Instrumentation, Techniques, and Measurement

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

[+] Author Affiliations
Deqing Ren, Robert Broadfoot, Julius Chapman

California State University Northridge, Physics and Astronomy Department, 18111 Nordhoff Street, Northridge, California 91330, United States

Xi Zhang, Jiangpei Dou, Yongtian Zhu

Chinese Academy of Sciences, National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology, Nanjing 210042, China

Chinese Academy of Sciences, Nanjing Institute of Astronomical Optics and Technology, Key Laboratory of Astronomical Optics and Technology, Nanjing 210042, China

Opt. Eng. 55(9), 094103 (Sep 20, 2016). doi:10.1117/1.OE.55.9.094103
History: Received June 26, 2016; Accepted August 30, 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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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Deqing Ren ; Xi Zhang ; Jiangpei Dou ; Yongtian Zhu ; Robert Broadfoot, et al.
"Pupil-transformation multiconjugate adaptive optics for solar high-resolution imaging", Opt. Eng. 55(9), 094103 (Sep 20, 2016). ; http://dx.doi.org/10.1117/1.OE.55.9.094103


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Isoplanatism in a multiconjugate adaptive optics system. J Opt Soc Am A Opt Image Sci Vis 2000;17(10):1819-27.
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