Near-infrared focal plane wavefront sensing techniques

Rafael M. Salgueiro; Carlos Correia; Nuno Morujão; Arseniy Kuznetsov; Benoît Neichel; Paulo Garcia

doi:10.1117/12.3018984

28 August 2024 Near-infrared focal plane wavefront sensing techniques

Rafael M. Salgueiro, Carlos Correia, Nuno Morujão, Arseniy Kuznetsov, Benoît Neichel, Paulo Garcia

Proceedings Volume 13097, Adaptive Optics Systems IX; 130973O (2024) https://doi.org/10.1117/12.3018984
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Laser guide star (LGS) wavefront sensing (WFS) is insensitive to tip/tilt, and the variability of the sodium layer altitude in the atmosphere compromises focus measurements. Consequently, sensing of tip/tilt and focus needs to be done separately by means of faint natural guide stars (NGS). In this article, we study and compare three different single-image-phase-diversity (SIPD) algorithms for this specific application, namely Gerchberg-Saxton (GS), Linearized Focal Plane Technique (LiFT), and Fast&Furious (F&F) using high-fidelity Monte Carlo simulations. We present a complete study regarding the performance of GS, LiFT, and F&F under realistic conditions of flux, SNR, and sampling. In addition, we also used these algorithms to measure non-common path aberrations (NCPA), pupil fragmentation modes, and primary mirror phasing errors.

Citation Download Citation

Rafael M. Salgueiro, Carlos Correia, Nuno Morujão, Arseniy Kuznetsov, Benoît Neichel, and Paulo Garcia "Near-infrared focal plane wavefront sensing techniques", Proc. SPIE 13097, Adaptive Optics Systems IX, 130973O (28 August 2024); https://doi.org/10.1117/12.3018984

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