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

Basden, A.G. and Jenkins, D. and Morris, T.J. and Osborn, J. and Townson, M.J. (2019) 'Efficient implementation of pseudo open loop control for adaptive optics on Extremely Large Telescopes.', Monthly notices of the Royal Astronomical Society., 486 (2). pp. 1774-1780.


Closed-loop adaptive optics systems which use minimum mean square error wavefront reconstruction require the computation of pseudo open loop wavefront slopes. These techniques incorporate a knowledge of atmospheric statistics which 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.

Item Type:Article
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Publisher statement:Published by Oxford University Press on behalf of The Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
Date accepted:27 March 2019
Date deposited:04 April 2019
Date of first online publication:29 March 2019
Date first made open access:No date available

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