mode with the spectral resolving power up to R590 − 1675 or energy concentration of 84% within ±1pix. The throughput varies from 79to98% in the main band of 400-1000nm with a commercial AR coating and could be yet improved with a custom one. We also demonstrate that with this image quality can be maintained in a ≤ 10% margin with practically reachable tolerances.
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.
The Provence Adaptive optics Pyramid Run System (PAPYRUS) is a pyramid-based Adaptive Optics (AO) system that will be installed at the Coude focus of the 1.52m telescope (T152) at the Observatoire de Haute Provence (OHP). The project is being developed by PhD students and Postdocs across France with support from staff members consolidating the existing expertise and hardware into an RD testbed. This testbed allows us to run various pyramid wavefront sensing (WFS) control algorithms on-sky and experiment on new concepts for wavefront control with additional benefit from the high number of available nights at this telescope. It will also function as a teaching tool for students during the planned AO summer school at OHP. To our knowledge, this is one of the first pedagogic pyramid-based AO systems on-sky. The key components of PAPYRUS are a 17x17 actuators Alpao deformable mirror with a Alpao RTC, a very low noise camera OCAM2k, and a 4-faces glass pyramid. PAPYRUS is designed in order to be a simple and modular system to explore wavefront control with a pyramid WFS on sky. We present an overview of PAPYRUS, a description of the opto-mechanical design and the current status of the project.
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