8 August 2016 Real-time alignment and co-phasing of multi-aperture systems using phase diversity
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The alignment of the subapertures is a major challenge for future segmented telescopes and telescope arrays. We show here that a phase diversity sensor using two near-focus images can fully and efficiently align a multiple aperture system, both for the alignment (large amplitude tip/tilt aberrations correction) and phasing (piston and small amplitude tip/tilt aberrations correction) modes. We derive a new algorithm for the alignment of the subapertures : ELASTIC. We quantify the novel algorithm performance by numerical simulations and we demonstrate it experimentally on a test bench. We also study the performance of LAPD, a recent real-time algorithm for the phasing of the sub-apertures. This work should simplify the design of future multiple aperture systems.
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S. Vievard, S. Vievard, F. Cassaing, F. Cassaing, A. Bonnefois, A. Bonnefois, L. M. Mugnier, L. M. Mugnier, J. Montri, J. Montri, "Real-time alignment and co-phasing of multi-aperture systems using phase diversity", Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99062Q (8 August 2016); doi: 10.1117/12.2230679; https://doi.org/10.1117/12.2230679

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