Closed loop predictive control of adaptive optics systems with convolutional neural networks

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Swanson, R (Author) Other; Lamb, M (Author) Other; Correia, CM (Author) FEUP; Sivanandam, S (Author) Other; Kutulakos, K (Author) Other

Journal

Title: Monthly Notices of the Royal Astronomical Society

Vol. 503

Pages: 2944-2954

ISSN: 0035-8711

Publisher: Oxford University Press

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 36 Citations

Other information

Authenticus ID: P-00V-09K

DOI: 10.1093/mnras/stab632

Abstract (EN): Predictive wavefront control is an important and rapidly developing field of adaptive optics (AO). Through the prediction of future wavefront effects, the inherent AO system servo-lag caused by the measurement, computation, and application of the wavefront correction can be significantly mitigated. This lag can impact the final delivered science image, including reduced strehl and contrast, and inhibits our ability to reliably use faint guide stars. We summarize here a novel method for training deep neural networks for predictive control based on an adversarial prior. Unlike previous methods in the literature, which have shown results based on previously generated data or for open-loop systems, we demonstrate our network's performance simulated in closed loop. Our models are able to both reduce effects induced by servo-lag and push the faint end of reliable control with natural guide stars, improving K-band Strehl performance compared to classical methods by over 55 per cent for 16th magnitude guide stars on an 8-m telescope. We further show that LSTM based approaches may be better suited in high-contrast scenarios where servo-lag error is most pronounced, while traditional feed forward models are better suited for high noise scenarios. Finally, we discuss future strategies for implementing our system in real-time and on astronomical telescope systems.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11