Active correction of aperture discontinuities (ACAD) for space telescope pupils: a parametic analysis

Abstract

As the performance of coronagraphs improves, the achievable contrast is more and more dependent of the shape of the pupil. The future generation of space and ground based coronagraphic instruments will have to achieve high contrast levels on on-axis and/or segmented telescopes. To correct for the high amplitude aberrations introduced by secondary mirror structures and segmentation of the primary mirror, we explore a two deformable mirror (DM) method. The major difficulty of several DM methods is the non-linear relation linking actuator strokes to the point spread function in the coronagraph focal plane. The Active Compensation of Aperture Discontinuities (ACAD) method is achieving this minimization by solving a non linear differential Monge Ampere equation. Once this open loop method have reached the minimum, a close-loop stroke minimization method can be applied to correct for phase and amplitude aberrations to achieve the ultimate contrast. In this paper, I describe the results of the parametric analysis that that I have undertaken on this method. After recalling the principle of the method, I will described the explored parameter space (deformable mirror set-up, shape of the pupil, bandwidth, coronagraph designs). I will precisely described the way I simulated the Vortex coronagraph for this numerical simulation. Finally I will present the preliminary results of this parametric analysis for space telescope pupils only.

arXiv commentProceedings of the SPIE, Volume 9605, id. 96050M 13 pp. (2015)

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Cited by in corpus (8)

• Active correction of aperture discontinuities - optimized stroke minimization II: optimization for future missions
• Polynomial Apodizers for Centrally Obscured Vortex Coronagraphs
• Active correction of aperture discontinuities - optimized stroke minimization I: a new adaptive interaction matrix algorithm
• Active compensation of aperture discontinuities for WFIRST-AFTA: analytical and numerical comparison of propagation methods and preliminary results with a WFIRST-AFTA-like pupil
• High-contrast Demonstration of an Apodized Vortex Coronagraph
• Fundamental limits to high-contrast wavefront control
• Capabilities of ACAD-OSM, an active method for the correction of aperture discontinuities
• Correcting for the effects of pupil discontinuities with the ACAD method