HARMONI - first light spectroscopy for the ELT: spectrograph camera lens mounts

Andrea Hidalgo; James Kariuki; James Lynn; Wui Cheng; Adam Lowe; Fehim Taha Bagci; Fraser Clarke; Ian Lewis; Ian Tosh; Hermine Schnetler; John Capone; Matthias Tecza; Michael Booth; Myriam Rodrigues; Nicholas Cann; Niranjan Thatte; Zeynep Ozer; Tom Foster

doi:10.1117/12.2560334

14 December 2020 HARMONI - first light spectroscopy for the ELT: spectrograph camera lens mounts

Andrea Hidalgo, James Kariuki, James Lynn, Wui Cheng, Adam Lowe, Fehim Taha Bagci, Fraser Clarke, Ian Lewis, Ian Tosh, Hermine Schnetler, John Capone, Matthias Tecza, Michael Booth, Myriam Rodrigues, Nicholas Cann, Niranjan Thatte, Zeynep Ozer, Tom Foster

Author Affiliations +

Proceedings Volume 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV; 1145139 (2020) https://doi.org/10.1117/12.2560334
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

HARMONI is the first light visible and near-infrared (NIR) integral field spectrograph for the Extremely Large Telescope(ELT). The HARMONI spectrograph will have four near-infrared cameras and two visible, both with seven lenses of various materials and diameters ranging from 286 to 152 mm. The lens mounts design has been optimized for each lens material to compensate for thermal stresses and maintain lens alignment at the operational temperature of 130 K. We discuss their design and mounting concept, as well as assembly and verification steps. We show initial results from two prototypes and outline improvements in the mounting procedures to reach tighter lens alignments. To conclude, we present a description of our future work to measure the decentering of the lenses when cooled down and settled.

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Andrea Hidalgo, James Kariuki, James Lynn, Wui Cheng, Adam Lowe, Fehim Taha Bagci, Fraser Clarke, Ian Lewis, Ian Tosh, Hermine Schnetler, John Capone, Matthias Tecza, Michael Booth, Myriam Rodrigues, Nicholas Cann, Niranjan Thatte, Zeynep Ozer, and Tom Foster "HARMONI - first light spectroscopy for the ELT: spectrograph camera lens mounts", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 1145139 (14 December 2020); https://doi.org/10.1117/12.2560334

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