HARMONI at ELT: laboratory results of novel method for combining multiple light sources for AO calibrations

Noah Schwartz; Kjetil Dohlen; Kacem El Hadi; Edgard Renault; William Ceria; Jean-François Sauvage; Deborah Malone

doi:10.1117/12.3019905

27 August 2024 HARMONI at ELT: laboratory results of novel method for combining multiple light sources for AO calibrations

Noah Schwartz, Kjetil Dohlen, Kacem El Hadi, Edgard Renault, William Ceria, Jean-François Sauvage, Deborah Malone

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 130975X (2024) https://doi.org/10.1117/12.3019905
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

In this paper, we present the design of the HARMONI Adaptive Optics Calibration Unit (AOCU). The AOCU features on-axis sources covering 0.6 to1.8 μm with controllable wavefront shapes and supports natural guide-star wavefront sensors for SCAO, HCAO, and LTAO. It is crucial for calibrating wavefront sensors, internal interaction matrices, non-common path aberrations (NCPAs), and the pointing model zero position. The illumination assembly includes four diffraction-limited sources and a resolved source, using an endlessly single-mode fibre and a multimode fibre to couple several LED sources efficiently. We focus on the light-injection module, presenting photometric budgets. Despite significant attenuations (10^-6 to 10^-10), the scheme delivers the required beam quality in flux and geometry. This design's performance and flexibility make it suitable for the AOCU and replicable for other internal light sources of HARMONI.

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

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Noah Schwartz, Kjetil Dohlen, Kacem El Hadi, Edgard Renault, William Ceria, Jean-François Sauvage, and Deborah Malone "HARMONI at ELT: laboratory results of novel method for combining multiple light sources for AO calibrations", Proc. SPIE 13097, Adaptive Optics Systems IX, 130975X (27 August 2024); https://doi.org/10.1117/12.3019905

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