Wavefront reconstruction for ELT-sized telescopes with pyramid wavefront sensors

Victoria Hutterer; Iuliia Shatokhina; Andreas Obereder; Ronny Ramlau

doi:10.1117/12.2312423

11 July 2018 Wavefront reconstruction for ELT-sized telescopes with pyramid wavefront sensors

Victoria Hutterer, Iuliia Shatokhina, Andreas Obereder, Ronny Ramlau

Proceedings Volume 10703, Adaptive Optics Systems VI; 1070344 (2018) https://doi.org/10.1117/12.2312423
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

The new generation of ground-based telescopes relies on real-time adaptive optics systems to compensate for atmospheric perturbations arising during the imaging process. Pyramid wavefront sensors are planned to be part of many instruments currently under development for ELT-sized telescopes. The high number of correcting elements to be controlled in real-time and the segmented pupils of the ELTs lead to unprecedented challenges posed to the control algorithms. Based on various (approximate) models, several algorithms were developed in the last decades for linear and non-linear wavefront correction from pyramid sensor data. Among those, we emphasize interaction-matrix-based approaches, Fourier domain methods, iterative algorithms, and algorithms based on the inversion of the Finite Hilbert transform. We briefly present the core ideas of the algorithms and provide the necessary theoretical background like, e.g., the Fourier domain filters, or the direct inversion formulas. We give a detailed comparison of the presented methods with respect to underlying pyramid sensor models, the computational complexities, and reconstruction qualities. The performance of our algorithms is demonstrated in the context of an XAO system on the EPICS instrument and a SCAO system on the METIS instrument on the ELT. In the simulations, realistic features as the ELT spiders and the hexagonal M4 geometry are partially taken into account.

Citation Download Citation

Victoria Hutterer, Iuliia Shatokhina, Andreas Obereder, and Ronny Ramlau "Wavefront reconstruction for ELT-sized telescopes with pyramid wavefront sensors", Proc. SPIE 10703, Adaptive Optics Systems VI, 1070344 (11 July 2018); https://doi.org/10.1117/12.2312423

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available