Evaluating the end-to-end performance of TPF-C with vector propagation models: Part I. Pupil mask effects

Lieber, Mike; Neureuther, Andrew R.; Ceperley, Dan; Kasdin, Jeremy; Hoppe, Dan; Eisenman, Allan Read

doi:10.1117/12.615589

Cited by 4 publications

(3 citation statements)

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“…PROPER also does not capture the electromagnetic interaction of the field with conducting materials that would require elaborate vector propagation calculations. A limited set of such calculations were done for the Terrestrial Planet Finder Coronagraph project, notably for the shaped pupil masks that had very narrow, sharp openings 21 . Based on those experiences, aperture-related vector effects are not expected to be significant in the AFTA coronagraphs considered here, though the variation in polarization-dependent Fresnel reflection coefficient effects due to angle of incidence is included using ray tracing software outside of PROPER.…”

Section: Propagation and Modelling Softwarementioning

confidence: 99%

Numerical modeling of the proposed WFIRST-AFTA coronagraphs and their predicted performances

Krist

Nemati

Mennesson

2015

J. Astron. Telesc. Instrum. Syst

100

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The WFIRST-AFTA 2.4 m telescope will provide in the next decade the opportunity to host a coronagraph for the imaging and spectroscopy of planets and disks. The telescope, however, is not ideal, given its obscured aperture. Only recently have coronagraph designs been thoroughly investigated that can efficiently work with this configuration. Three coronagraph designs, the hybrid Lyot, the shaped pupil, and the phase-induced amplitude-apodization complex mask coronagraph (PIAA-CMC) have been selected for further development by the AFTA project. Real-world testbed demonstrations of these have just begun, so for now the most reliable means of evaluating their potential performance comes from numerical modeling incorporating diffraction propagation, realistic system models, and simulated wavefront sensing and control. Here we present the methods of performance evaluation and results for the current coronagraph designs.

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Section: Propagation and Modelling Softwarementioning

confidence: 99%

Numerical modeling of the proposed WFIRST-AFTA coronagraphs and their predicted performances

Krist

Nemati

Mennesson

2015

J. Astron. Telesc. Instrum. Syst

100

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“…3 An improved method based on precise measurements of numerical propagation parameters was introduced that allowed the retrieval of phase as well as amplitude information about stray-light sources. Using these improved methods a number of physical phenomena were investigated.…”

Section: Resultsmentioning

confidence: 99%

Characterizing edge-generated stray light sources for TPF Coronagraph pupil masks

Ceperley

Neureuther

Lieber

et al. 2005

Techniques and Instrumentation for Detection of Exoplanets II

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The edge generated stray-light from corner boundary conditions, interactions with the lower mask structure, and surface plasmon polaritons that may limit Terrestrial Planet Finder Coronagraph performance are characterized. Previously a number of stray light sources, unaccounted for by the ideal thin mask theory used to design the pupil-plane masks, were identified. 1 In this paper we illustrate and quantify the most important outstanding stray-light sources in the near-field in order to improve the model of pupil-plane mask transmission used by the Integrated Telescope Model. 2 Corner spikes, caused by the need to bring the ideal top-hat field into compliance with the boundary conditions set forth by Maxwell's equations, form the strongest source of stray-light, accounting for up to a 1λ shift in the effective opening width per edge. Undercutting mask edges by 20 • reduces this source of stray-light by more than a factor of five. Interactions between light and the lower mask structure, a secondary effect, account for only a few percent of the stray-light in the TE polarization but account for up to 50% of the stray-light in the TM polarization due to surface plasmon polaritons. Surface plasmon polaritons, surface waves that run for tens of microns and radiate at corners, form the final stray-light source. On thin masks they may account for up to a 1λ shift in the effective opening width; however, their effects can be easily mitigated by choosing a poor surface plasmon material, such as Chrome. The results presented here are being used to facilitate end-to-end system modeling through the Integrated Telescope Model. 3

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“…Fortunately, for most cases of interest, these assumptions are indeed valid. Ceperley et al [10] have performed finite-difference-time-domain simulations of the interactions between the vector electromagnetic fields and the edges of a realistic mask, and Lieber et al [11] have used those results to study the effects on the final contrast. Both studies concluded that any corrupting field effects are below the desired level provided that the mask has tapered rathered than perpendicular edges.…”

Section: Manufacturingmentioning

confidence: 99%

Shaped pupil coronagraphy

Kasdin

Vanderbei

Belikov

2007

Comptes Rendus. Physique

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At Princeton we have been studying shaped pupil coronagraphs for high contrast imaging and planet finding. These will find applications in both ground and space imaging. In this article we summarize the design procedure for shaped pupils and review the various families of designs we have found. We describe the manufacturing processes we have used to make free standing shaped pupil masks and review our most recent laboratory results with and without wavefront control. We also discuss the factors limiting high contrast in the laboratory and our plans for mitigating them. RésuméCoronographie à pupille binaires. Notre groupe à Princeton se focalise sur l'étude de coronographes à pupille binaires dans le contexte de l'imagerie à très haut contraste et de la détection d'exo-planètes. Nous étudions en parallèle leur application à des projets spatiaux et à des telescopes conventionnels. Dans cet article, nous introduisons la théorie nécessaire à la conception de tels masques, puis passons en revue différentes familles de diaphragmes capables de produire un contraste de 10 ordres de grandeur.

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Evaluating the end-to-end performance of TPF-C with vector propagation models: Part I. Pupil mask effects

Cited by 4 publications

References 0 publications

Numerical modeling of the proposed WFIRST-AFTA coronagraphs and their predicted performances

Numerical modeling of the proposed WFIRST-AFTA coronagraphs and their predicted performances

Characterizing edge-generated stray light sources for TPF Coronagraph pupil masks

Shaped pupil coronagraphy

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