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Proceedings Paper

A large mosaic echelle grating for ESPRESSO spectrograph
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Paper Abstract

ESPRESSO, The Echelle SPectrograph for Rocky Exoplanet and Stable Spectroscopic Observations, is a super-stable Optical, fiber feed High Resolution Spectrograph for the combined coudé focus of the VLT. The instrument has been successfully commissioned end of 2017.

Several optical ‘tricks’ have been used to obtain high spectral resolution and efficiency despite the large size of the telescope and the 1 arcscec sky aperture of the instrument, like superimposing the beams in order to minimize the size of the echelle grating.

The 220000 spectral resolution specified for the spectrograph requires a 3 x 1 echelle mosaic, since the largest echelle master that can be ruled has a ruled length of 408 mm (16 inch) and a width of up to 306 mm (12 inch).

The paper describes the design of the mosaic as well as the various phases of its assembly and alignment. We also introduce the mounting of the mosaic inside the mount in order to guaranty the long term stability ESPRESSO requires. We address the packing and conditioning of the mosaic for the transport to Chile, which has been proven to sustain extremely strong shock, without causing misalignment in the mosaic. Finally a short summary of the instrument performances is presented.

Paper Details

Date Published: 9 July 2018
PDF: 10 pages
Proc. SPIE 10701, Optical and Infrared Interferometry and Imaging VI, 107012P (9 July 2018); doi: 10.1117/12.2312435
Show Author Affiliations
Jean Louis Lizon, European Southern Observatory (Germany)
Hans Dekker, European Southern Observatory (Germany)
Antonio Manescau, European Southern Observatory (Germany)
Denis Megevan, Observatoire de Genève (Switzerland)
Francesco Alfonso Pepe, Observatoire de Genève (Switzerland)
Marco Riva, INAF - Osservatorio Astronomico di Brera (Italy)

Published in SPIE Proceedings Vol. 10701:
Optical and Infrared Interferometry and Imaging VI
Michelle J. Creech-Eakman; Peter G. Tuthill; Antoine Mérand, Editor(s)

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