HARMONI at ELT: chromatic dependence of wavefront error performance in volume phase holographic diffraction gratings

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

doi:10.1117/12.3019252

26 August 2024 HARMONI at ELT: chromatic dependence of wavefront error performance in volume phase holographic diffraction gratings

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

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Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 131005K (2024) https://doi.org/10.1117/12.3019252
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

HARMONI is the first light, adaptive optics assisted, visible and near-infrared integral field spectrograph for the European Southern Observatory’s Extremely Large Telescope (ELT). As a ‘work-horse’ instrument, HARMONI will offer low, medium, and high spectral resolution volume phase diffraction gratings (VPH) across the I, z, J, H, and K-bands, operating at four spatial sampling scales including at the diffraction limit of the ELT. Consequently, understanding and controlling sources of wavefront error (WFE) is of critical importance to the instrument performance. We present a comprehensive overview of the WFE performance verification for the VPH element of the HARMONI infrared grating module. In collaboration with Wasatch Photonics, we compare the measured WFE at different test wavelengths to investigate the presence of any chromatic dependence or lack thereof. Finally, we discuss the origin of the observed wavefront error and the effectiveness of mitigation techniques such as magnetorheological finishing.

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R. Elliot Meyer, David Gooding, Matthias Tecza, Edgar Castillo Dominguez, Eduard Muslimov, Sophie Paszynska, James Kariuki, Zeynep Ozer, Niranjan Thatte, Liam Boland, Fraser Clarke, Andrew Clawson, David Creasey, Vanessa Ferraro-Wood, Ian Lewis, Kieran McCall, Cicely Rathmell, and Elroy Pearson "HARMONI at ELT: chromatic dependence of wavefront error performance in volume phase holographic diffraction gratings", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 131005K (26 August 2024); https://doi.org/10.1117/12.3019252

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KEYWORDS

Optical gratings

Diffraction gratings

Magnetorheological finishing

Prototyping

Wavefronts

Monochromatic aberrations

Colorimetry

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