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29 August 2022 Interferometric wavefront sensing at FIRST/SCExAO : self-calibrated fibered pupil-remapping spectrocopy using a metrology laser source
Sébastien B. Vievard, Vincent Deo, Elsa Huby, Sylvestre Lacour, Olivier Guyon, Nick Cvetojevic, Kevin Barjot, Guillermo Martin, Manon Lallement, Julien Lozi, Takayuki Kotani, Franck Marchis, Daniel Rouan, Kyohoon Ahn, Nour Skaf, Guy Perrin
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Proceedings Volume 12183, Optical and Infrared Interferometry and Imaging VIII; 121830R (2022) https://doi.org/10.1117/12.2629299
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada
Abstract
FIRST is a post Extreme Adaptive-Optics (ExAO) spectro-interferometer based on pupil remapping using single-mode fibers. Installed on the SCExAO platform at the Subaru Telescope, it operates in the Visible (600-800nm, R 400) and demonstrated companion detection below the telescope diffraction limit. As an interferometric device, FIRST is sensitive to phasing problems in the telescope pupil. This is particularly interesting to measure discontinuous aberrations, invisible to the ExAO sensors. Recent developments aimed to measure upstream aberrations directly from the same interferometric signal used for scientific data analysis. A key limitation to this new capability is the fiber thermal and mechanical instabilities, inducing up to 1 micron drift over a few seconds. We propose to use a metrology laser source, allowing to discriminate FIRST instrumental effects from all the upstream aberrations. We present the integration of this setup and the on-sky demonstration of the method.
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Sébastien B. Vievard, Vincent Deo, Elsa Huby, Sylvestre Lacour, Olivier Guyon, Nick Cvetojevic, Kevin Barjot, Guillermo Martin, Manon Lallement, Julien Lozi, Takayuki Kotani, Franck Marchis, Daniel Rouan, Kyohoon Ahn, Nour Skaf, and Guy Perrin "Interferometric wavefront sensing at FIRST/SCExAO : self-calibrated fibered pupil-remapping spectrocopy using a metrology laser source", Proc. SPIE 12183, Optical and Infrared Interferometry and Imaging VIII, 121830R (29 August 2022); https://doi.org/10.1117/12.2629299
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KEYWORDS
Interferometry
Wavefront sensors
Telescopes
Calibration
Laser sources
Metrology
Coronagraphy
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