The multi-conjugate adaptive optics system of the New Solar Telescope at Big Bear Solar Observatory

Schmidt, Dirk; Gorceix, Nicolas; Zhang, Xianyu; Mariño, José María Solé; Coulter, R.; Shumko, S.; Goode, Philip R.; Rimmelé, Thomas; Berkefeld, Thomas

doi:10.1117/12.2055146

Cited by 11 publications

(4 citation statements)

References 13 publications

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“…Many of the second-generation astronomical adaptive optics systems are pushing toward larger corrected fields of view. Multi-conjugate adaptive optics (MCAO) systems such as Gemini's GEMS [1], ESO's MAD demonstrator [2], and the solar MCAO systems at the Dunn [3], GREGOR [4], and Big Bear [5] solar telescopes seek to achieve corrected images with modest Strehl ratios over roughly one arcminute fields of view. Multi-object adaptive optics (MOAO) demonstrator systems such as CANARY [6] and Raven [7] look to extend these corrections to several small "single-object" fields distributed within a field of a few arcminutes.…”

Section: Introductionmentioning

confidence: 99%

Imaka: a ground-layer adaptive optics system on Maunakea

Chun

Lai

Toomey

et al. 2016

Adaptive Optics Systems V

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We present the integration status for `imaka, the ground-layer adaptive optics (GLAO) system on the University of Hawaii 2.2-meter telescope on Maunakea, Hawaii. This wide-field GLAO pathfinder system exploits Maunakea's highly confined ground layer and weak free-atmosphere to push the corrected field of view to ~1/3 of a degree, an areal field approaching an order of magnitude larger than any existing or planned GLAO system, with a FWHM ~ 0.33" in the visible and near infrared. We discuss the unique design aspects of the instrument, the driving science cases and how they impact the system, and how we will demonstrate these cases on the sky.

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Section: Introductionmentioning

confidence: 99%

Imaka: a ground-layer adaptive optics system on Maunakea

Chun

Lai

Toomey

et al. 2016

Adaptive Optics Systems V

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“…As a result, there is no routine operational solar MCAO available now, although progresses are being made for solar MCAO developments. [11][12][13] In this publication, we propose a pupil-transformation MCAO (PT-MCAO) for solar high-resolution imaging over a large FOV. Our PT-MCAO uses a similar hardware configuration with that of the star-oriented MCAO.…”

Section: Introductionmentioning

confidence: 99%

Pupil-transformation multiconjugate adaptive optics for solar high-resolution imaging

et al. 2016

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Abstract. We propose a multiconjugate adaptive optics (MCAO) system called pupil-transformation MCAO (PT-MCAO) for solar high-angular resolution imaging over a large field of view. The PT-MCAO, consisting of two deformable mirrors (DMs), uses a Shack-Hartmann wavefront sensor located on the telescope pupil to measure the wavefront slopes from several guide stars. The average slopes are used to control the first DM conjugated on the telescope aperture by a solar ground-layer adaptive optics (AO) approach while the remaining slopes are used to control the second DM conjugated on a high altitude by a conventional solar AO via a geometric PT. The PT-MCAO uses a similar hardware configuration as the conventional star-oriented MCAO. However, a distinctive feature of our PT-MCAO is that it avoids the construction of tomography wavefront, which is a time-consuming and complex process for the solar real-time atmospheric turbulence correction. For the PT-MCAO, current widely used and fully understood conventional solar AO closed-loop control algorithms can be directly used to control the two DMs, which greatly reduces the real-time calculation power requirement and makes the PT-MCAO easy to implement. In this publication, we discuss the PT-MCAO methodology, its unique features, and compare its performance with that of the conventional solar star-oriented MCAO systems, which demonstrate that the PT-MCAO can be immediately used for solar high-resolution imaging.

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“…The MCAO systems that are currently being developed for the 1.6-m NST and the 1.5-m GREGOR or the future 4-m Daniel K Inouye Solar Telescope (DKIST) and European Solar Telescope (EST) target for a 60″ ∼ 80″ corrected imaging FOV in the visible wavelength range Rimmele & Marino 2011;Schmidt et al 2014). Theoretical simulation of the future EST MCAO system using 5 DMs and 19 guide stars at seeing r 0 ¼ 15 cm for zenith angle = 0°shows that Strehl ratios on the range of 0:2 ∼ 0:59 can be achieved in a FOV of 60″ diameter, at the 0:5-μm visible wavelength .…”

Section: Introductionmentioning

confidence: 99%

Solar Ground-Layer Adaptive Optics

Ren¹,

Jolissaint²,

Zhang³

et al. 2015

Publications of the Astronomical Society of the Pacific

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ABSTRACT. Solar conventional adaptive optics (CAO) with one deformable-mirror uses a small field-of-view (FOV) for wave-front sensing, which yields a small corrected FOV for high-resolution imaging. Solar activities occur in a two-dimensional extended FOV and studies of solar magnetic fields need high-resolution imaging over a FOV at least 60″. Recently, solar Tomography Adaptive Optics (TAO) and Multi-Conjugate Adaptive Optics (MCAO) were being developed to overcome this problem of small AO corrected FOV. However, for both TAO and MCAO, wavefront distortions need to be tomographically reconstructed from measurements on multiple guide stars, which is a complicated and time-consuming process. Solar Ground-Layer Adaptive Optics (S-GLAO) uses one or several guide stars, and does not rely on a tomographic reconstruction of the atmospheric turbulence. In this publication, we present two unique wavefront sensing approaches for the S-GLAO. We show that our S-GLAO can deliver good to excellent performance at variable seeing conditions in the Near Infrared (NIR) J and H bands, and is much simpler to implement. We discuss details of our S-GLAO associated wavefront approaches, which make our S-GLAO a unique solution for sunspot high-resolution imaging that other current adaptive optics systems, including the solar MCAO, cannot offer.

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The multi-conjugate adaptive optics system of the New Solar Telescope at Big Bear Solar Observatory

Cited by 11 publications

References 13 publications

Imaka: a ground-layer adaptive optics system on Maunakea

Imaka: a ground-layer adaptive optics system on Maunakea

Pupil-transformation multiconjugate adaptive optics for solar high-resolution imaging

Solar Ground-Layer Adaptive Optics

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