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13 December 2020 Maximum likelihood co-phasing of segmented mirrors with a pyramid in the visible: simulation vs. experiment
Ronald Holzlöhner, Pierre Janin-Potiron, Benoit Neichel, Aglaé Kellerer, Samuel Lévêque, Vincent Chambouleyron, Thierry Fusco, Victoria F. Wallauer
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Proceedings Volume 11448, Adaptive Optics Systems VII; 114480S (2020) https://doi.org/10.1117/12.2563287
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only
Abstract
We demonstrate numerically the phasing of a telescope with a primary segmented mirror consisting of 800 hexagonal segments using a pyramid wavefront sensor, supported by experiments. The segments are initially misaligned in piston/tip/tilt with median inter-segment steps of several micrometers. We simulate a mirror with some missing segments and a telescope spider with large optical phase discontinuities across its six vanes. The physical optics simulation is validated by experiments on the LOOPS optical bench at LAM. The correct combination of step solutions is selected by maximum likelihood methods. We emulate different star magnitudes and seeing conditions.
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Ronald Holzlöhner, Pierre Janin-Potiron, Benoit Neichel, Aglaé Kellerer, Samuel Lévêque, Vincent Chambouleyron, Thierry Fusco, and Victoria F. Wallauer "Maximum likelihood co-phasing of segmented mirrors with a pyramid in the visible: simulation vs. experiment", Proc. SPIE 11448, Adaptive Optics Systems VII, 114480S (13 December 2020); https://doi.org/10.1117/12.2563287
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KEYWORDS
Device simulation
Segmented mirrors
Mirrors
Telescopes
Atmospheric modeling
Modulation
Optical benches
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