Preparation of AO-related observations and post-processing recipes for E-ELT HARMONI-SCAO

Noah Schwartz; Jean-François Sauvage; Carlos Correia; Benoît Neichel; Léonardo Blanco; Thierry Fusco; Arlette Pécontal-Rousset; Aurélien Jarno; Laure Piqueras; Kjetil Dohlen; Kacem El Hadi; Niranjan Thatte; Ian Bryson; Fraser Clarke; Hermine Schnetler

doi:10.1117/12.2231291

27 July 2016 Preparation of AO-related observations and post-processing recipes for E-ELT HARMONI-SCAO

Noah Schwartz, Jean-François Sauvage, Carlos Correia, Benoît Neichel, Léonardo Blanco, Thierry Fusco, Arlette Pécontal-Rousset, Aurélien Jarno, Laure Piqueras, Kjetil Dohlen, Kacem El Hadi, Niranjan Thatte, Ian Bryson, Fraser Clarke, Hermine Schnetler

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Proceedings Volume 9909, Adaptive Optics Systems V; 990978 (2016) https://doi.org/10.1117/12.2231291
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

HARMONI is a visible and near-infrared integral field spectrograph designed to be a first-light instrument on the European extremely large telescope. It will use both single-conjugate and laser tomographic adaptive optics to fully exploit high-performance and sky coverage. Using a fast AO modelling toolbox, we simulate anisoplanatism effects on the point spread function of the single-conjugate adaptive optics of HARMONI. We investigate the degradation of the correction performance with respect to the off-axis distance in terms of Strehl ratio and ensquared energy. In addition, we analyse what impact the natural guide source magnitude, AO sampling frequency and number of sub-apertures have on performance.

We show, in addition to the expected PSF degradation with the field direction, that the PSF retains a coherent core even at large off-axis distances. We demonstrated the large performance improvement of fine tuning the sampling frequency for dimer natural guide stars and an improvement of approx. 50% in SR can be reached above the nominal case. We show that using a smaller AO system with only 20x20 sub-apertures it is possible to further increase performance and maintain equivalent performance even for large off-axis angles.

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Noah Schwartz, Jean-François Sauvage, Carlos Correia, Benoît Neichel, Léonardo Blanco, Thierry Fusco, Arlette Pécontal-Rousset, Aurélien Jarno, Laure Piqueras, Kjetil Dohlen, Kacem El Hadi, Niranjan Thatte, Ian Bryson, Fraser Clarke, and Hermine Schnetler "Preparation of AO-related observations and post-processing recipes for E-ELT HARMONI-SCAO", Proc. SPIE 9909, Adaptive Optics Systems V, 990978 (27 July 2016); https://doi.org/10.1117/12.2231291

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KEYWORDS

Adaptive optics

Point spread functions

Stars

Laser optics

Mirrors

Neodymium

Spectrographs

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