On-sky results of focal-plane wavefront sensing and control with the asymmetric pupil vector-apodizing phase plate coronagraph

2020 ◽  
Author(s):  
Steven P. Bos ◽  
Kelsey L. Miller ◽  
Julien Lozi ◽  
Olivier Guyon ◽  
Vikram Mark Radhakrishnan ◽  
...  
Keyword(s):  
Focal Plane ◽  
Phase Plate ◽  
Wavefront Sensing ◽  
Plane Wavefront ◽  
And Control

scholarly journals Focal-plane wavefront sensing with the vector-Apodizing Phase Plate

2019 ◽  
Vol 632 ◽  
pp. A48 ◽  
Author(s):  
S. P. Bos ◽  
D. S. Doelman ◽  
J. Lozi ◽  
O. Guyon ◽  
C. U. Keller ◽  
...  
Keyword(s):  
Focal Plane ◽  
Closed Loop ◽  
Phase Plate ◽  
Wavefront Sensing ◽  
Internal Source ◽  
Maximum Throughput ◽  
Loop Correction ◽  
Common Path ◽  
Plane Wavefront ◽  
Zernike Modes

Context. One of the key limitations of the direct imaging of exoplanets at small angular separations are quasi-static speckles that originate from evolving non-common path aberrations (NCPA) in the optical train downstream of the instrument’s main wavefront sensor split-off. Aims. In this article we show that the vector-Apodizing Phase Plate (vAPP) coronagraph can be designed such that the coronagraphic point spread functions (PSFs) can act as wavefront sensors to measure and correct the (quasi-)static aberrations without dedicated wavefront sensing holograms or modulation by the deformable mirror. The absolute wavefront retrieval is performed with a non-linear algorithm. Methods. The focal-plane wavefront sensing (FPWFS) performance of the vAPP and the algorithm are evaluated via numerical simulations to test various photon and read noise levels, the sensitivity to the 100 lowest Zernike modes, and the maximum wavefront error (WFE) that can be accurately estimated in one iteration. We apply these methods to the vAPP within SCExAO, first with the internal source and subsequently on-sky. Results. In idealized simulations we show that for 107 photons the root mean square (rms) WFE can be reduced to ∼λ/1000, which is 1 nm rms in the context of the SCExAO system. We find that the maximum WFE that can be corrected in one iteration is ∼λ/8 rms or ∼200 nm rms (SCExAO). Furthermore, we demonstrate the SCExAO vAPP capabilities by measuring and controlling the 30 lowest Zernike modes with the internal source and on-sky. On-sky, we report a raw contrast improvement of a factor ∼2 between 2 and 4 λ/D after five iterations of closed-loop correction. When artificially introducing 150 nm rms WFE, the algorithm corrects it within five iterations of closed-loop operation. Conclusions. FPWFS with the vAPP coronagraphic PSFs is a powerful technique since it integrates coronagraphy and wavefront sensing, eliminating the need for additional probes and thus resulting in a 100% science duty cycle and maximum throughput for the target.

scholarly journals Focal plane wavefront sensing and control for ground-based imaging

2012 ◽  
Author(s):  
Dmitry Savransky ◽  
Bruce A. Macintosh ◽  
Sandrine J. Thomas ◽  
Lisa A. Poyneer ◽  
David W. Palmer ◽  
...  
Keyword(s):  
Focal Plane ◽  
Wavefront Sensing ◽  
Plane Wavefront ◽  
And Control

scholarly journals Successes and challenges of the APP Coronagraph

2013 ◽  
Vol 8 (S299) ◽  
pp. 40-41
Author(s):  
Matthew A. Kenworthy ◽  
Sascha Quanz ◽  
Gilles Otten ◽  
Tiffany Meshkat ◽  
Johanan Codona ◽  
...  
Keyword(s):  
Focal Plane ◽  
Phase Plate ◽  
Wavefront Sensing ◽  
Common Path ◽  
Pointing Errors ◽  
Camera Systems ◽  
Plane Wavefront ◽  
Successes And Challenges

AbstractThe Apodizing Phase Plate (APP) coronagraph has been used to image the exoplanet β Pictoris b and the protoplanet candidate around HD 100546, and is currently in use in surveys with NaCo at the VLT. Its success is due to its tolerance to tip-tilt pointing errors in current AO systems, which degrade the performance of nearly all other coronagraphs. Currently the sensitivity of the APP is limited by non-common path errors in the science camera systems and by its chromatic behaviour. We present the achromatized Vector APP coronagraph and address how we will measure and minimise non-common path errors with Focal Plane Wavefront Sensing algorithms.

scholarly journals Focal plane wavefront sensing and control strategies for high-contrast imaging on the MagAO-X instrument

2018 ◽  
Author(s):  
Kelsey L. Miller ◽  
Jared R. Males ◽  
Olivier Guyon ◽  
Laird M. Close ◽  
David S. Doelman ◽  
...  
Keyword(s):  
Focal Plane ◽  
Control Strategies ◽  
Wavefront Sensing ◽  
High Contrast ◽  
Contrast Imaging ◽  
High Contrast Imaging ◽  
Plane Wavefront ◽  
And Control

scholarly journals Focal Plane Wavefront Sensing with the FAST TGV Coronagraph

2020 ◽  
Vol 132 (1012) ◽  
pp. 064401
Author(s):  
Benjamin L. Gerard ◽  
Christian Marois
Keyword(s):  
Focal Plane ◽  
Wavefront Sensing ◽  
Plane Wavefront

scholarly journals Extremely fast focal-plane wavefront sensing for extreme adaptive optics

2012 ◽  
Author(s):  
Christoph U. Keller ◽  
Visa Korkiakoski ◽  
Niek Doelman ◽  
Rufus Fraanje ◽  
Raluca Andrei ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Focal Plane ◽  
Wavefront Sensing ◽  
Plane Wavefront

scholarly journals Focal-plane wavefront sensing with high-order adaptive optics systems

2014 ◽  
Author(s):  
Visa Korkiakoski ◽  
Christoph U. Keller ◽  
Niek Doelman ◽  
Matthew Kenworthy ◽  
Gilles Otten ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Focal Plane ◽  
High Order ◽  
Wavefront Sensing ◽  
Plane Wavefront

scholarly journals Fast focal plane wavefront sensing on ground-based telescopes

2018 ◽  
Author(s):  
Benjamin L. Gerard ◽  
Christian Marois ◽  
Jean-Pierre Véran ◽  
Raphaël Galicher
Keyword(s):  
Focal Plane ◽  
Wavefront Sensing ◽  
Plane Wavefront
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