scholarly journals Deep residual learning for low-order wavefront sensing in high-contrast imaging systems

2020 ◽  
Vol 28 (18) ◽  
pp. 26267
Author(s):  
Gregory Allan ◽  
Iksung Kang ◽  
Ewan S. Douglas ◽  
George Barbastathis ◽  
Kerri Cahoy
Keyword(s):  
Imaging Systems ◽  
Wavefront Sensing ◽  
High Contrast ◽  
Contrast Imaging ◽  
Residual Learning ◽  
High Contrast Imaging ◽  
Low Order

scholarly journals Closed loop, DM diversity-based, wavefront correction algorithm for high contrast imaging systems

2007 ◽  
Vol 15 (19) ◽  
pp. 12338 ◽  
Author(s):  
Amir Give'on ◽  
Ruslan Belikov ◽  
Stuart Shaklan ◽  
Jeremy Kasdin
Keyword(s):  
Closed Loop ◽  
Imaging Systems ◽  
High Contrast ◽  
Correction Algorithm ◽  
Contrast Imaging ◽  
Wavefront Correction ◽  
High Contrast Imaging

scholarly journals A New Standard for Assessing the Performance of High Contrast Imaging Systems

2017 ◽  
Vol 155 (1) ◽  
pp. 19 ◽  
Author(s):  
Rebecca Jensen-Clem ◽  
Dimitri Mawet ◽  
Carlos A. Gomez Gonzalez ◽  
Olivier Absil ◽  
Ruslan Belikov ◽  
...  
Keyword(s):  
Imaging Systems ◽  
High Contrast ◽  
Contrast Imaging ◽  
High Contrast Imaging

scholarly journals High-order myopic coronagraphic phase diversity (COFFEE) for wave-front control in high-contrast imaging systems

2013 ◽  
Vol 21 (26) ◽  
pp. 31751 ◽  
Author(s):  
B. Paul ◽  
L. M. Mugnier ◽  
J.-F. Sauvage ◽  
M. Ferrari ◽  
K. Dohlen
Keyword(s):  
Wave Front ◽  
High Order ◽  
Imaging Systems ◽  
High Contrast ◽  
Contrast Imaging ◽  
High Contrast Imaging ◽  
Phase Diversity

Broadband wavefront correction algorithm for high-contrast imaging systems

2007 ◽  
Author(s):  
Amir Give'on ◽  
Brian Kern ◽  
Stuart Shaklan ◽  
Dwight C. Moody ◽  
Laurent Pueyo
Keyword(s):  
Imaging Systems ◽  
High Contrast ◽  
Correction Algorithm ◽  
Contrast Imaging ◽  
Wavefront Correction ◽  
High Contrast Imaging

scholarly journals End-to-end simulation of high-contrast imaging systems: methods and results for the PICTURE mission family

2015 ◽  
Author(s):  
Ewan S. Douglas ◽  
Kuravi Hewawasam ◽  
Christopher B. Mendillo ◽  
Kerri L. Cahoy ◽  
Timothy A. Cook ◽  
...  
Keyword(s):  
Imaging Systems ◽  
High Contrast ◽  
Contrast Imaging ◽  
High Contrast Imaging ◽  
End To End

scholarly journals Experimental validation of coronagraphic focal-plane wavefront sensing for future segmented space telescopes

2020 ◽  
Vol 639 ◽  
pp. A70
Author(s):  
Lucie Leboulleux ◽  
Jean-François Sauvage ◽  
Rémi Soummer ◽  
Thierry Fusco ◽  
Laurent Pueyo ◽  
...  
Keyword(s):  
Focal Plane ◽  
Wavefront Sensing ◽  
High Contrast ◽  
Space Telescopes ◽  
Contrast Imaging ◽  
Primary Mirror ◽  
Hardware System ◽  
High Contrast Imaging ◽  
Earth Like Planets ◽  
Plane Wavefront

Context. Direct imaging of Earth-like planets from space requires dedicated observatories, combining large segmented apertures with instruments and techniques such as coronagraphs, wavefront sensors, and wavefront control in order to reach the high contrast of 1010 that is required. The complexity of these systems would be increased by the segmentation of the primary mirror, which allows for the larger diameters necessary to image Earth-like planets but also introduces specific patterns in the image due to the pupil shape and segmentation and making high-contrast imaging more challenging. Among these defects, the phasing errors of the primary mirror are a strong limitation to the performance. Aims. In this paper, we focus on the wavefront sensing of segment phasing errors for a high-contrast system, using the COronagraphic Focal plane wave-Front Estimation for Exoplanet detection (COFFEE) technique. Methods. We implemented and tested COFFEE on the High-contrast imaging for Complex Aperture Telescopes (HiCAT) testbed, in a configuration without any coronagraph and with a classical Lyot coronagraph, to reconstruct errors applied on a 37 segment mirror. We analysed the quality and limitations of the reconstructions. Results. We demonstrate that COFFEE is able to estimate correctly the phasing errors of a segmented telescope for piston, tip, and tilt aberrations of typically 100 nm RMS. We also identified the limitations of COFFEE for the reconstruction of low-order wavefront modes, which are highly filtered by the coronagraph. This is illustrated using two focal plane mask sizes on HiCAT. We discuss possible solutions, both in the hardware system and in the COFFEE optimizer, to mitigate these issues.

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