The optical design of CUBES for the ESO VLT

Lawrence Bissell; Walter Seifert; Ariadna Calcines Rosario; Hans Dekker; Julian Stürmer; Matteo Genoni; Bruno Castilho; Gerardo Avila

doi:10.1117/12.3019166

19 July 2024 The optical design of CUBES for the ESO VLT

Lawrence Bissell, Walter Seifert, Ariadna Calcines Rosario, Hans Dekker, Julian Stürmer, Matteo Genoni, Bruno Castilho, Gerardo Avila

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130966E (2024) https://doi.org/10.1117/12.3019166
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

CUBES (Cassegrain U-Band Efficient Spectrograph) is designed to be the most efficient UV spectrograph on an 8-10m class telescope, exploiting the higher telescope efficiency relative to the ESO ELT in ground-based UV wavelengths. The instrument provides wavelength coverage over a range of 300-405nm, with high instrumental efficiency (>37%) and a resolving power of >20,000 (HR) and >6,000 (LR). It will be mounted on the ESO VLT in Paranal. This paper presents the finalised optical design of the system as the project approaches the final design review. The wavelength range, Cassegrain mounting, high-resolving power, and efficiency requirements introduce some unique design challenges and complexities, detailed in the various optical subsystems including: a UV-optimized atmospheric dispersion corrector; high-line density ruled gratings; a dispersion-compensating spectrographic camera design; and an unusual active flexure compensation system.

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Lawrence Bissell, Walter Seifert, Ariadna Calcines Rosario, Hans Dekker, Julian Stürmer, Matteo Genoni, Bruno Castilho, and Gerardo Avila "The optical design of CUBES for the ESO VLT", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130966E (19 July 2024); https://doi.org/10.1117/12.3019166

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