DOI | Resolve DOI: https://doi.org/10.1117/12.926575 |
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Author | Search for: Baudoz, P.; Search for: Mazoyer, J.; Search for: Mas, M.; Search for: Galicher, R.1; Search for: Rousset, G. |
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Affiliation | - National Research Council of Canada. NRC Herzberg Institute of Astrophysics
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Format | Text, Article |
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Conference | Ground-Based and Airborne Instrumentation for Astronomy IV, July 1-6, 2012, Amsterdam, The Netherlands |
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Subject | Active correction; Angular separation; Coronagraph; Coronagraphy; Deformable mirrors; Direct imaging; Exoplanet; Extra solar planets; Extremely Large Telescopes; Focal Plane; Ground based; High contrast; High contrast imaging; Near-IR; Optical defects; Planet detection; Planet finders; Post processing; Reference image; Scientific applications; Speckle noise; Wavefront correction; Wavefront quality; Astronomy; Cameras; Laser pulses; Optical telescopes; Image processing |
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Abstract | Direct imaging and low-resolution spectroscopy of extrasolar planets are exciting but challenging scientific applications of coronagraphy. While the angular separation is well within the reach of actual telescope in the near IR or visible, the planet-star contrast (from 10-6 to 10-10) requires wavefront quality and stability hard to reach even with a well-polished space telescope. Several solutions have been proposed to tackle the speckle noise introduced by the residual optical defects. While some concepts rely only on active wavefront correction using deformable mirror, other techniques are based on post-processing and subtract a reference image recorded sometimes simultaneously with the science image. One interesting solution is to choose a concept that allows both active correction and post-processing of high contrast coronagraphic images. This is the case of the Self Coherent Camera (SCC), which has been proposed for the project of space coronagraph SPICES and for the ground-based planet finder EPICS studied for the European Extremely Large Telescope. After recalling the SCC principle, we present both monochromatic and modest bandwidth (2%) experimental results of Dark Hole in the focal plane using a SCC. Example of a post-processing result with SCC is also given to emphasize the interest of combining it with active correction. © 2012 SPIE. |
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Publication date | 2012 |
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Publisher | SPIE |
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In | |
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Series | |
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Language | English |
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Peer reviewed | Yes |
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NPARC number | 21269441 |
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Export citation | Export as RIS |
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Report a correction | Report a correction (opens in a new tab) |
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Record identifier | ab950adc-e29e-47d4-bd1a-4a6c6f170b2a |
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Record created | 2013-12-12 |
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Record modified | 2020-04-21 |
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