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Sökning: WFRF:(Feldt Markus) > Uppsala universitet

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  • Carlomagno, Brunella, et al. (författare)
  • End-to-end simulations of the E-ELT/METIS coronagraphs
  • 2016
  • Ingår i: Adaptive Optics Systems V. - : SPIE - International Society for Optical Engineering. ; , s. 1-10
  • Konferensbidrag (refereegranskat)abstract
    • The direct detection of low-mass planets in the habitable zone of nearby stars is an important science case for future E-ELT instruments such as the mid-infrared imager and spectrograph METIS, which features vortex phase masks and apodizing phase plates (APP) in its baseline design. In this work, we present end-to-end performance simulations, using Fourier propagation, of several METIS coronagraphic modes, including focal-plane vortex phase masks and pupil-plane apodizing phase plates, for the centrally obscured, segmented E-ELT pupil. The atmosphere and the AO contributions are taken into account. Hybrid coronagraphs combining the advantages of vortex phase masks and APPs are considered to improve the METIS coronagraphic performance.
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  • Carlomagno, Brunella, et al. (författare)
  • Performance evaluation of mid-IR vortex coronagraphs with centrally obscured segmented pupils
  • 2015
  • Konferensbidrag (refereegranskat)abstract
    • In its original design, the E-ELT/Metis instrument envisages a vortex coronagraph in the mid-IR regime for detection and characterization of exoplanets, with a contrast of 1e-4 at 2 lambda/D (~40 mas in L band). The AGPM (Annular Groove Phase Mask) is a vortex phase mask with impressive characteristics: small inner working angle, high throughput, achromaticity. A non-perfectly circular pupil and non-flat input wavefront result in a starlight leakage, degrading the performance of the vortex coronagraph. In this work, we present end-to-end performance simulations using Fourier optical propagation to determine the quality of the starlight rejection obtained with an infrared vortex coronagraph. We first analyse the performance facing E-ELT pupil variations (segmentations, central obscuration, spiders, missing segments), then pointing jitter and random adaptive optics residual phase screens are introduced to derive more realistic performance. Finally, more advanced concepts of the infrared vortex coronagraph are presented, in order to compensate for performance degradation.
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  • Resultat 1-3 av 3

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