The Space Coronagraph Optical Bench (SCoOB): 8. end-to-end numerical modeling of the testbed to estimate the contrast limits
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866918134929162240 |
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| author | Anche, Ramya M Van Gorkom, Kyle Milani, Kian Derby, Kevin Jenkins, Emory Ashcraft, Jaren Subramanian, Saraswathi Kalyani Ingraham, Patrick Kim, Daewook Choi, Heejoo Durney, Olivier Douglas, Ewan |
| author_facet | Anche, Ramya M Van Gorkom, Kyle Milani, Kian Derby, Kevin Jenkins, Emory Ashcraft, Jaren Subramanian, Saraswathi Kalyani Ingraham, Patrick Kim, Daewook Choi, Heejoo Durney, Olivier Douglas, Ewan |
| contents | The space coronagraph optical bench (SCoOB) at the University of Arizona is a high-contrast imaging testbed designed to operate in a vacuum to obtain a contrast better than 1e-8 in optical wavelengths using vector vortex coronagraph (VVC) masks. The testbed performance in a half-sided D-shaped dark hole is 2.2e-9 in a << 1% BW, 4e-9 in a 2% BW, and 2.5e-8 in a 15% BW. While the testbed has met the design specification contrast requirements in monochromatic wavelengths, comprehensive end-to-end numerical modeling to assess contrast limits across different bandpasses has yet to be conducted. In this work, we discuss the results of numerical modeling for the SCoOB testbed in both monochromatic and 10% bandwidths at 525 nm and 630 nm. This modeling incorporates measured VVC retardance, modeled polarization aberrations, measured surface and reflectivity errors, and diffuse and surface reflectivity. We explore and discuss the various factors contributing to the contrast limits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_02887 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Space Coronagraph Optical Bench (SCoOB): 8. end-to-end numerical modeling of the testbed to estimate the contrast limits Anche, Ramya M Van Gorkom, Kyle Milani, Kian Derby, Kevin Jenkins, Emory Ashcraft, Jaren Subramanian, Saraswathi Kalyani Ingraham, Patrick Kim, Daewook Choi, Heejoo Durney, Olivier Douglas, Ewan Instrumentation and Methods for Astrophysics The space coronagraph optical bench (SCoOB) at the University of Arizona is a high-contrast imaging testbed designed to operate in a vacuum to obtain a contrast better than 1e-8 in optical wavelengths using vector vortex coronagraph (VVC) masks. The testbed performance in a half-sided D-shaped dark hole is 2.2e-9 in a << 1% BW, 4e-9 in a 2% BW, and 2.5e-8 in a 15% BW. While the testbed has met the design specification contrast requirements in monochromatic wavelengths, comprehensive end-to-end numerical modeling to assess contrast limits across different bandpasses has yet to be conducted. In this work, we discuss the results of numerical modeling for the SCoOB testbed in both monochromatic and 10% bandwidths at 525 nm and 630 nm. This modeling incorporates measured VVC retardance, modeled polarization aberrations, measured surface and reflectivity errors, and diffuse and surface reflectivity. We explore and discuss the various factors contributing to the contrast limits. |
| title | The Space Coronagraph Optical Bench (SCoOB): 8. end-to-end numerical modeling of the testbed to estimate the contrast limits |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2509.02887 |