High Contrast Imaging for Python (HCIPy): an open-source adaptive optics and coronagraph simulator

Por, Emiel H.; Haffert, Sebastiaan Y.; Radhakrishnan, Vikram M.; Doelman, David; Kooten, Maaike A. M. van; Bos, Steven P.

doi:10.1117/12.2314407

Cited by 100 publications

(65 citation statements)

References 33 publications

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“…of this method is available in the open-source package HCIPy (Por et al 2018). We show some examples in Figure 5.…”

Section: Parameter Study For One-sided Dark Zonesmentioning

confidence: 99%

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Phase-apodized-pupil Lyot Coronagraphs for Arbitrary Telescope Pupils

Por

2020

ApJ

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The phase-apodized-pupil Lyot coronagraph (PAPLC) is a pairing of the apodized-pupil Lyot coronagraph (APLC) and the apodizing phase plate (APP) coronagraph. We describe a numerical optimization method to obtain globally-optimal solutions for the phase apodizers for arbitrary telescope pupils, based on the linear map between complex-amplitude transmission of the apodizer and the electric field in the post-coronagraphic focal plane. PAPLCs with annular focal-plane masks and point-symmetric dark zones perform analogous to their corresponding APLCs. However with a knife-edge focal-plane mask and one-sided dark zones, the PAPLC yields inner working angles as close as 1.4λ/D at contrasts of 10 −10 and maximum post-coronagraphic throughput of > 75% for telescope apertures with central obscurations of up to 30%. We present knife-edge PAPLC designs optimized for the VLT/SPHERE instrument and the LUVOIR-A aperture. These designs show that the knife-edge PAPLC retains its performance, even for realistic telescope pupils with struts, segments and non-circular outer edges.

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“…of this method is available in the open-source package HCIPy (Por et al 2018). We show some examples in Figure 5.…”

Section: Parameter Study For One-sided Dark Zonesmentioning

confidence: 99%

“…This research made use of HCIPy, an open-source object-oriented framework written in Python for performing end-to-end simulations of high-contrast imaging instruments (Por et al 2018). Additionally we used the numerical library NumPy (Walt et al 2011) and visualizations were made using the library Matplotlib (Hunter 2007).…”

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confidence: 99%

Phase-apodized-pupil Lyot Coronagraphs for Arbitrary Telescope Pupils

Por

2020

ApJ

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“…We then Fraunhofer propagate these electric fields to the focal plane and compute the intensity using hcipy. 18 We create an ideal point spread function (PSF) by Fraunhofer propagating a clear aperture matching the shape of the valid DM actuators. We simulate the effect of an ideal coronagraph by subtracting this ideal PSF from the non-predictive and predictive PSFs.…”

Section: Synthetic Contrast Curvementioning

confidence: 99%

Demonstrating predictive wavefront control with the Keck II near-infrared pyramid wavefront sensor

Jensen-Clem

Bond

Cetre

et al. 2019

Techniques and Instrumentation for Detection of Exoplanets IX

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The success of ground-based instruments for high contrast exoplanet imaging depends on the degree to which adaptive optics (AO) systems can mitigate atmospheric turbulence. While modern AO systems typically suffer from millisecond time lags between wavefront measurement and control, predictive wavefront control (pWFC) is a means of compensating for those time lags using previous wavefront measurements, thereby improving the raw contrast in the post-coronagraphic science focal plane. A method of predictive control based on Empirical Orthogonal Functions (EOF) has previously been proposed and demonstrated on Subaru/SCExAO. In this paper we present initial tests of this method for application to the near-infrared pyramid wavefront sensor (PYWFS) recently installed in the Keck II AO system. We demonstrate the expected root-mean-square (RMS) wavefront error and contrast benefits of pWFC based on simulations, applying pWFC to on-sky telemetry data saved during commissioning of the PYWFS. We discuss how the performance varies as different temporal and spatial scales are included in the computation of the predictive filter. We further describe the implementation of EOF pWFC within the PYWFS dedicated real-time controller (RTC), and, via daytime testing at the observatory, we demonstrate the performance of pWFC in real time when pre-computed phase screens are applied to the deformable mirror (DM).

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“…13. For comparison, we simulate the PSF of a single aperture over 12% bandwidth using HCIPy (Por et al, 2018). The simulations visually match the on-sky data apart from the AO residuals (mostly wind-driven halo) and low-order aberrations.…”

Section: Experimental Results For a Double-grating Vector Vortex Coromentioning

confidence: 99%

“…ERC Starting Grant 678194 (FALCONER); thank our all our collaborators from the LBT for helping us acquire the first on-sky results with the double-grating vAPP, especially Phil Hinz, Steve Ertel, Jordan Stone, and Eckhart Arthur Spalding. This research made use of HCIPy (Por et al, 2018), an open-source object-oriented framework written in Python for performing end-to-end simulations of high-contrast imaging instruments. We thank Christoph Keller for the many fruitful discussions, which helped improve the results presented in this work.…”

Section: Fundingmentioning

confidence: 99%

Minimizing the Polarization Leakage of Geometric-phase Coronagraphs with Multiple Grating Pattern Combinations

Doelman

Por

Ruane

et al. 2020

PASP

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The design of liquid-crystal diffractive phase plate coronagraphs for groundbased and space-based high-contrast imaging systems is limited by the trade-off between spectral bandwidth and polarization leakage. We demonstrate that by combining phase patterns with a polarization grating (PG) pattern directly followed by one or several separate PGs, we can suppress the polarization leakage terms by additional orders of magnitude by diffracting them out of the beam. Using two PGs composed of a single-layer liquid crystal structure in the lab, we demonstrate a leakage suppression of more than an order of magnitude over a bandwidth of 133 nm centered around 532 nm. At this center wavelength we measure a leakage suppression of three orders of magnitude. Furthermore, simulations indicate that a combination of two multi-layered liquid-crystal PGs can suppress leakage to < 10 −5 for 1-2.5 µm and < 10 −10 for 650-800 nm. We introduce multi-grating solutions with three or more gratings that can be designed to have no separation of the two circular polarization states, and offer even deeper suppression of polarization leakage. We present simulations of a triple-grating solution that has < 10 −10 leakage on the first Airy ring from 450 nm to 800 nm. We apply the double-grating concept to the Vector-Vortex coronagraph of charge 4, and demonstrate in the lab that polarization leakage no longer limits the on-axis suppression for ground-based contrast levels. Lastly, we report on the successful installation and first-light results of a double-grating vector Apodizing Phase Plate pupil-plane coronagraph installed at the Large Binocular Telescope. We discuss the implications of these new coronagraph architectures for high-contrast imaging systems on the ground and in space.

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High Contrast Imaging for Python (HCIPy): an open-source adaptive optics and coronagraph simulator

Cited by 100 publications

References 33 publications

Phase-apodized-pupil Lyot Coronagraphs for Arbitrary Telescope Pupils

Phase-apodized-pupil Lyot Coronagraphs for Arbitrary Telescope Pupils

Demonstrating predictive wavefront control with the Keck II near-infrared pyramid wavefront sensor

Minimizing the Polarization Leakage of Geometric-phase Coronagraphs with Multiple Grating Pattern Combinations

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