Development of the fibres of MOONS

Isabelle Guinouard; David Lee; Hermine Schnetler; William Taylor; Jean-Philippe Amans; David Montgomery; Ernesto Oliva

doi:10.1117/12.2054735

18 July 2014 Development of the fibres of MOONS

Isabelle Guinouard, David Lee, Hermine Schnetler, William Taylor, Jean-Philippe Amans, David Montgomery, Ernesto Oliva

Proceedings Volume 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation; 91514S (2014) https://doi.org/10.1117/12.2054735
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

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 0.8 - 1.8 μm, with a multiplex capability of approximately 1000 fibres. Each triple arm spectrograph will produce spectra for half of the targets simultaneously. 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 1.05 arcseconds 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 presents the overall design of the fibre system and describes the specific developments required to optimise its performance. The design of the fibre input optics, the choice of the fibre connector, and the layout of the slit end are described. The results of preliminary tests to measure the effect of twisting on the FRD performance of prototype fibres are also discussed.

Citation Download Citation

Isabelle Guinouard, David Lee, Hermine Schnetler, William Taylor, Jean-Philippe Amans, David Montgomery, and Ernesto Oliva "Development of the fibres of MOONS", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91514S (18 July 2014); https://doi.org/10.1117/12.2054735

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