TY - GEN
T1 - Wavefront sensing using non-redundant aperture masking interferometry
T2 - Techniques and Instrumentation for Detection of Exoplanets X 2021
AU - Deo, V.
AU - Vievard, S.
AU - Cvetojevic, N.
AU - Norris, B.
AU - Guyon, O.
AU - Lozi, J.
AU - Ahn, K.
AU - Huby, E.
AU - Lacour, S.
AU - Martinache, F.
AU - Skaf, N.
AU - Tuthill, P.
N1 - Funding Information:
This work is based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. The authors also wish to acknowledge the critical importance of the current and recent Subaru Observatory daycrew, technicians, telescope operators, computer support, and office staff employees. Their expertise, ingenuity, and dedication is indispensable to the continued successful operation of these observatories. The development of SCExAO was supported by the Japan Society for the Promotion of Science (Grant-in-Aid for Research #23340051, #26220704, #23103002, #19H00703 & #19H00695), the Astrobiology Center of the National Institutes of Natural Sciences, Japan, the Mt Cuba Foundation and the director's contingency fund at Subaru Telescope. VD acknowledges support from NASA (Grant #80NSSC19K0336).
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PY - 2021
Y1 - 2021
N2 - Recent evolutions in high contrast imaging have shed light on intrinsic limitations of general purpose adaptive optics (AO) systems. In particular, the low wind and petaling effects (LWE, PE), caused by the discontinuous apertures of telescopes, are poorly corrected, if at all, by commonly used wavefront sensors (WFSs). This results in large differential piston aberrations between the disjointed portions of the clear aperture. The LWE/PE decoheres the PSF core, generating multiple side lobes, and dramatically shuts off coronagraphic capabilities. We demonstrate the re-purposing of non-redundant sparse aperture masking (SAM) interferometers into low-order WFSs complementing the high-order pyramid WFS, on the SCExAO experimental platform at Subaru Telescope. The SAM far-field interferograms are used for direct retrieval of PE aberrations, which are invisible to the main AO loop. We show that this technique allows for a high-sensitivity, high-precision wavefront control loop, down to illuminations of a few hundreds of photons per frame.
AB - Recent evolutions in high contrast imaging have shed light on intrinsic limitations of general purpose adaptive optics (AO) systems. In particular, the low wind and petaling effects (LWE, PE), caused by the discontinuous apertures of telescopes, are poorly corrected, if at all, by commonly used wavefront sensors (WFSs). This results in large differential piston aberrations between the disjointed portions of the clear aperture. The LWE/PE decoheres the PSF core, generating multiple side lobes, and dramatically shuts off coronagraphic capabilities. We demonstrate the re-purposing of non-redundant sparse aperture masking (SAM) interferometers into low-order WFSs complementing the high-order pyramid WFS, on the SCExAO experimental platform at Subaru Telescope. The SAM far-field interferograms are used for direct retrieval of PE aberrations, which are invisible to the main AO loop. We show that this technique allows for a high-sensitivity, high-precision wavefront control loop, down to illuminations of a few hundreds of photons per frame.
KW - Low wind effect
KW - Nonredundant masking
KW - Optical interferometry
KW - Sensor fusion
KW - Sparse aperture masking
KW - Wavefront sensing and control
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U2 - 10.1117/12.2594977
DO - 10.1117/12.2594977
M3 - Conference contribution
AN - SCOPUS:85116787458
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Techniques and Instrumentation for Detection of Exoplanets X
A2 - Shaklan, Stuart B.
A2 - Ruane, Garreth J.
PB - SPIE
Y2 - 1 August 2021 through 5 August 2021
ER -