Emmanuel Chirre,1 Gaetano Sivo,1 Julia Scharwaechter,2 Celia Blain,2 Marcos Van Dam,3 Andrew Rakich4
1NSF's National Optical-Infrared Astronomy Research Lab. (Chile) 2NSF's National Optical-Infrared Astronomy Research Lab. (United States) 3Flat Wavefronts (New Zealand) 4Mersenne Optical Consulting, Ltd. (New Zealand)
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The Gemini North Adaptive Optics (GNAO) project will deliver the first ground-based Adaptive Optics (AO) facility for wide-field studies on Mauna Kea in Hawaii. This document presents the potential optical design of a Multi-Conjugate Adaptive Optics (MCAO) instrument. In the aim of designing an instrument with enhanced performance, a design based on a Modified Offner Concentric relay is proposed as an alternative option to the pair of unmatched off-axis parabolic mirrors. A diffraction-limited image quality is achieved in the NIR domain over a wide field-of-view of 60-arcsec radius. Petzval field curvature is cancelled and static optical distortion is reduced by a factor of 4 at the image plane. This work shows the Modified Offner Concentric relay is a feasible design for the wide-field AO instrumentation of the 8.1-meter Gemini North telescope.
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Emmanuel Chirre, Gaetano Sivo, Julia Scharwaechter, Celia Blain, Marcos Van Dam, Andrew Rakich, "Potential optical design of a multi-conjugate adaptive optics instrument based on a modified Offner concentric relay for Gemini North," Proc. SPIE 11448, Adaptive Optics Systems VII, 114487F (13 December 2020); https://doi.org/10.1117/12.2574810