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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 3 CONTRIBUTI IN ATTI DI CONVEGNO (Proceedings)
  4. 3.01 Contributi in Atti di convegno
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29314
Title: VPHGs for WEAVE: design, manufacturing and characterization
Authors: BIANCO, ANDREA 
PARIANI, Giorgio 
Aliverti, Matteo 
ZANUTTA, Alessio 
Arns, James
Pragt, Johan
Stuik, Remko
Middleton, Kevin
Tosh, Ian
Dalton, Gavin
Trager, Scott
Abrams, Don Carlos
Lopez Aguerri, Jose Alfonso
BONIFACIO, PIERCARLO
VALLENARI, Antonella 
Carrasco, Esperanza
Issue Date: 2018
Volume: Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
Editors: Navarro, Ramón ; Geyl, Roland
Series: PROCEEDINGS OF SPIE 
Number: 10706
First Page: 107064X-1
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.
Conference Name: Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Conference Place: Austin, Texas, United States
Conference Date: 10-15 June, 2018
URI: http://hdl.handle.net/20.500.12386/29314
URL: https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10706/2311693/VPHGs-for-WEAVE-design-manufacturing-and-characterization/10.1117/12.2311693.short?SSO=1
ISSN: 0277-786X
ISBN: 978-1-5106-1966-1
DOI: 10.1117/12.2311693
Bibcode ADS: 2018SPIE10706E..4XB
Fulltext: open
Appears in Collections:3.01 Contributi in Atti di convegno

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