Assemblies of the microlenses on the front-end fibres of MOONS

Isabelle Guinouard; David Horville; David Lee; Stephen Watson; Phil Rees; Hector Flores

doi:10.1117/12.2560639

13 December 2020 Assemblies of the microlenses on the front-end fibres of MOONS

Isabelle Guinouard, David Horville, David Lee, Stephen Watson, Phil Rees, Hector Flores

Proceedings Volume 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV; 114516I (2020) https://doi.org/10.1117/12.2560639
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

MOONS (Multi-Object Optical and near-Infrared Spectrograph) will be a fibre-fed, optical to near-infrared multi-objet spectrograph designed to utilise the full 25 arcminute diameter field-of-view of the Very Large Telescope and with a multiplex capability of over 1000 fibres. The baseline design includes a single focal plate and fibre positioning subsystem, consisting of up 1024 small dual radial arm modules, which are used to place each fibre, in the exact x, y and z position in the telescope focal plane. Each fibre has a microlens to focus the beam into the fibre at a relatively fast focal ratio of F/3.65 to reduce the Focal Ratio Degradation (FRD). The light is then fed through the fibres to two identical, cryogenic triple arm spectrographs, mounted on the instrument platform. In each spectrograph, the light from 512 fibres, arranged in a pseudo-slit, is split by dichroic filters into three channels (RI, YJ and H) and dispersed on to 4k x 4k detectors in each channel.

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Isabelle Guinouard, David Horville, David Lee, Stephen Watson, Phil Rees, and Hector Flores "Assemblies of the microlenses on the front-end fibres of MOONS", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 114516I (13 December 2020); https://doi.org/10.1117/12.2560639

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