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CUBES: application of image slicers to reformat the field for two spectral resolving powers

Calcines Rosario, Ariadna Z. and Wells, Martyn and O’Brien, Kieran S. and Morris, Simon L. and Seifert, Walter and Zanutta, Alessio and Evans, Chris and Di Marcantonio, Paolo (2022) 'CUBES: application of image slicers to reformat the field for two spectral resolving powers.', in Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; SPIE Astronomical Telescopes + Instrumentation. .


The Cassegrain U-Band Efficient Spectrograph (CUBES) is a high-efficiency spectrograph designed for observations from 305 to 400nm. It will be integrated at a Cassegrain focus of the Very Large Telescope (VLT). The image slicer technology is applied to reformat the field of view reducing the spectrograph entrance slit etendue and minimising the spectrograph volume and weight without slit losses. Two image slicers will provide CUBES with two spectral resolving powers: R≥20,000 for high resolution (HR) and R≥5,000 for low resolution (LR). Both image slicers are composed of two arrays of six spherical mirrors. For the HR mode, a rectangular field of view of 1.5arcsec by 10arcsec is reorganised into a slit of 0.19mm × 88mm; for the LR mode, a field of view of 6arcsec by 10arcsec is reformatted into a slit of 0.77mm × 88mm, with slicer mirrors of width 0.5mm and 2mm, respectively. CUBES is currently in the Preliminary Design Phase (Phase B). This communication presents the Conceptual (Phase A) design and the main performance for the HR and LR image slicers addressing the following technological challenges: compact layout with the minimum number of optical components to optimise throughput, near diffraction limited optical quality, telecentric design with overlapped exit pupils for all slices of the field of view, distribution of the slicer mirrors to reduce shadows and selection of the best substrate for the very short wavelengths at which CUBES will operate.

Item Type:Book chapter
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Publisher statement:Copyright (2022) 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:29 September 2022
Date of first online publication:29 August 2022
Date first made open access:29 September 2022

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