Potential optical design of a multi-conjugate adaptive optics instrument based on a modified Offner concentric relay for Gemini North

Emmanuel Chirre; Gaetano Sivo; Julia Scharwaechter; Celia Blain; Marcos Van Dam; Andrew Rakich

doi:10.1117/12.2574810

13 December 2020 Potential optical design of a multi-conjugate adaptive optics instrument based on a modified Offner concentric relay for Gemini North

Emmanuel Chirre, Gaetano Sivo, Julia Scharwaechter, Celia Blain, Marcos Van Dam, Andrew Rakich

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Proceedings Volume 11448, Adaptive Optics Systems VII; 114487F (2020) https://doi.org/10.1117/12.2574810
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

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Abstract

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, and 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

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