The MICADO first light imager for the ELT: relay optics opto-mechanical design

Santiago Barboza; Gabriele Rodeghiero; Robert J. Harris; José Ramos; Jörg-Uwe Pott; Ralf-Rainer Rohloff; Friedrich Müller; Ralph Hofferbert; Peter Bizenberger; Norbert Münch; Armin Böhm; Lars Mohr; Vianak Naranjo; Jörg Wagner; Wolfram Schlossmacher; Sebastian Rabien; Veronika Hörmann; Alejandro Farah

doi:10.1117/12.2559930

13 December 2020 The MICADO first light imager for the ELT: relay optics opto-mechanical design

Santiago Barboza, Gabriele Rodeghiero, Robert J. Harris, José Ramos, Jörg-Uwe Pott, Ralf-Rainer Rohloff, Friedrich Müller, Ralph Hofferbert, Peter Bizenberger, Norbert Münch, Armin Böhm, Lars Mohr, Vianak Naranjo, Jörg Wagner, Wolfram Schlossmacher, Sebastian Rabien, Veronika Hörmann, Alejandro Farah

Author Affiliations +

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 114472D (2020) https://doi.org/10.1117/12.2559930
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

MICADO is the Multi-AO Imaging Camera for Deep Observations, a first light instrument for the Extremely Large Telescope (ELT). The instrument provides imaging, astrometric, spectroscopic and coronographic observing modes. MICADO will be assisted by a Single-Conjugate Adaptive Optics (SCAO) system and the Multi-conjugate Adaptive Optics RelaY (MAORY). The instrument will provide a narrow (19′′) and a wide (51”) Field of View. MICADO can operate in the so-called stand-alone mode in the absence of MAORY with the SCAO correction alone. Here, we present the opto-mechanical design of the Relay Optics (RO), the optical system relaying the ELT focal plane to an accessible position for MICADO using the SCAO-only stand-alone observing mode. The RO consists of an optical bench made of carbon fiber reinforced plastic (CFRP), an optical assembly made of three flat mirrors with motorized piston-tip-tilt mounts and three additional powered mirrors of up to ~500 mm in diameter, the MICADO calibration assembly, and a cover to protect all opto-mechanical components on top of the bench. A 9-point whiffletree support, combined with a thermal compensation system is implemented for the critical mirrors. The static and the dynamic performance of the MICADO RO are investigated through a detailed Finite Element Model (FEM), the results are combined with a Zernike basis representation of the mirror surface deformations performed in Zemax for assessing the optical performance.

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Santiago Barboza, Gabriele Rodeghiero, Robert J. Harris, José Ramos, Jörg-Uwe Pott, Ralf-Rainer Rohloff, Friedrich Müller, Ralph Hofferbert, Peter Bizenberger, Norbert Münch, Armin Böhm, Lars Mohr, Vianak Naranjo, Jörg Wagner, Wolfram Schlossmacher, Sebastian Rabien, Veronika Hörmann, and Alejandro Farah "The MICADO first light imager for the ELT: relay optics opto-mechanical design", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 114472D (13 December 2020); https://doi.org/10.1117/12.2559930

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