ON-SKY PERFORMANCE ANALYSIS OF THE VECTOR APODIZING PHASE PLATE CORONAGRAPH ON MagAO/Clio2

Otten, G. P. P. L.; Snik, Frans; Kenworthy, Matthew A.; Keller, Christoph U.; Males, Jared R.; Morzinski, Katie M.; Close, Laird M.; Codona, Johanan L.; Hinz, Philip M.; Hornburg, Kathryn J.; Brickson, Leandra; Escuti, Michael J.

doi:10.3847/1538-4357/834/2/175

Cited by 79 publications

(82 citation statements)

References 52 publications

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“…The sheer simplicity of the optical layout of pupilplane coronagraphs has led to their widespread use in high-contrast imaging instruments (Otten et al 2017;Doelman et al 2017;Currie et al 2018). However this simple optical layout also implies worse performance compared to coronagraphs with a more complicated optical layout, due to their more limited design freedom.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

Phase-apodized-pupil Lyot Coronagraphs for Arbitrary Telescope Pupils

Por

2020

ApJ

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“…Once the NCPAs are under control, it is possible to imagine moving toward coronagraphs optimized for small IWA. Here again there are many different possibilities that all present their respective advantages and drawbacks in terms of IWA, band-pass, manufacturing, polarimetric requirements, etc (e.g., Guyon 2003;Mawet et al 2005Mawet et al , 2009Kenworthy et al 2010;Snik et al 2012;Carlotti 2013;Mawet et al 2013;N'Diaye et al 2016a;Otten et al 2017;N'Diaye et al 2018). A careful tradeoff study will be required to ensure an important gain in contrast while maintaining some of the unique features of SPHERE.…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

SPHERE: the exoplanet imager for the Very Large Telescope

Beuzit

Vigan

Mouillet

et al. 2019

A&A

493

169

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Observations of circumstellar environments that look for the direct signal of exoplanets and the scattered light from disks have significant instrumental implications. In the past 15 years, major developments in adaptive optics, coronagraphy, optical manufacturing, wavefront sensing, and data processing, together with a consistent global system analysis have brought about a new generation of high-contrast imagers and spectrographs on large ground-based telescopes with much better performance. One of the most productive imagers is the Spectro-Polarimetic High contrast imager for Exoplanets REsearch (SPHERE), which was designed and built for the ESO Very Large Telescope (VLT) in Chile. SPHERE includes an extreme adaptive optics system, a highly stable common path interface, several types of coronagraphs, and three science instruments. Two of them, the Integral Field Spectrograph (IFS) and the Infra-Red Dual-band Imager and Spectrograph (IRDIS), were designed to efficiently cover the near-infrared (NIR) range in a single observation for an efficient search of young planets. The third instrument, ZIMPOL, was designed for visible (VIS) polarimetric observation to look for the reflected light of exoplanets and the light scattered by debris disks. These three scientific instruments enable the study of circumstellar environments at unprecedented angular resolution, both in the visible and the near-infrared. In this work, we thoroughly present SPHERE and its on-sky performance after four years of operations at the VLT.

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“…Furthermore, the liquid crystals have also been shown to operate in cryogenic environments. 23 The requirements for the QWP are much tighter and cannot benefit from the double-grating technique. However, there is a broader choice of materials available as the fast axis orientation constant within the optic.…”

Section: Requirements Leakagementioning

confidence: 99%

Fully broadband vAPP coronagraphs enabling polarimetric high contrast imaging

Bos¹,

Doelman²,

Boer³

et al. 2018

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III

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We present designs for fully achromatic vector Apodizing Phase Plate (vAPP) coronagraphs, that implement low polarization leakage solutions and achromatic beam-splitting, enabling observations in broadband filters. The vAPP is a pupil plane optic, inducing the phase through the inherently achromatic geometric phase. We discuss various implementations of the broadband vAPP and set requirements on all the components of the broadband vAPP coronagraph to ensure that the leakage terms do not limit a raw contrast of 10 −5 . Furthermore, we discuss superachromatic QWPs based of liquid crystals or quartz/MgF2 combinations, and several polarizer choices. As the implementation of the (broadband) vAPP coronagraph is fully based on polarization techniques, it can easily be extended to furnish polarimetry by adding another QWP before the coronagraph optic, which further enhances the contrast between the star and a polarized companion in reflected light. We outline several polarimetric vAPP system designs that could be easily implemented in existing instruments, e.g. SPHERE and SCExAO.

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ON-SKY PERFORMANCE ANALYSIS OF THE VECTOR APODIZING PHASE PLATE CORONAGRAPH ON MagAO/Clio2

Cited by 79 publications

References 52 publications

Phase-apodized-pupil Lyot Coronagraphs for Arbitrary Telescope Pupils

Phase-apodized-pupil Lyot Coronagraphs for Arbitrary Telescope Pupils

SPHERE: the exoplanet imager for the Very Large Telescope

Fully broadband vAPP coronagraphs enabling polarimetric high contrast imaging

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