The MICADO first light imager for the ELT: starting manufacturing of the relay optics

Santiago Barboza; André Boné; Ralf-Rainer Rohloff; Friedrich Müller; Ralph Hofferbert; José Ramos; Jörg-Uwe Pott; Norbert Münch; Armin Böhn; Tobias Stadler; Tobias Maurer; Peter Bizenberger; David Serrano; Wolfram Schlossmacher; Helmut Espig; James Mulherin; Christopher Hall; Michael DeMarco

doi:10.1117/12.3018243

18 July 2024 The MICADO first light imager for the ELT: starting manufacturing of the relay optics

Santiago Barboza, André Boné, Ralf-Rainer Rohloff, Friedrich Müller, Ralph Hofferbert, José Ramos, Jörg-Uwe Pott, Norbert Münch, Armin Böhn, Tobias Stadler, Tobias Maurer, Peter Bizenberger, David Serrano, Wolfram Schlossmacher, Helmut Espig, James Mulherin, Christopher Hall, Michael DeMarco

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130965E (2024) https://doi.org/10.1117/12.3018243
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

MICADO is the Multi-AO Imaging Camera for Deep Observations, a first light instrument for the Extremely Large Telescope (ELT). The instrument will be assisted by a Single-Conjugate Adaptive Optics (SCAO) system and the Multiconjugate adaptive Optics Relay For ELT Observations (MORFEO). MICADO can operate in the so-called standalone mode in the absence of MORFEO with the SCAO correction alone. The Relay Optics (RO), is the optical system relaying the ELT focal plane to an appropriate position inside the MICADO cryostat for that SCAO-only stand-alone observing mode. After successfully passing the Final Design Review (FDR), the manufacturing of the RO is in full swing. We present here the current status of the ongoing assembly, integration and verification campaign (AIV), together with its upcoming challenges. The RO consists of an optical bench made of carbon fiber reinforced plastic (CFRP), an optical assembly made of three flat, motorized tip-tilt-piston mirrors (M1, M5 and M6) and three powered mirrors (M2, M3 and M4) of up to ~500 mm in diameter, the MICADO calibration assembly (MCA) including its deployable unit with a flat mirror (MDU) and a cover to protect all opto-mechanical components on top of the bench. The fabrication of the mirrors has started, while the machining of the mirror mounts is well ahead. The optical bench, as well as all other CFRP parts have been ordered and the manufacturing is completed. In order to get optimum performance and minimal wavefront error (WFE), the mirrors are tested in their mounts before carrying out the final polishing operations. Therefore, all mirror mounts are scheduled to be delivered to the mirror vendor QED Optics by the end of 2024.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Santiago Barboza, André Boné, Ralf-Rainer Rohloff, Friedrich Müller, Ralph Hofferbert, José Ramos, Jörg-Uwe Pott, Norbert Münch, Armin Böhn, Tobias Stadler, Tobias Maurer, Peter Bizenberger, David Serrano, Wolfram Schlossmacher, Helmut Espig, James Mulherin, Christopher Hall, and Michael DeMarco "The MICADO first light imager for the ELT: starting manufacturing of the relay optics", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130965E (18 July 2024); https://doi.org/10.1117/12.3018243

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KEYWORDS

Mirrors

Manufacturing

Mirror mounts

Carbon fiber reinforced plastics

Optics manufacturing

Mirror surfaces

Optical benches

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