Work

Efficient implementation of pseudo open-loop control for adaptive optics on Extremely Large Telescopes

Year: 2019

Type: article

Abstract: Closed-loop adaptive optics systems that use minimum mean square error wavefront reconstruction require the computation of pseudo open-loop wavefront slopes. These techniques incorporate a knowledge of atmospheric statistics that must therefore be represented within the wavefront slope measurements. These pseudo open-loop slopes are computed from the sum of the measured residual slopes and the reconstructed slopes that would be given if the deformable mirror was flat, generally involving the multiplication of an interaction matrix with actuator demands from the previous time-step. When using dense algebra, this multiplication is computationally expensive for Extremely Large Telescopes, requiring a large memory bandwidth. Here, we show that this requirement can be significantly reduced, maintaining mathematical correctness and significantly reducing system complexity. This therefore reduces the cost of these systems and increases robustness and reliability.N

Source: Monthly Notices of the Royal Astronomical Society

DOI: 10.1093/mnras/stz918

Authors: A G Basden, D Jenkins, T J Morris, J Osborn, M J Townson

Institution: Durham University

Language: English

Topic: Adaptive optics and wavefront sensing

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,046

Funders: European Commission, Horizon 2020 Framework Programme, Science and Technology Facilities Council