HARMONI at ELT: characterizing spatial variations in transmission efficiency of volume phase holographic diffraction gratings

David Gooding; Niranjan Thatte; Edgar Castillo Dominguez; Eduard Muslimov; Matthias Tecza; R. Elliot Meyer; Fraser Clarke; Zeynep Ozer; Vanessa Ferraro-Wood; James Kariuki; Kieran McCall; Liam Boland; Elroy Pearson; David Creasey; Andrew Clawson

doi:10.1117/12.3020189

26 August 2024 HARMONI at ELT: characterizing spatial variations in transmission efficiency of volume phase holographic diffraction gratings

David Gooding, Niranjan Thatte, Edgar Castillo Dominguez, Eduard Muslimov, Matthias Tecza, R. Elliot Meyer, Fraser Clarke, Zeynep Ozer, Vanessa Ferraro-Wood, James Kariuki, Kieran McCall, Liam Boland, Elroy Pearson, David Creasey, Andrew Clawson

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 131001T (2024) https://doi.org/10.1117/12.3020189
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

HARMONI is the first light visible and near-IR integral field spectrograph for the ELT. It covers a large spectral range from 470nm to 2450nm with resolving powers from 3500 to 18000 and spatial sampling from 60mas to 4mas. It can operate in two Adaptive Optics modes - SCAO (including a High Contrast capability) and LTAO - or with NOAO. The project is preparing for Final Design Reviews. The diffraction gratings are the single biggest contributor to the instrument’s throughput loss. Additionally, the range of operating modes and configurations available to HARMONI users will result in a varying beam footprint at the grating surface. HARMONI’s four spectrographs will be equipped with 10 gratings each, requiring a bespoke automated test facility to qualify the transmission performance of all the HARMONI gratings. This paper describes the test bench, and presents transmission efficiency results for different HARMONI gratings.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

David Gooding, Niranjan Thatte, Edgar Castillo Dominguez, Eduard Muslimov, Matthias Tecza, R. Elliot Meyer, Fraser Clarke, Zeynep Ozer, Vanessa Ferraro-Wood, James Kariuki, Kieran McCall, Liam Boland, Elroy Pearson, David Creasey, and Andrew Clawson "HARMONI at ELT: characterizing spatial variations in transmission efficiency of volume phase holographic diffraction gratings", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 131001T (26 August 2024); https://doi.org/10.1117/12.3020189

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