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Proceedings Paper

Development of adaptive optics elements for solar telescope
Author(s): V. P. Lukin; V. M. Grigor'ev; L. V. Antoshkin; N. N. Botugina; P. G. Kovadlo; P. A. Konyaev; E. A. Kopulov; V. I. Skomorovsky; V. D. Trifonov; S. A. Chuprakov
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Paper Abstract

The devices and components of adaptive optical system ANGARA, which is developed for image correction in the Big solar vacuum telescope (BSVT) at Baykal astrophysical observatory are described. It is shown that the use of modernized adaptive system on BSVT not only reduces the turbulent atmospheric distortions of image, but also gives a possibility to improve the telescope developing new methods of solar observations. A high precision Shack-Hartmann wavefront (WF) sensor has been developed on the basis of a low-aperture off-axis diffraction lens array. The device is capable of measuring WF slopes at array sub-apertures of size 640X640 μm with an error not exceeding 4.80 arc.sec. Also the modification of this sensor for adaptive system of solar telescope using extended scenes as tracking objects, such as sunspot, pores, solar granulation and limb, is presented. The software package developed for the proposed WF sensors includes three algorithms of local WF slopes estimation (modified centroids, normalized cross-correlation and fast Fourier-demodulation), as well as three methods of WF reconstruction (modal Zernike polynomials expansion, deformable mirror response functions expansion and phase unwrapping), that can be selected during operation with accordance to the application.

Paper Details

Date Published: 13 September 2012
PDF: 8 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 84476E (13 September 2012); doi: 10.1117/12.925594
Show Author Affiliations
V. P. Lukin, V.E. Zuev Institute of Atmospheric Optics (Russian Federation)
V. M. Grigor'ev, Institute of Solar-Terrestrial Physics (Russian Federation)
L. V. Antoshkin, V.E. Zuev Institute of Atmospheric Optics (Russian Federation)
N. N. Botugina, V.E. Zuev Institute of Atmospheric Optics (Russian Federation)
P. G. Kovadlo, Institute of Solar-Terrestrial Physics (Russian Federation)
P. A. Konyaev, V.E. Zuev Institute of Atmospheric Optics (Russian Federation)
E. A. Kopulov, V.E. Zuev Institute of Atmospheric Optics (Russian Federation)
V. I. Skomorovsky, Institute of Solar-Terrestrial Physics (Russian Federation)
V. D. Trifonov, Institute of Solar-Terrestrial Physics (Russian Federation)
S. A. Chuprakov, Institute of Solar-Terrestrial Physics (Russian Federation)


Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)

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