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Final characteristics and performances of the fibres of MOONS

I. Guinouard, J.-P. Amans, D. Lee, A. Cabral, P. Rees, S. Watson, W. Taylor, H. Flores

Abstract
The Multi-Object Optical and near-Infrared Spectrograph (MOONS) will exploit the full 500 square arcmin field of view offered by the Nasmyth focus of the Very Large Telescope and will be equipped with two identical triple arm cryogenic spectrographs covering the wavelength range 0.64μm-1.8μm, with a multiplex capability of over 1000 fibres. Each spectrograph will produce spectra for 500 targets simultaneously, each with its own dedicated sky fibre for optimal sky subtraction. The system will have both a medium resolution (R~4000-6000) mode and a high resolution (R~20000) mode. The fibres are used to pick off each sub field of 1” and are used to transport the light from the instrument focal plane to the two spectrographs. Each fibre has a microlens to focus the beam into the fibre at a relative fast focal ratio of F/3.65 to reduce the Focal Ratio Degradation (FRD). This paper describes the final characteristics and performances of the MOONS fibre link, and their installation status into the slit of the spectrograph during the integration phase in Europe.

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV

Proceedings of the SPIE
Volume 11451, Number 1145, Page 12
2020 December

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia