Metrology measurements for large aperture VPH gratings

Jessica R. Zheng, Luke Gers, Jeroen Heijmans

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

7 Citations (Scopus)

Abstract

The High Efficiency and Resolution Multi Element Spectrograph (HERMES) for the Australian Astronomical Observatory (AAO) uses four large aperture, high angle of incidence volume phase holographic gratings (VPHG) for high resolution 'Galactic archaeology' spectroscopy. The large clear aperture, the high diffraction efficiency, the line frequency homogeneity, and mosaic alignment made manufacturing and testing challenging. We developed new metrology systems at the AAO to verify the performance of these VPH gratings. The measured diffraction efficiencies and line frequency of the VPH gratings received so far meet the vendor's provided data. The wavefront quality for the Blue VPH grating is good but the Green and Red VPH gratings need to be post polishing.

Original languageEnglish
Title of host publicationOptical Manufacturing and Testing X
EditorsOliver W. Fähnle, Ray Williamson, Dae Wook Kim
Place of PublicationBellingham, Washington
PublisherSPIE
Pages88380G-1-88380G-11
Number of pages11
ISBN (Print)9780819496881
DOIs
Publication statusPublished - 7 Sep 2013
Externally publishedYes
EventOptical Manufacturing and Testing X - San Diego, CA, United States
Duration: 26 Aug 201327 Aug 2013

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume8838
ISSN (Print)0277-786x

Conference

ConferenceOptical Manufacturing and Testing X
CountryUnited States
CitySan Diego, CA
Period26/08/1327/08/13

Keywords

  • Astronomical spectrograph
  • Diffraction efficiency
  • Metrology
  • Mosaic
  • VPH grating
  • Wavefront

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