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MOSAIC optical relay module: optical design, performance, and flexure analysis

Calcines, Ariadna and Dubbeldam, Marc and Morris, Timothy J. and Fitzsimons, Ewan and Schnetler, Hermine and Cohen, Mathieu and Amans, Jean-Philippe (2018) 'MOSAIC optical relay module: optical design, performance, and flexure analysis.', in Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII. .


The Optical Relay Module of the MOSAIC multiple-object spectrograph is used to relay 400-1800nm light picked off from the ELT focal plane to either a fibre-based integral field unit or a natural guide star wavefront sensor. Here we present the preliminary optical design offering a telecentric exit beam with a focal-ratio of F/17.718 and the opto-mechanical analysis of flexures with a study of the impact in the optical layout performances such as: deviation of the PSF centroid, tip-tilt of the image focal plane, variations of the wavefront error, optical quality and pupil wandering at the deformable mirror position.

Item Type:Book chapter
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Publisher statement:Copyright (2018) Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Date accepted:No date available
Date deposited:17 January 2023
Date of first online publication:11 July 2018
Date first made open access:17 January 2023

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