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VPHGs for WEAVE: design, manufacturing and characterization
Author(s): Andrea Bianco; Giorgio Pariani; Matteo Aliverti; Alessio Zanutta; James Arns; Johan Pragt; Remko Stuik; Kevin Middleton; Ian Tosh; Gavin Dalton; Scott Trager; Don Carlos Abrams; Jose Alfonso Lopez Aguerri; Piercarlo Bonifacio; Antonella Vallenari; Esperanza Carrasco
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Paper Abstract

WEAVE is the next-generation optical spectroscopy facility for the William Herschel Telescope (WHT). It shows two channels (blue and red) and two working modes, a low-resolution (R=3,000-7,500) and a high-resolution (R=13,000- 25,000). The dispersing elements of the spectrograph are Volume Phase Holographic Gratings (VPHGs), two for the lower resolution mode and three for the higher resolution mode. Such gratings have a large size (clear aperture > 190 mm) and they are characterized by some key features, i.e. diffraction efficiency, wavefront error and dispersion that affect the final performances of the spectrograph. The VPHGs have been produced by KOSI based on the WEAVE design. After that, the VPHGs have been characterized, showing interesting results in terms of diffraction efficiency that reached peak values of 90%. As for the wavefront distortion, which is one of the critical aspect in VPHG technology, a different behavior between medium and high resolution elements was found. A larger wavefront distortion have been measured in the high resolution elements, because of the higher aspect ratio. A polishing process on the assembled VPHGs has been performed in order to reduce the wavefront distortion. Here, the results are presented and the specific issues discussed.

Paper Details

Date Published: 10 July 2018
PDF: 14 pages
Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107064X (10 July 2018); doi: 10.1117/12.2311693
Show Author Affiliations
Andrea Bianco, Osservatorio Astronomico di Brera (Italy)
Giorgio Pariani, Osservatorio Astronomico di Brera (Italy)
Matteo Aliverti, Osservatorio Astronomico di Brera (Italy)
Alessio Zanutta, Osservatorio Astronomico di Brera (Italy)
James Arns, Kaiser Optical Systems, Inc. (United States)
Johan Pragt, ASTRON (Netherlands)
Leiden Univ. (Netherlands)
Leiden Observatory (Netherlands)
Remko Stuik, Leiden Observatory, Leiden Univ. (Netherlands)
STFC Rutherford Appleton Lab. (United Kingdom)
Kevin Middleton, STFC Rutherford Appleton Lab. (United Kingdom)
Ian Tosh, STFC Rutherford Appleton Lab. (United Kingdom)
Gavin Dalton, STFC Rutherford Appleton Lab. (United Kingdom)
Univ. of Oxford (United Kingdom)
Scott Trager, Rijksuniv. Groningen (Netherlands)
Don Carlos Abrams, Isaac Newton Group of Telescopes (Spain)
Jose Alfonso Lopez Aguerri, Instituto de Astrofísica de Canarias (Spain)
Piercarlo Bonifacio, GEPI, Observatoire de Paris (France)
Antonella Vallenari, Osservatorio Astronomico di Padova, INAF (Italy)
Esperanza Carrasco, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)

Published in SPIE Proceedings Vol. 10706:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
Ramón Navarro; Roland Geyl, Editor(s)

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