Prototyping liquid-crystal coronagraphs for exo-Earth imaging
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866913439194021888 |
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| author | Laginja, Iva Doelman, David Snik, Frans Baudoz, Pierre Bettonvil, Felix Rietjens, Jeroen H. van Dijk, Chris N. Peeters, Kristien Eigenraam, Alexander Pougheon, Erin van der Wielen, Tom Esposito, Marco Wijnen, Thomas Krasteva, Mariya Taccola, Matteo |
| author_facet | Laginja, Iva Doelman, David Snik, Frans Baudoz, Pierre Bettonvil, Felix Rietjens, Jeroen H. van Dijk, Chris N. Peeters, Kristien Eigenraam, Alexander Pougheon, Erin van der Wielen, Tom Esposito, Marco Wijnen, Thomas Krasteva, Mariya Taccola, Matteo |
| contents | This paper presents initial results from the ESA-funded ``SUPPPPRESS'' project, which aims to develop high-performance liquid-crystal coronagraphs for direct imaging of Earth-like exoplanets in reflected light. The project focuses on addressing the significant challenge of polarization leakage in vector vortex coronagraphs (VVCs). We utilize newly manufactured multi-grating, liquid-crystal VVCs, consisting of a two- or three-element stack of vortex and grating patterns, to reduce this leakage to the $10^{-10}$ contrast level. We detail the experimental setups, including calibration techniques with polarization microscopes and Mueller matrix ellipsometers to enhance the direct-write accuracy of the liquid-crystal patterns. The performance testing of these coronagraph masks will be conducted on the THD2 high-contrast imaging testbed in Paris. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_14723 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Prototyping liquid-crystal coronagraphs for exo-Earth imaging Laginja, Iva Doelman, David Snik, Frans Baudoz, Pierre Bettonvil, Felix Rietjens, Jeroen H. van Dijk, Chris N. Peeters, Kristien Eigenraam, Alexander Pougheon, Erin van der Wielen, Tom Esposito, Marco Wijnen, Thomas Krasteva, Mariya Taccola, Matteo Instrumentation and Methods for Astrophysics This paper presents initial results from the ESA-funded ``SUPPPPRESS'' project, which aims to develop high-performance liquid-crystal coronagraphs for direct imaging of Earth-like exoplanets in reflected light. The project focuses on addressing the significant challenge of polarization leakage in vector vortex coronagraphs (VVCs). We utilize newly manufactured multi-grating, liquid-crystal VVCs, consisting of a two- or three-element stack of vortex and grating patterns, to reduce this leakage to the $10^{-10}$ contrast level. We detail the experimental setups, including calibration techniques with polarization microscopes and Mueller matrix ellipsometers to enhance the direct-write accuracy of the liquid-crystal patterns. The performance testing of these coronagraph masks will be conducted on the THD2 high-contrast imaging testbed in Paris. |
| title | Prototyping liquid-crystal coronagraphs for exo-Earth imaging |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2407.14723 |